(i) 11KV & 33 KV METERING UNIT

GROUP- R & S

(TECHNICAL SPECIFICATIONS & GTP FORMATS)

(i) 11KV & 33 KV METERING UNIT

(ii) 11KV & 33KV METERING CUBICLE

SCHEDULE OF MATERIALS:

Sl. No. Name of the Materials Unit Quantity

1 11KV Metering Unit (CTR = 10/5A) No 200


















19 11KV Metering Cubicle(CTR = 10/5A) No 150
















Metering Unit (MU)

Sl. No.

MU with CT Ratio Quantity(in Nos)

1 11KV 3Ph 4W CT/PT combined Metering Unit CT Ratio- As above PT Ratio – 11000/110V (Accuracy Class – 0.5)

700

2 33 KV 3Ph 4W CT/PT combined Metering Unit CT Ratio- As above PT Ratio – 33000/110V (Accuracy Class – 0.2)

135

Metering Cubicle (MC)

Sl. No.

MC with CT Ratio Quantity(in Nos)

1 33 KV Pilfer Resistant Metering Cubicle suitable for 3 phase 4 wire Indoor installation comprising of 3 number of Single Phase epoxy resin cast CT‟s & 3 number of Single Phase epoxy resin cast PT having specification : CT’s PT’s Accuracy Class : 0.2 Ratio : As below. 33 kv/110 volts / √3

Burden : 15 VA 50 VA

Phase : 1-ph. 1-ph. C.T‟s in conformity with IS : 2705 (Part-I & II)/1992, Second Revision & P.T‟s in conformity with IS : 3156 (Part – I & II) /1992 , Second Revision. M.S sheet used in Cubicle will be of 2 mm. thickness. C.T Ratio: 5/5 Amp - 400/5 Amp

100

2 11 KV Pilfer Resistant Metering Cubicle suitable for 3 phase 4 wire Indoor installation comprising of 3 number of Single Phase epoxy resin cast CT‟s & 3 no. of Single Phase epoxy resin cast PT having specification : CT’s PT’s Accuracy Class : 0.5 Ratio : As below. 11 KV/110 volts/ √3 Burden :5/10 VA 15 VA Phase : 1-ph. 1-ph. C.T‟s in conformity with IS : 2705 (Part-I & II)/1992, Second Revision & P.T‟s in conformity with IS : 3156 (Part – I & II)/1992, Second Revision. M.S sheet used in Cubicle will be of 2 mm. thickness. C.T Ratio: 10/5 Amp - 50 /5 Amp

290

TECHNICAL SPECIFICATION FOR 11KV & 33 KV METERING UNITS

1. SCOPE:

This specification covers design, engineering, manufacture, assembly, stage testing, inspection, testing before dispatch, supply and delivery of 11KV & 33KV CT PT Combined Metering unit Sets of class of accuracy 0.5 for 11 KV MU, 0.2 for 33 KV MU as per the particulars given in the schedule attached.

2. STANDARD: Except where modified by this specification the component parts of the equipment shall comply with the following ISS available ( the latest versions).

Current Transformers : IS 2705/1992

Potential Transformers : IS 3156/1992 HV Porcelain Bushing : IS 2099/1986 Oil : IS 335/1983 Galvanization : IS 2633 Primary Terminals : IS 10601 Oil : IS 335

3. TYPE FOR 11 KV: The metering transformer equipment should be of pole mounting type for

outdoor use. They are to be used in 11KV Three Phase with solidly earthed neutral and suitable for 3 Phase 4 Wire 50 cycles network. The equipment is required for operation of HT Trivector Meters and should be oil cooled.

The CTPT sets shall have the following ratings:

i) Rated Voltage: 11 KV ii) Highest system voltage: 12 KV iii) Insulation level: 12 KV iv) Standard Impulse withstand voltage: 75 KV Peak v) One minute power frequency withstand Voltage

a. Primary: 28 KV b. Secondary: 3 KV

vi) Short time thermal current and its duration 1. 6 KA for 1 sec for CT ratio below 50/5 A 2. 1 3 .1 K A for 1 sec for CT ratio = 50/5 A(including 50/5 A)

vii) Class of Accuracy: 0.5 (Negative (-ve) errors will not be acceptable.)

viii) Rated burden per phase

1. For CTs: 15 VA 2. For PTs: 50 VA

ix) Frequency: 50 HZ

x) Maximum attainable winding temperature =80 deg C

xi) Minimum Phase to Phase distance=255 mm

xii) Shortest distance between metal part & earth = 190mm

xiii) Creepage distance of HV bushing 300mm (Min)

xiv) Gauge of MS Tank Min 5mm for top & bottom cover & 3.15 mm all other sides.

xv) Entire tank shall be hot dip galvanized.

xvi) Bi-metallic terminal connector with a nut, plane washer, spring washer & Check nut

suitable for aluminum conductor required for different rating of metering units.

