Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Contents DEFINITIONS AND ABBREVIATIONS 2 Table 1: 132/33 kV 23 MVA Power Transformers and On-Load Tap Changer 4 Table 2: 132/33 kV 10 MVA Power Transformer – On load Tap changer 11 Table 3: 132/33 kV 15 MVA Power Transformer and On load Tap changer 16 Table 5: 132 kV Circuit Breaker 21 Table 6: 132 kV Isolators with Earthing Switches 25 Table 8: 33kV Outdoor Circuit Breaker 27 Table 9: 33 kV Isolators with Earthing Switches 30 Table 10: 132 kV Voltage Transformer 33 Table 11: 132kV Current Transformer 35 Table 12: 132kV Surge Arresters 38 Table 14:33kV Surge Arresters 42 Table 15:Busbar Conductor ACSR 435/55 mm² 44 Table 16: Busbar Shield Wire 46 Table 17: 33kV Current Transformer 47 Table 18: 33kV Surge Arresters 49 Table 19: 132kV Dead-End and Suspension Insulators - Discs 51 Table 20: 132kV Post-Type Insulators 52 Table 21: 33/0.4kV Auxiliary Transformer 53 Table 22: Low Voltage AC Distribution Panel for Auxiliary Services 55 Table 23: Battery Bank 110 V DC, 300 Ah 57 Table 24: Battery Charger 58 Table 25: Protection Relays 61 Table 26: Telecommunication System 79 Table 27: Control and Monitoring System 81 Table 28: Under Ground Cable 85 Table 29: 132 kV Isolators without Earthing Switches 91 Table 30: 33 kV Isolators without Earthing Switches 93
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
DEFINITIONS AND ABBREVIATIONS
The following terms may be met in these Technical Schedules and shall be interpreted as follows:
Hz shall mean hertz
kW shall mean kilowatt
MW shall mean megawatt
VA (kVA, MVA) shall mean volt-ampere (kilo-, mega-)
A (kA) shall mean ampere (kilo-)
V (kV) shall mean volt (kilo-)
W/m shall mean watt per metre
AC shall mean alternating current
DC shall mean direct current
IN shall mean rated (nominal) current
UN shall mean rated (nominal) voltage
Ah shall mean ampere-hours
lm shall mean lumen
lm/w shall mean lumen per watt
min shall mean minute
min. shall mean minimum
(prefix) shall mean micro
rms shall mean root mean square
p.u. shall mean per unit
p/p shall mean peak to peak
T shall mean Tesla
kg shall mean kilogram
N shall mean Newton
l shall mean litre
s or sec. shall mean second
No. shall mean number
dB shall mean decibel
Amp shall mean amperes
F shall mean Farad
oC shall mean centigrade
K shall mean degree Kelvin
m2 shall mean square metre (mm2 for millimetre, etc)
m3 shall mean cubic metre (mm3 for millimetre, etc)
m3/s shall mean cubic metres per second
m shall mean metre
cm shall mean centimetre
mm shall mean millimetre
joules shall mean joules per hour
tonne shall mean metric tonne
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
% shall mean percentage
Pascal 1 N/m2
cst shall mean centistoke
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 1: 132/33 kV 23 MVA Power Transformers and On-Load Tap Changer
Minimum Requirements Data offered by Bidder
Description Unit Data
Manufacturer to be
specified
Type 3-phase, oil-
immersed,
with on-load
tap changer
Installation outdoor
Rated maximum voltage (Primary / Secondary) kV 145 / 36
Rated service voltage
Primary side (high voltage) kV 132
Secondary side (low voltage) kV 33
Rated no-load voltage at rated frequency on:
HV, principal tapping kV to be
specified
HV, extreme plus tapping kV to be
specified
HV, extreme minus tapping kV to be
specified
LV kV to be
specified
Rated power ONAN
[Performance Guarantee]
MVA 23
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by Bidder
Description Unit Data
Rated frequency Hz 50
Rated current
Primary side (high voltage) A to be
specified
Secondary side (low voltage) A to be
specified
Vector group Dyn1
Impedance voltage of:
ONAN centre tap % 9.8
Insulation uniform
Type of cooling ONAN
Tapping range ± 1.67%
in ± 8 steps
No-load losses at rated frequency and 100% voltage -
maximum value [Performance Guarantee]
kW to be
specified
Load losses at rated frequency and 100% voltage (75°C)
- maximum value: [Performance Guarantee]
ONAN kW to be
specified
ONAF kW to be
specified
Material of winding copper
Temperature rise at rated power over 40°C maximum
ambient [Performance Guarantee]
oil (upper level) °C 55
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by Bidder
Description Unit Data
winding °C 60
Rated power frequency withstand voltage HV/LV kV 275/70
Rated lightning impulse withstand voltage:
HV windings kV peak 650
LV windings kV peak 170
Short circuit impedance referred to the first winding in
the following pairs: [Performance Guarantee]
At principal tap: high voltage - low voltage / phase to be
specified
At extreme plus tap: high voltage - low
voltage
/ phase to be
specified
At extreme minus tap: high voltage - low
voltage
/ phase to be
specified
Maximum noise level (Lp) [Performance Guarantee] dB (A) 70
Maximum no-load current % In 0.2
Painting
Admiralty
Grey shade
No. 632 as
per BS 381C
Dimensions
length mm to be
specified
width mm to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by Bidder
Description Unit Data
height mm to be
specified
distance between wheels' centres mm to be
specified
Total weight kg to be
specified
Oil weight kg to be
specified
Applicable standard(s) IEC 60076
IEC 60354
Transformer Bushings
Maximum current carrying capacity of bushings:
HV A 120% of IN
LV A 120% of IN
Rated service voltage of bushings:
HV kV 132
LV kV 33
HV, neutral kV To be
specified
LV, neutral kV to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by Bidder
Description Unit Data
1 minute, 50 Hz dry withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
TV bushing kV to be
specified
HV, LV neutral bushings kV to be
specified
1 minute, 50 Hz wet withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
TV bushing kV to be
specified
HV, LV neutral bushings kV to be
specified
Impulse withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by Bidder
Description Unit Data
On-Load Tap Changer
Manufacturer to be
specified
Type to be
specified
Rated current A 175
Rated short-time current
1 second (maximum) kA 31.5
3 seconds kA to be
specified
Step voltage V to be
specified
Number of steps 17
On-load tap changer ±8 x 1.67%
Minimum number of operations operations 200,000
Motor drive
Type to be
specified
Supply voltage V 400/230
Insulation level voltage to earth kV rms to be
specified
Insulation level
Voltage to earth kV rms to be
specified
Impulse test voltage kV peak to be
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by Bidder
Description Unit Data
specified
One-minute power frequency test voltage
(50 Hz)
kV rms to be
specified
Internal insulation levels / one-minute power frequency
test voltage:
between selected and pre-selected tap kV peak to be
specified
kV rms to be
specified
across fine tap winding kV peak to be
specified
kV rms to be
specified
between phases of fine tap winding kV peak to be
specified
kV rms to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 2: 132/33 kV 10 MVA Power Transformer – On load Tap changer
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer 2 to be
specified
Type 3-phase, oil-
immersed,
with on-load
tap changer
Installation outdoor
Rated maximum voltage (Primary / Secondary) kV 145 / 36
Rated service voltage
Primary side (high voltage) kV 132
Secondary side (low voltage) kV 33
Rated no-load voltage at rated frequency on:
HV, principal tapping kV to be
specified
HV, extreme plus tapping kV to be
specified
HV, extreme minus tapping kV to be
specified
LV kV to be
specified
Rated power ONAN
[Performance Guarantee]
MVA 10
Rated frequency Hz 50
Rated current
Primary side (high voltage) A to be
specified
Secondary side (low voltage) A to be
specified
Vector group Dyn11
Impedance voltage of:
ONAN centre tap % 9.8
Insulation uniform
Type of cooling ONAN
Tapping range ± 1.67%
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
in ± 8 steps
No-load losses at rated frequency and 100% volt-
age - maximum value [Performance Guarantee]
kW to be
specified
Load losses at rated frequency and 100% voltage
(75°C) - maximum value: [Performance Guarantee]
ONAN kW to be
specified
ONAF kW to be
specified
Material of winding copper
Temperature rise at rated power over 40°C maxi-
mum ambient [Performance Guarantee]
oil (upper level) °C 55
winding °C 60
Rated power frequency withstand voltage HV/LV kV 275/70
Rated lightning impulse withstand voltage:
HV windings kV peak 650
LV windings kV peak 170
Short circuit impedance referred to the first winding
in the following pairs: [Performance Guarantee]
At principal tap: high voltage - low voltage / phase to be
specified
At extreme plus tap: high voltage - low voltage / phase to be
specified
At extreme minus tap: high voltage - low voltage / phase to be
specified
Maximum noise level (Lp) [Performance Guarantee] dB (A) 70
Maximum no-load current % In 0.2
Painting
Admiralty
Grey shade
No. 632 as
per BS 381C
Dimensions
length mm to be
specified
width mm to be
specified
height mm to be
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
specified
distance between wheels' centres mm to be
specified
Total weight kg to be
specified
Oil weight kg to be
specified
Applicable standard(s) IEC 60076
IEC 60354
Transformer Bushings
Maximum current carrying capacity of bushings:
HV A 120% of IN
LV A 120% of IN
Rated service voltage of bushings:
HV kV 132
LV kV 33
HV, neutral kV to be
specified
LV, neutral kV to be
specified
1 minute, 50 Hz dry withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
TV bushing kV to be
specified
HV, LV neutral bushings kV to be
specified
1 minute, 50 Hz wet withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
TV bushing kV to be
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
specified
HV, LV neutral bushings kV to be
specified