Six nos. to be provided with each metering units.

4. TYPE FOR 33 KV: The metering transformer equipment should be of pole mounting type for

outdoor use. They are to be used in 33 kV Three Phase with solidly earthed neutral and suitable for 3 Phase 4 Wire 50 cycles network. The equipment is required for operation of HT Trivector Meters and should be oil cooled.

The CTPT sets shall have the following ratings.

i) Rated Voltage: 33 KV

ii) Highest system voltage: 36 KV

iii) Insulation level: 36 KV

iv) Standard Impulse withstand voltage: 170 KV peak

v) One minute power frequency withstand Voltage

a. Primary: 70 KV

b. Secondary: 3 KV

vi) Short time thermal current and its duration

1. 6 KA for 1 sec for CT ratio below 50/5 A

2. 13.1 KA for 1 sec for CT ratio for > 50/5 A (including 50/5A)

vii) Class of Accuracy: 0.2 (Negative (-ve) errors will not be acceptable.)

viii). Rated burden per Phase

1. For CTs: 5 VA up to 50/5 A & 10 VA for => 50/5 A

2. For PTs: 50 VA

ix). Frequency: 50 HZ

x). Maximum attainable winding temperature =80 deg C

xi). Minimum Phase to Phase distance=430 mm

xii). Shortest distance between metal part & earth = 380 mm

xiii). Creepage distance of HV bushing 900mm (Min)

xiv).Thickness of MS Tank Min 5mm for top cover & 3.15 mm bottom & all other side.

xv). Entire tank shall be hot dip galvanized.

xvi). Bi-metallic terminal connector with a nut, plane washer, spring washer & check nut suitable

for aluminium conductor required for different rating of metering units. Six nos to be provided with

each metering units.

5. DESIGN:

a) The equipment shall be designed to ensure satisfactory operation under all conditions

of service to facilitate easy inspection, cleaning and repairs.

b) The design shall incorporate every reasonable precaution and provisions for safety of all

those concerned in the operation and maintenance of the equipment. A pressure relief valve shall be invariably provided to the CTPT set. It shall be provided at the top cover of the tank.

c) All outdoor apparatus shall be so designed that water cannot collect at any point and enter the

CT/PT set. The top cover of the tank, secondary terminal cover, inspection chamber cover plate is suitable bent at the edges (at least 25mm bent) so that the gaskets are not exposed to moisture.

d) All connections and terminals shall be of sufficient size for carrying the specified currents

continuously without undue heating.

e) All bolts, nuts, washers in contact with non-ferrous parts shall be of brass.

f) All ferrous parts including bolts & nuts liable to corrosion, forming integral part of the

equipment shall be smoothly and continuously hot dip galvanized.

g) The secondary terminal box, inspection cover and oil gauge shall be arranged with MU.

h) The core shall be high grade non-ageing electrical silicon laminated steel or of better grade of low hysteretic loss and high permeability to ensure high accuracy, at both normal and over current/ voltage.

i) All winding shall be of insulated high grade Electrolytic copper wire and the manufacturing of the units shall be done in completely closed and air- conditioned room otherwise Fibre glass insulation sleeves are to be provided for primary winding. Details of winding and core shall be furnished.

j) The CTPT set should have Three CTs and Three PTs with star / star

connection.

6. SEALING:

Sealing bolts for sealing at 4 points on the secondary terminal box (both inner & outer door), inspection cover, the top cover of the tank shall be provided. This may be made by providing a hole on tail of corner bolts of adequate size to pass the sealing wire or above13 SWG.

7. FLUCTUATION IN VOLTAGE AND FREQUENCY : For continuous operation, entire

equipment shall be subjected to variation of voltage up to plus 20 minus30 percent and frequency of plus or minus 5 percent.