Impulse withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
On-Load Tap Changer
Manufacturer to be
specified
Type to be
specified
Rated current A 175
Rated short-time current
1 second (maximum) kA 31.5
3 seconds kA to be
specified
Step voltage V to be
specified
Number of steps 17
On-load tap changer ±8 x 1.67%
Minimum number of operations operations 200,000
Motor drive
Type to be
specified
Supply voltage V 400/230
Insulation level voltage to earth kV rms to be
specified
Insulation level
Voltage to earth kV rms to be
specified
Impulse test voltage kV peak to be
specified
One-minute power frequency test voltage (50
Hz)
kV rms to be
specified
Internal insulation levels / one-minute power fre-
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
quency test voltage:
between selected and pre-selected tap kV peak to be
specified
kV rms to be
specified
across fine tap winding kV peak to be
specified
kV rms to be
specified
between phases of fine tap winding kV peak to be
specified
kV rms to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 3: 132/33 kV 15 MVA Power Transformer and On load Tap changer
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be
specified
Type 3-phase, oil-
immersed,
with on-load
tap changer
Installation outdoor
Rated maximum voltage (Primary / Secondary) kV 145 / 36
Rated service voltage
Primary side (high voltage) kV 132
Secondary side (low voltage) kV 33
Rated no-load voltage at rated frequency on:
HV, principal tapping kV to be
specified
HV, extreme plus tapping kV to be
specified
HV, extreme minus tapping kV to be
specified
LV kV to be
specified
Rated power ONAN
[Performance Guarantee]
MVA 15
Rated frequency Hz 50
Rated current
Primary side (high voltage) A to be
specified
Secondary side (low voltage) A to be
specified
Vector group Dyn11
Impedance voltage of:
ONAN centre tap
% 9.8
Insulation uniform
Type of cooling ONAN
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Tapping range ± 1.67%
in ± 8 steps
No-load losses at rated frequency and 100% volt-
age - maximum value [Performance Guarantee]
kW to be
specified
Load losses at rated frequency and 100% voltage
(75°C) - maximum value: [Performance Guarantee]
ONAN kW to be
specified
ONAF kW to be
specified
Material of winding copper
Temperature rise at rated power over 40°C maxi-
mum ambient [Performance Guarantee]
oil (upper level) °C 55
winding °C 60
Rated power frequency withstand voltage HV/LV kV 275/70
Rated lightning impulse withstand voltage:
HV windings kV peak 650
LV windings kV peak 170
Short circuit impedance referred to the first winding
in the following pairs: [Performance Guarantee]
At principal tap: high voltage - low voltage / phase to be
specified
At extreme plus tap: high voltage - low voltage / phase to be
specified
At extreme minus tap: high voltage - low voltage / phase to be
specified
Maximum noise level (Lp) [Performance Guarantee] dB (A) 70
Maximum no-load current % In 0.2
Painting
Admiralty
Grey shade
No. 632 as
per BS 381C
Dimensions
length mm to be
specified
width mm to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
height mm to be
specified
distance between wheels' centres mm to be
specified
Total weight kg to be
specified
Oil weight kg to be
specified
Applicable standard(s) IEC 60076
IEC 60354
Transformer Bushings
Maximum current carrying capacity of bushings:
HV A 120% of IN
LV A 120% of IN
Rated service voltage of bushings:
HV kV 132
LV kV 33
HV, neutral kV to be
specified
LV, neutral kV to be
specified
1 minute, 50 Hz dry withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
TV bushing kV to be
specified
HV, LV neutral bushings kV to be
specified
1 minute, 50 Hz wet withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
TV bushing kV to be
specified
HV, LV neutral bushings kV to be
specified
Impulse withstand voltage:
HV bushing kV to be
specified
LV bushing kV to be
specified
On-Load Tap Changer
Manufacturer to be
specified
Type to be
specified
Rated current A 33
Rated short-time current
1 second (maximum) kA 31.5
3 seconds kA to be
specified
Step voltage V to be
specified
Number of steps 17
On-load tap changer ±8 x 1.67%
Minimum number of operations operations 200,000
Motor drive
Type to be
specified
Supply voltage V 400/230
Insulation level voltage to earth kV rms to be
specified
Insulation level
Voltage to earth kV rms to be
specified
Impulse test voltage kV peak to be
specified
One-minute power frequency test voltage (50
Hz)
kV rms to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Internal insulation levels / one-minute power fre-
quency test voltage:
between selected and pre-selected tap kV peak to be
specified
kV rms to be
specified
across fine tap winding kV peak to be
specified
kV rms to be
specified
between phases of fine tap winding kV peak to be
specified
kV rms to be
specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 5: 132 kV Circuit Breaker
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type of circuit breaker outdoor type
Type of arc quenching medium SF6
Model to be specified
Rated maximum voltage kV 145
Rated service voltage kV 132
Rated lightning impulse (BIL)
(at altitude less than 1000 M)
kV peak 650
Power frequency withstand voltage
(at altitude less than 1000 M)
kV rms 275
Rated frequency Hz 50
Number of phases 3
Rated current A 1600
Short circuit breaking current kA 31.5
Short time withstand sec. 1
DC component time constant ms 45
Maximum breaking time ms 50
Maximum closing time ms 100
Related short circuit making current kA peak 100
Number of tripping coils 2
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Number of closing coils 1
Rated power of trip coils w
Rated power of closing coil w
Operating sequence - O – 0.3 s – CO –
3 min – CO
Annual rate of gas leakage at normal pressure % ≤ 1%
Minimum creepage distance mm/kV 31
Rated TRV for faults at terminals
TRV crest value to be specified
TRV rate of rise kV 218
Initial TRV kV/s 2
Time to crest of initial TRV kV 1.4
micro s 0.4
First pole to clear factor 1.5
Maximum over voltage factors for any switching duty P.U 2.3
Maximum over voltage factors when interrupting rated
line/cable/capacitor banks charging currents
P.U 2.3
Maximum over voltage factors when switching small
inductive and reactive current
P.U 2.3
Maximum time interval between closure of first and
last phase of three phase circuit breaker
ms 3
Minimum time from extinction of main arc to contact
make during autoreclsoe time
Operating mechanism
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Type to be specified
Motor voltage V DC 110
Rated power of motor W
Type of device (Motor charged)
-For closing
For opening
Spring or
hydraulic
Closing and opening coil voltage V DC 110
Number of closing coils 1
Spring charging time s to be specified
Manual spring release yes
Hand operating facilty yes
Mechanical Interlocking facility with isolators yes
Emergency trip facility yes
Mechanical On and OFF indicators yes
Number of opening coils 2
Number of auxiliary contacts available 5 No., 5 NC
Main dimensions:
Depth mm to be specified
Height mm to be specified
Weight kg to be specified
Accessories in the motor mech. enclosure
Operation counter yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Local manual control yes
Test switches (dc) yes
Heater yes
Weatherproof, corrosion resistance enclosure IP65
Accessories in the central control panel
Anti-pumping relay yes
Local/distance command selector switch yes
Local operation push buttons yes
Minimum pressure lock-out and alarm relay yes
Lighting, heating and service plug yes
Terminal blocks yes
Test switches (DC) yes
Phase discrepancy timer relay yes
Mounting brackets and hardware yes
With all necessary accessories for installation to be specified
Applicable standard(s) IEC 62271-100
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 6: 132 kV Isolators with Earthing Switches
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type to be specified
Installation outdoor
Rated maximum voltage kV 145
Rated service voltage kV 132
Rated lightning impulse (BIL)(at altitude less than 1000 M) kV peak 650
Power frequency withstand voltage (at altitude less than 1000 M) kV rms 275
Rated short-time current kA 31.5
Rated frequency Hz 50
Number of poles 3
Rated current A 1600
Minimum creepage distance mm/kV 31
Operation motorized
Opening time sec. ≤ 30
Closing time sec. ≤ 30
Rated peak withstand current kA 100
Minimum clearance in air:
Between poles mm 1600
To earth mm 1300
For isolating distance mm to be specified
Type of operating mechanism:
For disconnector motor
For earthing switch manual
Rated supply voltage for operating mechanism V DC 110
Current required at rated supply voltage to operate isolator: A to be specified
Hand operating facility yes
Locking arrangement in Off and On yes
Automatic isolation of control supplies when lock off yes
Rated power of operating coil W
Rated Motor power W
Facing of terminals and contacts to be specified
Shape of terminals of the main circuit to be specified
Number and type of auxiliary switches:
Tin plated for Isolator Yes
For the disconnector 5 NO , 5 NC
For the earth switch to be specified
Auxiliary contact rating A > 10
Wind load Pa to be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
(N/mm²)
Mechanical terminals load:
Straight load N 500
Cross load N 170
Weight of complete disconnector:
With earthing switch kg to be specified
Without earthing switch kg to be specified
Approximate dimensions in open position mm to be specified
Approximate dimensions in close position mm to be specified
With all accessories for installation to be specified
Applicable Standard(s) IEC 62271-102
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 8: 33kV Outdoor Circuit Breaker
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type of circuit breaker outdoor type
Type of arc quenching medium Vacuum
Model to be specified
Rated maximum voltage kV 36
Rated service voltage kV 33
Rated lightning impulse (BIL)
(at altitude less than 1000 M)
kV peak 170
Power frequency withstand voltage
(at altitude less than 1000 M)
kV rms 70
Rated frequency Hz 50
Number of phases 3
Rated current
Incomers and feeders
Bus coupler
A
800
1200
Short circuit breaking current kA 25
6.0 Short time withstand sec. 1
7.0 DC component time constant ms 45
Maximum breaking time ms 50
Maximum closing time ms 120
Related short circuit making current kA peak 62.5
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Number of tripping coils 2
Number of closing coils 1
Operating sequence - O - 0.3 s - CO - 3
min - CO
Annual rate of gas leakage at normal pressure % ≤ 1%
Minimum creepage distance mm/kV 25
Operating mechanism
8.0 Type to be specified
9.0 Motor voltage V DC 110
10.0 Motor power rating KW to be specified
11.0 Closing and opening coil voltage V DC 110
12.0 Number of closing coils 1
13.0 Number of opening coils 2
14.0 Spring charge time
s to be specified
15.0 Manual release spring yes
16.0 Hand operating facility yes
17.0 Emergency trip facility yes
18.0 Mechanical Off and On indicators yes
19.0 Number of auxiliary contacts available 5 No., 5 NC
Main dimensions:
20.0 Depth mm to be specified
21.0 Height mm to be specified
Weight kg to be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Accessories in the motor mech. enclosure
22.0 Operation counter yes
23.0 Local manual control yes
24.0 Test switches (dc) yes
25.0 Heater yes
Weatherproof, corrosion resistance enclosure IP65
Accessories in the central control panel
26.0 Anti-pumping relay yes
27.0 Local/distance command selector switch yes
28.0 Local operation push buttons yes
29.0 Minimum pressure lock-out and alarm
relay
yes
30.0 Lighting, heating and service plug yes
31.0 Terminal blocks yes
32.0 Test switches (DC) yes
33.0 Phase discrepancy timer relay yes
34.0 Mounting brackets and hardware yes
With all necessary accessories for installation to be specified
Applicable standard(s) IEC 62271-100
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 9: 33 kV Isolators with Earthing Switches
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type to be specified
Installation outdoor
Rated maximum voltage kV 36
Rated service voltage kV 33
Rated lightning impulse (BIL)(at altitude less than 1000 M) kV peak 170
Power frequency withstand voltage (at altitude less than 1000 M) kV rms
70
Rated short-time current kA 25
Rated frequency Hz 50
Number of poles 3
Rated current A 800
Hand operating facility yes
Locking arrangement in Off and On yes
yes
Automatic isolation of control supplies when lockoff yes
yes
Rated power of operating coil W
Rated Motor power W
Minimum creepage distance mm/kV 31
Operation motorized
Opening time sec. ≤ 30
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Closing time sec. ≤ 30
Rated peak withstand current kA 100
Minimum clearance in air:
6.0 Between poles mm 500
7.0 To earth mm 435
8.0 For isolating distance mm to be specified
Type of operating mechanism:
9.0 For disconnector Motorised
10.0 For earthing switch manual
Rated supply voltage for operating mechanism V DC 110
Current required at rated supply voltage to operate isolator: A to be specified
Facing of terminals and contacts to be specified
Shape of terminals of the main circuit to be specified
Number and type of auxiliary switches:
11.0 For the disconnector 5 NO , 5 NC
12.0 For the earth switch to be specified
Auxiliary contact rating A > 10
Wind load Pa
(N/mm²)
to be specified
Mechanical terminals load:
13.0 Straight load N 500
14.0 Cross load N 170
Weight of complete disconnector:
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 32
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
15.0 With earthing switch kg to be specified
16.0 Without earthing switch kg to be specified
Approximate dimensions in open position mm to be specified
Approximate dimensions in close position mm to be specified
With all accessories for installation to be specified
Applicable Standard(s) IEC 62271-102
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 10: 132 kV Voltage Transformer
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Type to be specified
Model to be specified
Installation outdoor
Execution
Rated maximum voltage kV 145
Rated primary voltage kV 132/√3
Rated secondary voltage (second winding) kV 0.1/√3
Rated secondary voltage (third winding) kV 0.1/√3
Rated frequency Hz 50
Impulse withstand voltage 1.2/50 micro s wave
(at altitude less than 1000 M)
kV peak 650
Power frequency withstand voltage
(at altitude less than 1000 M)
kV rms 275
Power frequency withstand voltage secondary
winding
kV rms 2
Rated output (second winding/ third winding): VA 100/100
Accuracy class
6.0 For metering 0.2
7.0 For measuring 0.5
8.0 For protection 3P
Voltage factor at rated voltage:
9.0 Continuous 1.2
10.0 30 second 1.5
Thermal limit burden VA to be specified
Normal temperature rise: 28
11.0 Winding °C 50
12.0 Oil °C 45
Maximum temperature rise under short circuit con-
ditions:
13.0 Winding °C to be specified
14.0 Oil °C to be specified
Total height mm to be specified
Minimum creepage distance: mm/kv 31
Size and section of terminals bolts mm to be specified
Weight of oil per pole kg to be specified
Weight total per pole kg to be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Type of oil and reference specification to be specified
Permissible secondary short circuit current A to be specified
Applicable standard(s) IEC 60044-2
60044-5
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 11: 132kV Current Transformer
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Type to be specified
Model to be specified
Installation outdoor
Rated maximum voltage kV 145
Rated service voltage kV 132
Rated lightning impulse (BIL) (at altitude less than 1000 M) kV 650
Power frequency withstand voltage (at altitude less than 1000 M) kV 275
Rated frequency Hz 50
Rated primary current
6.0 for line feeder A 800 - 400 - 200
7.0 for transformer feeder A 800 - 400 - 200
Rated secondary currents A 1 - 1 - 1
Number of cores:
8.0 for measuring purposes 1
9.0 for metering purposes 1
10.0 for protection purposes 2
11.0 for busbar purposes 1
Rated burden for measuring core VA 15
Accuracy class 0.5 M 5
Rated burden for metering core VA 30
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Accuracy class 0.2
Rated burden for protection cores VA 30
Accuracy class 5 P 20
Rating for Diferential, Busbarandd Restricted earth fault cores VA 30
Accuracy i) Class
ii)Vk
iii)Im at
Vk
to be specified
Short-time current ratings:
12.0 Thermal (Ith) kA 31.5
13.0 Dynamic (Idyn) kA 80
The minimum guaranteed instrument security factor, for metering
current transformer
to be specified
Impulse wave to be specified
Mechanical load of primary terminal:
14.0 Dynamic load N to be specified
15.0 Static load N to be specified
Minimum clearance mm to be specified
Minimum creepage distance mm/kV 31
Size and section of terminal bolts to be specified
Weight per pole kg to be specified
Weight of oil per pole kg to be specified
Type of oil and reference specification to be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Dimensions mm to be specified
With all accessories for installation to be specified
Applicable standard(s) IEC 60044-1
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 12: 132kV Surge Arresters
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Type to be specified
Installation outdoor
Nominal system voltage kV 132
Rated operating voltage (Ur) kV 108
Rated continuous operating voltage (Uc) kV 84
Rated frequency Hz 50
Nominal discharge current kA 10
Residual voltage for:
6.0 Lightning current 8/20 impulse kV to be specified
7.0 Step current 1/20 impulse of 10 kA kV to be specified
Switching current 30/60 impulse of 500 A/1000 A kV to be specified
High current 4/10 impulse withstand value kA 100
Low current, long duration current impulse withstand
(upper value)
A 1000
Line discharge class 3
Absorption capability in kJ/kV of arrester rating at
thermal stability
kJ/kV 8
Pressure relief class class A
Suitability for fault current kA 40
Power frequency 1 min. withstand voltage, wet (at kV 275
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
altitude less than 1000 M)
Maximum RIV at 1000 kHz measured at 1.05 time the
system highest voltage
micro V 500
Impulse withstand voltage of arrester insulation
external assembly (at altitude less than 1000 M)
kV crest 650
Maximum short circuit rating kA 31.5
Overall height of arrester mm to be specified
Creepage distance mm/kV 31
Weight of arrester kg to be specified
Arrester classification heavy duty, station-
type gapless metal
oxide or equivalent
Accessories: 132 kV surge arrester discharge counter
8.0 Type outdoor
9.0 Counter indication digital
10.0 Protection class IP 54
11.0 Number per 3 arresters 1
Applicable Standard(s) IEC 60099-1, 1A, 2,
4
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 40
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 13: 33kV Voltage Transformer
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Type to be specified
Model to be specified
Installation outdoor
Execution
Rated maximum voltage kV 36
Rated primary voltage kV 33/√3
Rated secondary voltage (second winding) kV 0.1/√3
Rated secondary voltage (third winding) kV 0.1/√3
Rated frequency Hz 50
Impulse withstand voltage 1.2/50 micro s wave
(at altitude less than 1000 M)
kV peak 170
Power frequency withstand voltage
(at altitude less than 1000 M)
kV rms 70
Power frequency withstand voltage secondary
winding
kV rms 2