8. INSTRUMENT TRANSFORMERS:

a) The voltage and current transformers shall have normal continuous rating as per the schedule of requirement.

b) The voltage transformer shall be so designed that the increased magnetizing currents due to any persisting over voltage, does not produce injurious over heating Phase barriers shall be provided.

c) The peak value of the rated dynamic current shall not be less than 2.5 times the rated short

time thermal current unless stated otherwise. (4.62 of ISS: 2705/Part-I of 1992, latest version).

d) Modified polyester enamel copper wire is to be used for winding and it shall conform to IS-4800/Part-V (latest version).

e) The terminals of the instrument transformer shall be clearly marked by distinctive letters as

stated in Annex “C” of ISS: 3156/Part.I/1992 (latest version) for voltage transformer and Annex “C” of IS-2705/Part.I/1992 (latest version) for current transformers.

f) The winding shall be neatly laid and anchored.

g) The metering set tank and other metal parts shall be galvanized both inside &

outside as per latest IS applicable.

9. INCOMING SIDE:

a) TERMINALS: Brass rods 12mm dia for Primary and 6 mm dia for secondary. b) Bushing for outgoing side of CT/PT set :

The porcelain portion of HT bushings shall be of standard make and conform to IS- 2099/1996.

The dimensions of the bushings shall conform t o I S - 33 4 7 /Part.III/19 The minimum phase-to-phase clearance shall be as per IS.

The tests as per IS-2099/1962 shall be conducted on the transformer bushings as detailed below:

a) Dry flash over voltage. b) Wet flashover voltage. c) Dry 1 Min. withstand volt. d) Impulse withstand voltage (1.2/50 Micro Seconds –ve wave)

e) Manufacturer‟s test certification may be furnished for every lot of offer.

The bushings shall be of reputed manufacturers like M/s. Jayashree Insulators, M/s. WS Industries, M/s. BHEL,M/s. Allied Ceramics, M/s. India Potteries and M/s. IEC which are having complete testing facilities.

The bushing stems shall be provided with suitable bimetallic connectors so as to connect the jumper without disturbing the bushing stem.

f) The bush rod stem length should be at least 40 mm and 3 nuts with

2 flat washers of brass material should be provided with each bush rod.

10. STEEL TANK:

a) The oil filled container incorporating the voltage transformers and

current transformers should be fitted with incoming and outgoing primary terminals and secondary terminal box. The secondary terminal box shall be arranged on sides. The general arrangement drawing with 3 bushing on the incoming side and 3 bushings on the outgoing side shall be submitted along with tender.

b) The tank shall be built with a plate of 5 mm thick top and 3.15 mm sides and

bottom and with all fittings shall be capable of withstanding without leakage or distortion at the standard test pressure. All joints of the tank and fittings shall be hot oil tight and no leakage should occur during service.Both side of the joint should have continuous welding.

c) It shall be provided with an oil gauge as shown. The oil gauge glass shall be

fixed to the side of the raised wall of the inspection box.

The tank shall be provided with necessary lifting lugs. Tank including top cover shall be hot deep Galvanized.

d) The secondary terminal box cover, tank cover and inspection cover and other vertical joints where gaskets are used shall be suitably bent at least 25 mm bent with necessary sealing arrangement with sealing bolts at all corners and bolts should be at least 10 mm diameter GI bolts spaced maximum 70 mm apart. This is to safeguard against seepage of water into tank in case of damaged gasket.

e) The 6 mm gaskets shall be dovetailed without joints to prevent moisture

entry. In case of dovetailed joint, they shall not be more than two. The gaskets shall be of good quality Neoprene or superior quality rubberized gasket.

f) EARTHING:Two earthing terminals shall be adequate size protected

against corrosion and metallically clean and identified by means of the sign marked in a legible and indelible manner on or adjacent to the terminals.

g) All bolts should be provided with 2 flat washers and a spring washer with a nut.

h) Conservator should not be provided for these CTPT sets.

i) The Secondary terminal box incoming hole should be 32 mm diameter and at a suitable height from bottom to avoid replacement/ modification of secondary wires pipe when CTPT set is replaced. The secondary terminals size should be 6 mm diameter, 25 mm stem length, 2 flat washers with 3 nuts of brass material should be provided. The terminals should be provided at least 70 mm height from incoming hole and clearances shall be as per IS to avoid shorting terminals due to secondary wires pipe.

j) Secondary chamber shall have double door (inner & outer) with

suitable arrangement for sealing of both the doors. The inner door shall be of transparent Polycarbonate so that secondary terminal connections can be viewed without breaking the inner door seals.

k) The following details of equipment shall be engraved on tank with at least 1 0 mm letters.

1. Make 2. Ratio 3. Class of accuracy 4.Serial No: 5. Month & year of manufacturing 6 . Property of NESCO

l) 66 months guarantee embossed plate shall be welded opposite side of name plate.