Rated output (second winding/ third winding): VA 100/100
Accuracy class
6.0 For metering 0.2
7.0 For measuring 0.5
8.0 For protection 3P
Voltage factor at rated voltage:
9.0 Continuous 1.2
10.0 30 second 1.5
Thermal limit burden VA to be specified
Normal temperature rise: 28
11.0 Winding °C 50
12.0 Oil °C 45
Maximum temperature rise under short circuit con-
ditions:
13.0 Winding °C to be specified
14.0 Oil °C to be specified
Total height mm to be specified
Minimum creepage distance: mm/kv 31
Size and section of terminals bolts mm to be specified
Weight of oil per pole kg to be specified
Weight total per pole kg to be specified
Type of oil and reference specification to be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Permissible secondary short circuit current A to be specified
Applicable standard(s) IEC 60044-2,
60044-5
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 14:33kV Surge Arresters
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Type to be specified
Installation outdoor
Nominal system voltage kV 33
Rated operating voltage (Ur) kV 30
Rated continuous operating voltage (Uc) kV 21
Rated frequency Hz 50
Nominal discharge current kA 10
Residual voltage for:
6.0 Lightning current 8/20 impulse kV to be specified
7.0 Step current 1/20 impulse of 10 kA kV to be specified
Switching current 30/60 impulse of 500 A/1000 A kV to be specified
High current 4/10 impulse withstand value kA 100
Low current, long duration current impulse withstand
(upper value)
A 1000
Line discharge class 3
Absorption capability in kJ/kV of arrester rating at
thermal stability
kJ/kV 8
Pressure relief class class A
Suitability for fault current kA 40
Power frequency 1 min. withstand voltage, wet kV 70
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Maximum RIV at 1000 kHz measured at 1.05 time the
system highest voltage
micro V 500
Impulse withstand voltage of arrester insulation
external assembly
kV crest 170
Maximum short circuit rating kA 25
Overall height of arrester mm to be specified
Creepage distance mm/kV 31
Weight of arrester kg to be specified
Arrester classification heavy duty, station-
type gapless metal
oxide or equivalent
Accessories: 132 kV surge arrester discharge counter
8.0 Type outdoor
9.0 Counter indication digital
10.0 Protection class IP 54
11.0 Number per 3 arresters 1
Applicable Standard(s) IEC 60099-1, 1A, 2,
4
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 15:Busbar Conductor ACSR 435/55 mm²
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Type Aluminium
conductor steel-
reinforced
(ACSR)
Nominal cross-section mm² 435/55
Cross-section ratio Al/St approx. 7.7
Steel
Construction mm 7 x 32
Diameter mm 9.6
Cross-section mm² 56.3
Aluminium
Construction mm 54.32
Cross-section mm² 434.3
Total cross-section mm² 490.6
Conductor diameter approx. mm 28.8
Conductor weight
Steel kg/km 44.1
Aluminium kg/km 1.199
Without grease total approx. kg/km 1.640
With grease total approx. kg/km 1.646
Calculated conductor breaking load N 136.450
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Calculated conductor resistance at 20 °C ohm/km 0.067
Standard length per reel approx. m to be specified
Dispatch reel nominal size m to be specified
Current carrying capacity A 2000
Applicable Standard(s) IEC 60209
DIN 48 204
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 46
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 16: Busbar Shield Wire
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Material steel galvanized
Cross-section
Nominal cross section mm² 50
Actual cross section mm² 49.48
Number of wires number 7
Wire diameter mm 3.00
Conductor diameter mm 9
Weight: kg/km 391
Calculated conductor braking load kN 61.58 (St III)
Weight of zinc coating g/mm² 5.188
Applicable Standard(s) IEC 60076
IEC 60289
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 17: 33kV Current Transformer
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Type to be specified
Model to be specified
Installation outdoor
Rated maximum voltage kV 36
Rated service voltage kV 33
Rated lightning impulse (BIL) (at altitude less than 1000 M) kV 170
Power frequency withstand voltage (at altitude less than
1000 M)
kV 70
Rated frequency Hz 50
Rated primary current
6.0 for line feeder A 400 - 200 - 100
7.0 for transformer feeder A 800 - 400 - 200
Rated secondary currents A 1 - 1 - 1
Number of cones:
8.0 for measuring purposes 1
9.0 for metering purposes 1
10.0 for protection purposes 2
Rated burden for measuring core VA 30
Accuracy class 0.5 M 5
Rated burden for metering core VA 30
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 48
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Accuracy class 0.2
Rated burden for protection cores VA 30
Accuracy class 5 P 20
Short-time current ratings:
11.0 Thermal (Ith) kA 25
12.0 Dynamic (Idyn) kA 60
The minimum guaranteed instrument security factor,
for metering current transformer
to be specified
Impulse wave to be specified
Mechanical load of primary terminal:
13.0 Dynamic load N to be specified
14.0 Static load N to be specified
Minimum creepage distance mm/kV 31
Size and section of terminal bolts to be specified
Weight per pole kg to be specified
Weight of oil per pole kg to be specified
Type of oil and reference specification to be specified
Dimensions mm to be specified
With all accessories for installation to be specified
Applicable standard(s) IEC 60044-1
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 49
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 18: 33kV Surge Arresters
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Type to be specified
Installation outdoor
Nominal system voltage kV 33
Rated operating voltage (Ur) kV 30
Rated continuous operating voltage (Uc) kV 21
Rated frequency Hz 50
Nominal discharge current kA 10
Residual voltage for:
6.0 Lightning current 8/20 impulse kV to be specified
7.0 Step current 1/20 impulse of 10 kA kV to be specified
Switching current 30/60 impulse of 500 A/1000 A kV to be specified
High current 4/10 impulse withstand value kA 100
Low current, long duration current impulse with-
stand (upper value)
A 1000
Line discharge class 3
Absorption capability in kJ/kV of arrester rating at
thermal stability
kJ/kV 8
Pressure relief class class A
Suitability for fault current kA 40
Power frequency 1 min. withstand voltage, wet kV 70
Maximum RIV at 1000 kHz measured at 1.05 time
the system highest voltage
micro V 500
Impulse withstand voltage of arrester insulation
external assembly
kV crest 170
Maximum short circuit rating kA 25
Overall height of arrester mm to be specified
Creepage distance mm/kV 31
Weight of arrester kg to be specified
Arrester classification heavy duty,
station-type
gapless metal
oxide or
equivalent
Accessories: 132 kV surge arrester discharge
counter
8.0 Type outdoor
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 50
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
9.0 Counter indication digital
10.0 Protection class IP 54
11.0 Number per 3 arresters 1
Applicable Standard(s) IEC 60099-1, 1A,
2, 4
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 51
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 19: 132kV Dead-End and Suspension Insulators - Discs
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Material
porcelain, glass
disc, composite
polymer
Rated maximum voltage (String) kV 145
Service voltage (String) kV 132
Individual Disc Data
Disc diameter (minimum) mm 254
Spacing mm 146
Flashover values:
Power frequency voltage kV rms 132
Power frequency
6.0 Dry kV 95
7.0 Wet kV 55
Lightning impulse:
8.0 Positive kV 125
9.0 Negative kV 130
Radio interference voltage (RIV):
10.0 Test voltage to ground kV 10
11.0 Max. RIV at 1000 kHz micro V 50
Nominal creepage distance mm 432
Dry arcing distance mm 203.2
Weight: kg to be indicated
Accessories: to be indicated
12.0 Clevis
13.0 Tongue fittings
ANSI class 52.6
Applicable Standard(s) IEC 60016,
IEC 60305,
IEC 60433,
IEC 60076,
IEC 60289
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 20: 132kV Post-Type Insulators
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer's name to be indicated
Material porcelain or
polymer ,
composite
polymer
Installation outdoor
Rated maximum voltage kV 145
Rated service voltage kV 132
Lightning impulse withstand voltage (at altitude less
than 1000 M)
kV peak 650
Power frequency 1 min. withstand voltage (at
altitude less than 1000 M)
kV 275
Maximum RIV at 1000 kHz micro V 500
Nominal creepage distance mm/kV 31
Mechanical values:
6.0 Cantilever kg 800
7.0 Tensional strength kgm 400
Weight: kg to be specified
Accessories: to be specified
8.0 Connectors
9.0 Joints
10.0 Clamps
Applicable Standard(s) IEC 60016,
IEC 60168,
IEC 60865,
IEC 60273
DIN 48 013
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 21: 33/0.4kV Auxiliary Transformer
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type 3-phase, oil-
immersed
Installation indoor
Maximum Opering Voltage kV 36 / 0.430
Rated service voltage:
6.0 Primary side (high voltage) kV 33
7.0 Secondary side (low voltage) kV 0.4
Rated power kVA 100
Rated frequency Hz 50
Rated current:
8.0 Primary side (high voltage) A 2
9.0 Secondary side (low voltage) A 5
Vector group Dyn11
Impedance voltage % 4
Type of cooling ONAN
Off-load tap changer regulation ± 2 x 2.5%
Losses:
10.0 No-load losses W to be specified
11.0 Load losses W to be specified
Rated power frequency withstand voltage kV 70
Rated lightning impulse withstand voltage kV peak 170
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 54
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Sound power level dB (A) 68
Painting
Admiralty Grey
shade No. 632 as
per BS 381C
Dimensions:
12.0 Length mm to be specified
13.0 Width mm to be specified
14.0 Height mm to be specified
15.0 Distance between the wheel's centres mm to be specified
Total weight kg to be specified
Oil weight kg to be specified
Applicable standard(s) IEC 60076
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 22: Low Voltage AC Distribution Panel for Auxiliary Services
Minimum Requirements Data offered by
Bidder Description Unit Data
General
Manufacturer's name to be specified
Type metal clad, in-
door, air insu-
lated
Installation indoor
Rated Voltage V 400/230
Rated frequency Hz 50
Busbar
Rated currents A to be specified
Material copper
Short-circuit current (1 s.) kA 10
Number of 3-phase outgoings to be specified
Number of 1-phase outgoings to be specified
Protection IP 4X
Equipment
16.0 Main 3-phase 4-poles moulded case
circuit breakerfor incoming feeder
to be specified
17.0 3 current transformer to be specified
18.0 3-phaseactive energy meter to be specified
19.0 1 AC current meter to be specified
20.0 1 current switch, 3 positions to be specified
21.0 1 AC volt meter to be specified
22.0 1 rotary voltage switch, 7 positions to be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 56
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
23.0 3-phase 4-pole moulded case circuit
breaker for outgoing feeders
to be specified
24.0 1-phase 2-pole moulded case
circuitbreaker for outgoing feeders
to be specified
25.0 1 outlet socket 220 V, 50 Hz, 10 A to be specified
Dimensions
26.0 length mm to be specified
27.0 height mm to be specified
28.0 depth mm to be specified
Weight kg to be specified
Applicable standard(s) IEC 60364
IEC 60439
VDE 0100
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 23: Battery Bank 110 V DC, 300 Ah
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type sealed OPzV, lead-
acid, tubular plate,
electrolyte in gel
form
Model to be specified
Installation indoor, vertically on
racks
Electrolyte sulphuric acid, fixed
as gel
Container lid styrene acrylonitrile
(SAN) plastic
Positive electrodes tubular plate, lead
calcium alloy
Connector technique bolted connectors,
completely insulated
Number of cells to be specified
Nominal voltage V DC 110
Nominal capacity at 10 hour discharge rate Ah 300
Float voltage per cell V to be specified
Float charging current A to be specified
Boost charging voltage per cell V to be specified
Boost charging current A to be specified
Battery voltage at end of duty cycle V to be specified
Short circuit current A to be specified
Internal resistance to be specified
Life expectancy years ≥ 20
Cycling capacity cycles > 1,200
Weights and dimensions:
6.0 total weight of battery (incl. electrolyte) kg to be specified
7.0 weight per cell (incl. electrolyte) kg to be specified
8.0 width x depth x height per cell mm to be specified
Applicable standard(s) IEC 60896
IEC 61056
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 24: Battery Charger
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type 2 full capacity redun-
dant
Model to be specified
Design fully electronic stan-
dard design
Characteristics I/U characteristic
with high tempera-
ture stability
Circuit configuration 3-phase full wave
bridge circuit
Installation indoor, in metal-clad
cubicles with front
door; all equipment
accessible from the
front side
Protection class IP41
AC supply:
29.0 Rated service voltage V 400/230
30.0 Frequency Hz 50
31.0 Rated current A to be specified
DC output:
32.0 Rated service voltage V 110
33.0 Voltage setting range % ±5
34.0 Float charging voltage V 125 (at 2.23 V/cell)
35.0 Boost charging voltage V 2.4 per cell
36.0 Regulation error of output voltage:
- at load variation 0-100% % ± 1
- at frequency variations 50 Hz % ± 5
- at input voltage variation % ± 10
37.0 Output voltage regulation with current
limiting range
±2% within voltage
range of 80-100%
38.0 Regulation characteristic I/U as per DIN
41773 or equivalent
39.0 Ripple content % < 10 (pp) without
battery
40.0 Permissible humidity acc. to IEC
41.0 Radio interference "A" according to EN
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 59
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
55011
42.0 Derating factor (thyristors) 2.3 as per VDE
0160
43.0 Cooling natural circulation
44.0 Fuse switch disconnector (charger output) to be specified
45.0 Control unit with integrated mains filter,
phase failure supervision, soft start facility,
pulse blocking, cut-in delay
to be specified
Monitoring devices:
46.0 Detailed fault alarm including collective
fault alarm and additional visual signalling at
front door
to be specified
47.0 Three-phase overvoltage and
undervoltage supervision
to be specified
48.0 Current-controlled DC undervoltage
supervision
to be specified
49.0 DC overvoltage supervision with
delayed/undelayed cut-off
to be specified
50.0 Integrated supervision of thyristor fuses to be specified
51.0 Fuse supervision of auxiliary and control
circuits
to be specified
52.0 Ripple monitoring to be specified
53.0 Time to recharge battery to 80% capacity
from fully discharged state
hour 10
Measuring:
54.0 Volt meter and ammeter (charger output) to be specified
55.0 Battery tension, consumer tension to be specified
56.0 Charger current, consumer current to be specified
Disturbance reports:
57.0 Main failure, rectifier tensions too low to be specified
58.0 Battery circle too low, rectifier tension too
high, battery deeply unloaded
to be specified
59.0 Battery circle disturbed, ground fault
plus/minus
to be specified
60.0 Capacity test negative, short circuit to be specified
Efficiency % 80
Weight kg to be specified
Width x depth x height mm to be specified
Applicable standard(s) IEC 60146
IEC 60364
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 60
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
IEC 60439
IEC 60947
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 61
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 25: Protection Relays
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
LINE DIFFERENTIAL PROTECTION AND BACK
UP DISTANCE (87l/21)
Manufacturer to be specified
Type reference
Relay design (microprocessor based, numerical) Numerical
Auxialliary Voltage range (Vn= 110 V dc Vdc 77-150
Input frequency range (50Hz Nominal) Hz 47.5-52.5
Differential protection requirements
Phase segregated protection Yes
Ratio and Vector correction for CTs Yes
Adjustable biased differential protection
characteristics
yes
Sensitivity
- For phase faults
- For earth faults
- Operating time
ms <30
Distance protection requirements
3 zone ph-ph&ph-E yes
Phase fault & Earth fault characteristic shapes
(Mho, Quad)
yes
Operating time ms <30
SOTF Yes
Power swing Blocking ( depending on relaying
point in the power system
yes
Voltage transformer supervison yes
time delay for all zones yes
Zone enable/disable for all zones yes
Other requirements
Thermal overload, 49 no
Circuit breaker failure 50BF (dependent on
application)
yes
Event recording function yes
Disturbance recording function yes
Fault locator function yes
Intergral operator interface for local interrogation yes
Programmable scheme logic yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 62
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
yes
carry continuous current 1A yes
Make 6A max. for 0.2s yes
Break dc 50W resistive
25W inductive (L/R 40ms)
yes
Self checking facility yes
Intergralintertrip send and receive, with external
input interface
yes
Communications
Protection
Direct optical fibre 1300nm single mode
yes
Control
Communication ports ( Front/rear etc)
(Note: Two Rear ports for NCC and RCC)
Physsical links (R485/Fibre optic)
Protocol supported
- IEC 60870-5-101
- IEC 61850
yes
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
yes
Mechanical Environment
Vibration IEC 60255-21-1
Shock and bump IEC 60255-21-2
Seismic IEC 60255-21-3
Yes Yes yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Yes
Yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 63
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Impulse voltage
IEC 60255-5 test voltage 5kv
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
DISTANCE PROTECTION (21)
Manufacturer to be specified
Type reference
Relay design (microprocessor based, numerical) Numerical
Auxialliary Voltage range (Vn= 110 V dc Vdc 77-150
Input frequency range (50Hz Nominal) Hz 47.5-52.5
Distance protection requirements
3 zone ph-ph&ph-E yes
Phase fault & Earth fault characteristic shapes
(Mho, Quad)
yes
Operating time ms <30
SOTF Yes
Power swing Blocking ( depending on relaying
point in the power system
yes
Voltage transformer supervision yes
Time delay for all zones yes
Teleprotection modes PUR/POR/Block yes
DEF plain and Blocking modes yes
Z1 min and max operating time (mid Zone)
Zone enable/disable for all zones yes
Other requirements
Thermal overload, 49 no
Circuit breaker failure 50BF- (dependent on yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 64
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
application)
Event recording function yes
Disturbance recording function yes
Fault locator function yes
Integral operator interface for local interrogation yes
Programmable scheme logic yes
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
yes
carry continuous current 1A yes
Make 6A max. for 0.2s yes
Break dc 50W resistive
25W inductive (L/R 40ms)
yes
Self checking facility yes
Integral inter-trip send and receive, with external
input interface
yes
Communications
Protection
Direct optical fibre 1300nm single mode
yes
Control
Communication ports ( Front/rear etc)
(Note: Two Rear ports for NCC and RCC)
Physical links (R485/Fibre optic)
Protocol supported
- IEC 60870-5-101
- IEC 61850
yes
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
yes
Mechanical Environment
Vibration IEC 60255-21-1
Shock and bump IEC 60255-21-2
Seismic IEC 60255-21-3
Yes Yes yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 65
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
LOW IMPEDANCE BUSBAR PROTECTION
INCLUDING BREAK FAILURE PROTECTION
Manufacturer to be specified
Type reference
Relay design (microprocessor based, numerical) Numerical
Auxiliary Voltage range (Vn= 110 V dc Vdc 77-150
Input frequency range (50Hz Nominal) Hz 47.5-52.5
State principle of operation i.e. low impedance
Integral check zone feature (state principle of
operation)
Yes
Distributed bay modules and central Unit (Y/N) Yes
Maximum number of bays yes
- Isolator replica ms <30
CT saturation detector and stabilisation
Integral CT Supervision yes
CT matching Functions yes
Phase segregated protection ms <30
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 66
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Two stage breaker failure
Phase faults
Earth fault
Facility to initiate the scheme by auxialiary contacts
I,eBucholz operation
2 out 4 check of current detectors Independently
settable delay times for operation with and without
current
Input trip contact
Yes
Yes
Yes
Yes
Other requirements
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
yes
carry continuous current 1A yes
Make 6A max. for 0.2s yes
Break dc 50W resistive
25W inductive (L/R 40ms)
yes
Self checking facility yes
Integral inter-trip send and receive, with external
input interface
yes
Communications
Protection
Direct optical fibre 1300nm single mode
yes
Control
Communication ports ( Front/rear etc)
(Note: Two Rear ports for NCC and RCC)
Physical links (R485/Fibre optic)
Protocol supported
- IEC 60870-5-101
- IEC 61850
yes
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 67
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
IEC 60529 IP50
Mechanical Environment
Vibration IEC 60255-21-1
Shock and bump IEC 60255-21-2
Seismic IEC 60255-21-3
Yes Yes yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Multifunction Overcurrent & Earth fault
protection (50/51/50N/51N
Manufacturer to be specified
Type reference
Relay design (microprocessor based, numerical) Numerical
Auxialliary Voltage range (Vn= 110 V dc Vdc 77-150
Input frequency range (50Hz Nominal) Hz 47.5-52.5
Number of phase CT inputs
Number of earth fault CT inputs
Standard, Very and Extreme inverse and definite
time characteristics curves conforming to
IEC60255
Yes
Number of inverse overcurrent functions per phase
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 68
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Number of high set overcurrent functions per phase
Number of low set overcurrent functions per phase
Number of inverse earth fault functions
Number of high set earth fault functions
Number of low set earth fault functions
Number of group setting
Earth fault element suitable of high impedance
REF (with external resistor)
Yes
operating time at 5X setting when configured for
REF
ms 30
Suitable for Blocked overcurrent busbar protection
scheme
yes
Other requirements
Thermal overload, 49 (Y/N)
Directional O/C and E/F (Y/N)
Number of output relays
Rated for tripping
Rated for control and alarm
Integral metering functions yes
Opto-isolator inputs yes
Event recording function yes
Disturbance recording function yes
Intergral operator interface for local interrogation yes
Programmable scheme logic yes
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
yes
carry continuous current 1A yes
Make 6A max. for 0.2s yes
Break dc 50W resistive
25W inductive (L/R 40ms)
yes
Self checking facility yes
Intergralintertrip send and receive, with external
input interface
yes
Communications
Protection
Direct optical fibre 1300nm single mode
yes
Control
Communication ports ( Front/rear etc)
(Note: Two Rear ports for NCC and RCC)
yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 69
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Physical links (RS485/Fibre optic)
Protocol supported
- IEC 60870-5-101
- IEC 61850
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
yes
Mechanical Environment
Vibration IEC 60255-21-1
Shock and bump IEC 60255-21-2
Seismic IEC 60255-21-3
Yes Yes yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements Data offered by
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 70
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Description- Protection and indication system Unit Data Bidder
Multifunction Directional Overcurrent & Earth
fault protection (50/51/50N/51N
Manufacturer to be specified
Type reference
Relay design (microprocessor based, numerical) Numerical
Auxialliary Voltage range (Vn= 110 V dc Vdc 77-150
Input frequency range (50Hz Nominal) Hz 47.5-52.5
Number of phase CT inputs
Number of earth fault CT inputs
Three phase VT input
Method of determining zero sequence voltage
Broken delta VT input (Y/N)
Derived mathematically (Y/N)
Standard, Very and Extreme inverse and definite
time characteristics curves conforming to
IEC60255
Yes
Number of inverse DOC functions per phase
Number of high set DOC functions per phase
Number of low set DOC functions per phase
Number of inverse DEF functions
Number of high set DEF functions
Number of low set DEF functions
Number of group setting
Other functions provided
Non directional O/C 50/51 (Y/N)
Non directional E/F 50N/51N (Y/N)
Thermal Overload 49 (Y/N)
Suitable for Blocked overcurrent busbar
protection scheme
Earth fault element suitable of high
impedance REF (with external resistor)
Number of output relays
Rated for tripping
Rated for control and alarm
Yes
Other requirements
Integral metering functions yes
Opto-isolator inputs yes
Event recording function yes
Disturbance recording function yes
Intergral operator interface for local interrogation yes
Programmable scheme logic yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 71
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
yes
carry continuous current 1A yes
Make 6A max. for 0.2s yes
Break dc 50W resistive
25W inductive (L/R 40ms)
yes
Self checking facility yes
Intergralintertrip send and receive, with external
input interface
yes
Communications
Protection
Direct optical fibre 1300nm single mode
yes
Control
Communication ports ( Front/rear etc)
(Note: Two Rear ports for NCC and RCC)
Physical links (RS485/Fibre optic)
Protocol supported
- IEC 60870-5-101
- IEC 61850
yes
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
yes
Mechanical Environment
Vibration IEC 60255-21-1
Shock and bump IEC 60255-21-2
Seismic IEC 60255-21-3
Yes Yes yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Yes
Yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 72
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Impulse voltage
IEC 60255-5 test voltage 5kv
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
TRANSFORMER DIFFERENTIAL PROTECTION
Manufacturer to be specified
Type reference
Relay design (microprocessor based, numerical) Numerical
Auxiliary Voltage range (Vn= 110 V dc Vdc 77-150
Input frequency range (50Hz Nominal) Hz 47.5-52.5
Differential protection requirements
Phase segregated protection Yes
Ratio and Vector correction for CTs Yes
Adjustable biased differential protection
characteristics
yes
Sensitivity
- For phase faults
- For earth faults
- Operating time
ms <30
5th
Harmonic restraint yes
Other requirements
High set element yes
Magnetising current inrush restraint yes
Measurement and indication on MMI of phase HV
and LV differential and bias current
yes
Separate function that performs overfluxing Yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 73
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
protection with trip and alarm functions
Overcurent and earth fault yes
Event recording function yes
Disturbance recording function yes
Latching output contact yes
Integral operator interface for local interrogation yes
Programmable scheme logic yes
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
yes
carry continuous current 1A yes
Make 6A max. for 0.2s yes
Break dc 50W resistive
25W inductive (L/R 40ms)
yes
Self checking facility yes
Integral inter-trip send and receive, with external
input interface
yes
Communications
Protection
Direct optical fibre 1300nm single mode
yes
Control
Communication ports ( Front/rear etc)
(Note: Two Rear ports for NCC and RCC)
Physical links (RS485/Fibre optic)
Protocol supported
- IEC 60870-5-101
- IEC 61850
yes
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
yes
Mechanical Environment
Vibration IEC 60255-21-1
Shock and bump IEC 60255-21-2
Yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 74
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Seismic IEC 60255-21-3 Yes yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
TRANSFORMER RESTRICTED EARTH FAULT
PROTECTION
Manufacturer to be specified
Type reference
Relay design (microprocessor based, numerical) Numerical
Auxiliary Voltage range (Vn= 110 V dc Vdc 77-150
Input frequency range (50Hz Nominal) Hz 47.5-52.5
Differential protection requirements
Phase segregated protection Yes
Principal of operation – high impedance yes
Ratio correction for CTs Yes
Stabilising resistor and voltage dependent resistor
included
yes
Sensitivity
- For earth faults
ms <25
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 75
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
- Operating time at 5X
reject harmonics produced by CT saturation yes
Other requirements
Event recording function yes
Disturbance recording function yes
Latching output contact yes
Integral operator interface for local interrogation yes
Programmable scheme logic yes
User friendly HMI, Window based software for
relay setting, relay configuration and event,
disturbance and fault record management .
yes
carry continuous current 1A yes
Make 6A max. for 0.2s yes
Break dc 50W resistive
25W inductive (L/R 40ms)
yes
Self checking facility yes
Intergralintertrip send and receive, with external
input interface
yes
Communications
Protection
Direct optical fibre 1300nm single mode
yes
Control
Communication ports ( Front/rear etc)
(Note: Two Rear ports for NCC and RCC)
Physical links (RS485/Fibre optic)
Protocol supported
- IEC 60870-5-101
- IEC 61850
yes
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
yes
Mechanical Environment
Vibration IEC 60255-21-1
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 76
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Shock and bump IEC 60255-21-2
Seismic IEC 60255-21-3
Yes Yes yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
TRIP CIRCUIT SUPERVISION
Manufacturer to be specified
Type reference
Relay design(Electro-mech, static, numerical)
Auxialliary Voltage range (Vn= 110 V dc Vdc 77-150
Operating time ms
Supervision of the whole trip circuit with CB open
and closed
Relay operated indicator
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
Enclosure
IEC 60529 IP50
yes
Mechanical Environment
Vibration IEC 60255-21-1
Shock and bump IEC 60255-21-2
Seismic IEC 60255-21-3
Yes Yes yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burst disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
MULTI CONTACT TRIPPING RELAYS
Manufacturer to be specified
Type reference
Auxialliary Voltage range (Vn= 110 V dc Vdc 77-150
Is relay mechanically latched or self resetting
Method used to reset latched relay (Hand or
electrical0
Minimum voltage at which reliable operation occurs Yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description- Protection and indication system Unit Data
carry continuous current 5A yes
Make 30A max. for 0.2s yes
Break dc 50W resistive
25W inductive (L/R 40ms)
yes
Relay operated indicator type yes
Type tests
Atmospheric
Operation -25C and 55C for 96hrs, IEC 60068-2-1
Transport/storage – 25 and 70C for 96 hrs, IEC
60068-2-
yes
Relative Humidity
Operation at 93%
Tested to IEC 60068-2-3 with severity class 56
days
yes
Enclosure
IEC 60529 IP50
yes
Mechanical Environment
Vibration IEC 60255-21-1
Shock and bump IEC 60255-21-2
Seismic IEC 60255-21-3
Yes Yes yes
Insulation
Rated Insulation
1000V high impedance protection CT inputs
250V for other circuits
1000V open contact withstand Dielectric tests
IEC 60255-5-Series C of table 1
Impulse voltage
IEC 60255-5 test voltage 5kv
Yes
Yes
yes
Electromagnetic compatibility
1Mhz Burs disturbance test,
IEC 60255-22-1 severity class II
Electrostatic discharge
IEC 60255-22-2 severity class III
Radiated Electromagnetic field Disturbance
IEC 60255-22-3 severity class III
Test method A, 27Mhz through 500Mhz
Electromagnetic Emissions
IEC 60255-25
Fast transient disturbance
IEC 60255-22-4 severity level Iv
Type test certificates to be provided
Yes
Yes
Yes
Yes
Yes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 26: Telecommunication System
Minimum Requirements Data offered by
Bidder Description Unit Data
Applicable standards for insulation / EMC / ESD
tests:
6.0 Protection IEC 60265-4, -
5, -6 (22-1, -2, -
3, -4) class III
IEC 6081-1, -2,
-3, -4
IEC 60834-1
7.0 Telecontrol IEC 60255-4, -
5, -6, class II/III
IEC 60801-1, -
2, -3, -4
IEC 60870-1, -
2, -3, -4
OLTE transceiver characteristics:
8.0 Optical wave length nm 1550 or 1310
9.0 Optical source laser
10.0 Optical source life span better than 15
years
11.0 Optical fibre type single mode
12.0 Optical connectors Type FC-PC
13.0 Jitter performance: ITU-T recom-
mendation
G.823
14.0 Power supply V 48 V DC
15.0 Capacity Mbps 8
Digital multiplexers:
16.0 spare channel capacity after
commissioning on each transmission section
(both main and backup)
≥ 30%
Optical fibre salient characteristics:
17.0 Number of fibres 48 minimum
18.0 Core diameter m 8.3 or 9 with a
± 3% tolerance
19.0 Cladding design m either matched
or depressed
20.0 Clad diameter m 125.0 ± 2
21.0 Core-clad concentricity less than 2%
22.0 Coating diameter m 250 ± 15
23.0 Coating concentricity ≥ 0.7
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 80
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
24.0 Attenuation:
1310 nm dB/km ≤ 0.40
1550 nm dB/km ≤ 0.22
25.0 Bending attenuation:
1310 nm (75 mm) dB ≤ 0.05 (100
turns)
1550 nm (75 mm) dB ≤ 0.10 (100
turns)
26.0 Temperature dependence dB/km ≤ 0.05 (-20 to
+85°C)
27.0 Cut-off wave length nm ≤ = 1250
Chromatic dispersion:
28.0 Zero dispersion at: nm 1310 ± 12
29.0 Zero dispersion slope (max.) ps/nm²/km 0.092
30.0 Zero dispersion at nm 1550 ± 15
31.0 Zero dispersion slope (max.) ps/nm²/km 0.085
32.0 Mode field diameter:
1300 nm mm 9.30 ± 0.50
1550 nm mm 10.50 ± 1.00
33.0 IL proof test level g/m² 35 x 106
34.0 Splice attenuation dB/splice 0.02
35.0 Connector loss dB/connector ≤ 0.5
Construction requirements:
36.0 Transmission parameters:
Bit error rate (path including terminals at n x 2
Mbit/s
< 1 x 10-10
Jitter performance n x 2 Mbit/s acc. to G.823
Teleprotection interface (test voltages according to
IEC 60255-4):
37.0 Isolation (0.5 J, 1 min.) kV/DC 2
38.0 Pulse 1.2/50 µs kV 1
Telephone system:
39.0 Number of subscriber lines 1
40.0 Number of trunk lines 1
41.0 Equipped spare capacity after
commissioning
% 30
42.0 Capacity for additional lines % 50 (min.)
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 27: Control and Monitoring System
Minimum Requirements Data offered by
Bidder Description Unit Data
Panels:
6.0 Pre-wired yes
7.0 Floor-mounted yes
8.0 Steel sheet thickness mm ≥ 2
9.0 Protection class IP 52
10.0 Maximum height m 2.25
11.0 Door material glass
Bay units:
12.0 Spare units for additional bays Pcs.
1 spare for
each type of
Bay unit
provided
yes
13.0 Power supply from station battery V DC 110
Central Processing Units (PCU):
14.0 Microprocessor bus architecture bit 32/64
15.0 Memory for system software type PROM
16.0 Application software in battery-buffered
RAM or EPROM / Flash-PROM
yes
17.0 Automatic time synchronization at all
nodes of the network
yes
18.0 Fault indication LEDs on modules and
alarm messages on monitors
yes
19.0 Basic functions: logic, sequence control,
data processing, including code conversion,
text and alarm signal editing, and function
units for binary processes
yes
20.0 Cycle times, selectable (for each control
module)
ms 10, 20, 40, 50,
100, 200, 250,
500, 1000,
2000s
21.0 Programming language: Elements for
logic, control loops, arithmetic
yes
22.0 Minimum number of I/0 channels per
computer (analogue in / digital in / digital
out)
(see rel.
chapter)
23.0 Spare % 25
Video display and control system:
24.0 Power supply from station batteries V DC 110
25.0 Number of monitors for each control Pcs. 3
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
system
26.0 Number of function keyboards:
liquid-proof keyboard Pcs. 1
exchangeable extended keyboard Pcs. 1
27.0 Hardcopy printer Pcs. 1
28.0 Event and record printer Pcs. 2
29.0 Bus data channels Pcs. 1
30.0 Event list events min. 400
31.0 Alarm list alarms min. 100
32.0 Resolution:
within computer ms 1
between computers ms 5
33.0 External alarm outputs Pcs. 6
34.0 Diagramme change speed sec. 5
35.0 Diagramme updating:
event-driven sec. 1
cyclic, adjustable sec. 3 to 10
36.0 Transfer of manual command inputs sec. 1
Communication links:
37.0 Data transmission rate Mbit/sec. 10
38.0 Data transmission mode as serial bus to
IEEE 802.3 and CSMA / CD (Ethernet type)
yes
39.0 Conductor as duplex fibre optic cable yes
40.0 Data transmission rate Mbit/sec. 10
41.0 Number of buses per processing unit no. 2
42.0 Nodes per buses Pcs. max. 45
43.0 Transmission range (with fibre optic cable) m 1000
Programming and services unit (personal computer
or programming unit):
notebook or
personal com-
puter
44.0 Main processor type (or better) Pentium 166xx
45.0 Main memory Mbyte min. 512
46.0 Hard disc Gbyte min. 100
47.0 Floppy disc drive 3.5" Mbyte 1.44
48.0 Monitor type active LCD
49.0 Interfaces serial and par-
allel
50.0 Operating system OS, MS-DOS or
UNIX, Win-
dows, latest
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
version
51.0 Weight kg < 10
52.0 Ambient temperature:
Operation °C 15 - 50
Storage °C 0 - 60
Transport °C -30 - +60
Electromagnetic interference tests:
53.0 Insulation test, voltage test, individual test:
Applicable standards IEC 60255-5,
IEC 60950
Test voltage AC kV/Hz 2/50
or DC (1 minute) kV 2.85
external circuits against internal circuits
external circuits against earth and against earth
other
internal circuits against earth
54.0 Impulse voltage test, type test:
Applicable standards IEC 60255-5
Test level level III
Test voltage kV 5
External circuits against internal circuits µs pulse: 1.2/50
External circuits against earth
HF interference test, type test:
55.0 Applicable standard IEC 60255-22-1
56.0 Test level III
57.0 Test voltage (1 MHz attenuated, repeat
rate 400/sec.):
Common mode voltage kV 2.5
Differential voltage kV 1.0
Transient disturbance values / burst, type test
58.0 Applicable standard IEC 60801-2
59.0 Test voltage kV/ns 4, 5/50
60.0 Burst duration ms 15
61.0 Repetition time ms 300
Electromagnetic fields, type test
62.0 Applicable standards IEC 60801-3
IEC 60255-22-3
Electromagnetic discharges, type test
63.0 Applicable standard IEC 60801-2
64.0 Test conditions front door
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 84
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
closed, closed
panel (covered)
65.0 Sharpness 3
66.0 Test voltage kV 8
Electric meter
67.0 Basic current lb A 3 x 5
68.0 Load capacity in % of lb:
Metering 400
Thermal 500
Short circuit peak value of
50 lmax and >25
lmax during 1 µs
69.0 Rated voltage (Un) V 3 x 230 / 400
70.0 Rated frequency Hz 50
71.0 Accuracy class 0.2
72.0 No creep on voltage variation V 0.8 ÷ 1.15 Un
73.0 Starting load max. A 0.05% lb
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 85
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 28: Under Ground Cable
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Location of manufacturing site to be specified
Manufacture quality certification ISO 9001
Circuit rating required MVA 90
1.0 General description of cable
Number of cores 1
System voltage kV 132
Conductor size mm2
Insulation type XLPE
Metal sheath type Lead
Oversheath type HDPE
2.0 Insulation Cordination
Highest system Voltage (Um) (Insulation class) kV 145
Nominal Voltage between conductors kV 132
Rated frequency Hz 50
Nominal Voltage between conductor and sheath (Uo) kV 76.2
Rated Withstand impulse Voltage( altitude < 1000 M) kV 650
Rated short duration power frequency withstand voltage
(altitude < 1000 M)
kV 275
3.0 Rating 1
maximum continuous direct- buried current rating
assuming
Ground temperature of 30o C, Max. Soil Thermal
resistivity of 2.7Km/W, Flat formation configuration and
special bonding of metal sheath
Guaranteed current rating Single Trench
Calculation Method
A
To be specified
IEC
60840,60287
Maximum continuous in air current , assuming
Air Temperature (in shade) of 40oC, Flat formation
configuration spacing of 250mm, Thermally independent
of other circuits and special bonding of metal sheath
Calculation Method
A
To be specified
IEC 60840,
60287
maximum permissible core temperature for continuous
operation
oC 90
Sort circuit capacity for 1 sec kA To be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 86
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Permissible Max. sheath Temperature
Permissible Max. Conductor Temperature
oC
oC
Permissible emergency Overload
Applied on 100% continuous load
Emergency current rating
Max. Emergency temperature
Allowable duration/ operation
Allowable total duration/ operation
Max. average duration/average on total life of cable
A oC
Hours
Hours
Hours
to be specified
Applied on 50% continuous load
Emergency current rating
Max. Emergency temperature
Allowable duration/ operation
Allowable total duration/ operation
Max. average duration/average on total life of cable
A oC
Hours
Hours
Hours
to be specified
Applied on 100% continuous load
Emergency current rating
Max. Emergency temperature
Allowable duration/ operation
Allowable total duration/ operation
Max. average duration/average on total life of cable
A oC
Hours
Hours
Hours
to be specified
4.0 Construction features
Conductor
Material
Nominal cross section
Shape and type of conductor
Overall diameter
Water blocking method
Semi conductor blinder tape
mm2
mm
Aluminum
tape/yarn
yes
Conductor Screen
Material
Nominal Thickness
Minimum Thickness
Nominal overall diameter
Compound identification reference
mm
mm
mm
Fully bonded
Semicon. XLPE
yes
Insulation
Material
Nominal Thickness
mm
XLPE
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 87
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Minimum Thickness
Nominal overall diameter
Max. Continuos operating temperature
Compound identification reference
Maximum stress at nominal voltage
At conductor screen
At insulator screen
Maximum stress at impulse voltage
At conductor screen
At insulator screen
mm
mm oC
kV/mm
kV/mm
kV/mm
kV/mm
90
yes
Insulation screen
Material
Nominal Thickness
Nominal overall diameter
Compound identification reference
Indelible ink marking on screen
mm
mm
Fully bonded
Semicon. XLPE
yes
XLPE manufacturing methods
Extrusion line type e,g CCv,MDCV,VCV
Single pass/triple exclusion
Curing method
Cooling method
Degassing period
days
VCV
yes
dry
dry
Bedding for moisture absorption
Type of Material
Nominal Thickness
Mimimum thickness
Nominal overall diameter
mm
mm
mm
Metallic screen
Type and Material
Nominal Thickness
Mimimum thickness
Nominal diameter over screen
Cross sectional area of he screen
Short time current density(1sec)
mm
mm
mm
mm2
kA/mm2
Copper wire
Bedding/Binder tape
Type and Material
Nominal Thickness
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 88
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Mimimum thickness
Nominal overall diameter over bedding
mm
mm
mm
Metallic screen
Type and Material
Nominal Thickness
Mimimum thickness
Nominal diameter over screen
Cross sectional area of he screen
Short time current density(1sec)
mm
mm
mm
mm2
kA/mm2
lead-alloy ½ C
Protective anti corrosion external sheath covering
Bitumen undercoat
Type and material
Colour
Nominal thickness
Minimum thickness
Termite resistant
Type of anti termite protection
Thermal resistivity
Type of fire protection for closing section
mm
mm
Km/w
HDPE
Black
Yes
Specify max. 6.0
Type of conductive outer layer Graphite/or
semicon.
polymer
Weight of completed cable
Copper
Insulation
Lead alloy
Gross weight
Kg/m
Kg/m
Kg/m
Kg/m
to be specified
5.0 losses
Maximum dielectric loss per meter/ phase when operating
at nominal voltage frequency and at maximum conductor
temperature
W/m to be specified
Maximum sheath loss per meter/ phase when operating
at nominal voltage frequency and at current stipulated in
item 3 with sheath bonded and earthed as recommended
(sectionalising Cross bonding)
W/m to be specified
Maximum conductor loss per meter/ phase when
operating at nominal voltage frequency and at current
stipulated in item 3
W/m to be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Total loss of cable per metre/ phase of three phase circuit W/m to be specified
35.0 Electrical values
Maximum dc resistance of conductor at 20o C µΩ/m to be specified
Maximum ac resistance of conductor at operating
temperature C
µΩ/m to be specified
Equivalent reactance of three phase circuit µΩ/m to be specified
Electrostatic capacitance per conductor of cable at
nominal voltage and operating temperature
pF/m to be specified
Max. charging current per conductor at nominal voltage mA/m to be specified
Charging capacity of three phase system (at Uo) Var/m to be specified
Max. dielectric loss factor of cable at nominal voltage and
frequency at a conductor temperature of;
20 oC
90 o
C
to be specified
Positive and negative impedance Ω/m to be specified
Zero sequence impedance (as installed conditions)
Resistance
Reactance
Capacitance
Ω/m
Ω/m
pF/m
to be specified
Surge impedance Ω/m to be specified
36.0 Bonding and earthing
Type of special bonding
Max. sheath potential of completed cable with conductor
at max. earth fault current of 31.5 kA with sheath bonded
and earthed as recommended
V/m to be specified
Max. sheath potential of completed cable with conductor
at rated current with sheath bonded and earthed as
recommended
V/m to be specified
8.0 Testing
Routine tests
As per IEC 60840
Additional tests specified in Ketraco spec.
yes
Sample tests
5Uo for 1 hr ( as per Ketraco spec)
IEC 60840
Type tests
Test regime
Location of test
date of test
yes
Commissioning tests
AC voltage withstand
1.7Uo for 1 hour
< 10pC
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 90
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Partial discharge monitoring
Oversheath DC voltage test
kV 12kV for 15
minutes
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 91
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 29: 132 kV Isolators without Earthing Switches
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type to be specified
Installation outdoor
Rated maximum voltage kV 145
Rated service voltage kV 132
Rated lightning impulse (BIL)(at altitude less than 1000 M) kV peak 650
Power frequency withstand voltage (at altitude less than 1000 M) kV rms 275
Rated short-time current kA 31.5
Rated frequency Hz 50
Number of poles 3
Rated current A 1600
Minimum creepage distance mm/kV 31
Operation motorized
Opening time sec. ≤ 30
Closing time sec. ≤ 30
Rated peak withstand current kA 100
Minimum clearance in air:
Between poles mm 1600
To earth mm 1300
For isolating distance mm to be specified
Type of operating mechanism:
For disconnector motor
Rated supply voltage for operating mechanism V DC 110
Current required at rated supply voltage to operate isolator: A to be specified
Hand operating facility yes
Locking arrangement in Off and On yes
Automatic isolation of control supplies when lock off yes
Rated power of operating coil W to be specified
Rated Motor power W to be specified
Facing of terminals and contacts to be specified
Shape of terminals of the main circuit to be specified
Number and type of auxiliary switches:
Tin plated for Isolator Yes
For the disconnector 5 NO , 5 NC
Auxiliary contact rating A > 10
Wind load Pa
(N/mm²)
to be specified
Mechanical terminals load:
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Straight load N 500
Cross load N 170
Weight of complete disconnector:
With earthing switch kg to be specified
Without earthing switch kg to be specified
Approximate dimensions in open position mm to be specified
Approximate dimensions in close position mm to be specified
With all accessories for installation to be specified
Applicable Standard(s) IEC 62271-102
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
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Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Table 30: 33 kV Isolators without Earthing Switches
Minimum Requirements Data offered by
Bidder Description Unit Data
Manufacturer to be specified
Type to be specified
Installation outdoor
Rated maximum voltage kV 36
Rated service voltage kV 33
Rated lightning impulse (BIL)(at altitude less than 1000 M) kV peak 170
Power frequency withstand voltage (at altitude less than 1000 M) kV rms
70
Rated short-time current kA 25
Rated frequency Hz 50
Number of poles 3
Rated current A 800
Hand operating facility yes
Locking arrangement in Off and On yes
yes
Automatic isolation of control supplies when lockoff yes
yes
Rated power of operating coil W
Rated Motor power W
Minimum creepage distance mm/kV 31
Operation motorized
Opening time sec. ≤ 30
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 94
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Closing time sec. ≤ 30
Rated peak withstand current kA 100
Minimum clearance in air:
6.0 Between poles mm 500
7.0 To earth mm 435
8.0 For isolating distance mm to be specified
Type of operating mechanism:
9.0 For disconnector Motorised
Rated supply voltage for operating mechanism V DC 110
Current required at rated supply voltage to operate isolator: A to be specified
Facing of terminals and contacts to be specified
Shape of terminals of the main circuit to be specified
Number and type of auxiliary switches:
10.0 For the disconnector 5 NO , 5 NC
Auxiliary contact rating A > 10
Wind load Pa
(N/mm²)
to be specified
Mechanical terminals load:
11.0 Straight load N 500
12.0 Cross load N 170
Weight of complete disconnector:
13.0 With earthing switch kg to be specified
14.0 Without earthing switch kg to be specified
Republic of Kenya Lot 3A Substation Technical Schedules –Substations Kenya Electricity Transmission Company
Page | 95
Kenya Power Transmission System Improvement Project PROJECT NO: P- KE-FA0-004-5083020 | March 2012
Minimum Requirements Data offered by
Bidder Description Unit Data
Approximate dimensions in open position mm to be specified
Approximate dimensions in close position mm to be specified
With all accessories for installation to be specified
Applicable Standard(s) IEC 62271-102
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