11. MOUNTING ARRANGEMENT:

The under base of all CTPT sets shall be provided with two 75x40mm GI channels and foundation dimensions shall be suitable placing with tank base uniform for all sets with only ±2 mm tolerance, to avoid modification of structure / plinth, whenever CTPT set is replaced

12. OIL: The insulation oil used in the tank shall comply with the requirements specified in latest relevant IS: 335/93 and as per Annexure-C.

13. GUARANTEED TECHNICAL PARTICULARS:

The Technical Particulars as specified in IS shall be guaranteed. Every tenderer should furnish the particulars required and guarantee the values so furnished for the supplies.

14. TESTS:

TYPE TESTS: The equipment offered shall be fully type tested from recognized standard govt. national laboratory by the bidder as per the relevant standards. The bidder shall furnish three copies of type test certificates with the bid (for 0.5 ACU, 11kv & 0 . 2 A C U , 33kv MU). These type test certificates shall be furnished along with tender documents. The bidders also furnish type test certificates for bushings and oil along with the Bid. The type test certificates shall be not older than (5) years.

TYPE TESTS FOR CTs:

a) Verification of terminal marking and polarity b) Short time current Test. c) Temperature rise test. d) Lightning Impulse test e) High Voltage Power frequency wet withstand voltage test. f) Determination of errors or other characteristics according to the requirements

of the appropriate designation or accuracy class.

TYPE TESTS FOR PTs: a) Verification of terminal marking and polarity. b) High voltage Power frequency wet withstand voltage test. c) Power frequency dry withstand tests on Primary winding.

Power frequency dry withstand test on Secondary winding. d) Determination of errors according to the requirements of the appropriate accuracy class. e) Temperature rise test.

f) Impulse Voltage test. g) Lightning Impulse test

TYPE TESTS FOR TRANSFORMER BUSHINGS:

a) Dry flash over voltage.

b) Wet flash over voltage. c) Dry 1 Minute withstand voltage. d) Impulse withstand voltage (1.2/50 Micro Seconds –ve wave)

ACCEPTANCE AND ROUTINE TESTS: The following shall be conducted as per IS: 3156 (Latest version).

a) Verification of Terminal marking and polarity.

b) Power frequency/ dry withstand tests on primary windings.

c) Power frequency dry withstand tests on secondary windings.

d) Determination of errors according to the requirements of the appropriate accuracy class.

e) Temperature rise test.

f) Air pressure test on empty tank of M U opened for verification test (One for every lot offered

for pre-dispatch inspection)

All acceptance and routine tests as stipulated in the relevant standards shall be

carried out by the supplier in presence of purchaser’s representatives.

Immediately after finalization of the programme of acceptance/ routine

testing, the manufacturer shall give advance intimation to the purchaser, to enable

him to depute his representative for witnessing the tests.

15. DRAWINGS AND LEAFLETS (along with tender):

Two sets of drawings showing clearly the general arrangements, sectional views, fitting details, electrical connections, foundation details, overall dimensions and design features of each component part should accompany the tender. The bidder has to submit clear & detail drawing with description how he will arrange the double door system in secondary chamber with sealing. Technical leaflets giving the operating instructions should also be furnished along with tender. Tenders without details are liable to be rejected. Literature and drawings are to be sent along with each equipment while dispatching, after approval by this office.

16. DEVIATIONS:

The deviations between these CTPT sets and NABL approved Standard Lab (CPRI, ERDA, etc.,) type tested CTPT set along with detailed reasons for deviations if any shall be submitted along with tender.

17. TOLERANCES:

Unless otherwise specified herein the test value of the transformers supplied should be within the tolerance permitted in the IS on the guarantee values.

18. SEALING OF CTPT SETS AFTER TESTING AND INDIVIDUAL TEST REPORTS:

After witnessing testing on sample quantity and physical inspection of all offered CTPT sets, the purchaser‟s representative will provide numbered plastic seal bits to two opposite corners of tank, Secondary Chamber and inspection cover of all

offered CTPT sets, for delivery of correct inspected materials only. The manufacturer has to provide test report duly mentioning all test results, seal bit numbers and name & address of purchaser’s representative after inspection is over. The seal bit numbers shall also be mentioned in the test reports signed by purchaser’s representative submitted for delivery instructions.

19. INSPECTION AND TESTING OF TRANSFORMER OIL:

To ascertain the quality of transformer oil the manufacturer’s test report should be submitted at the time of inspection. Arrangements should also be made for testing the transformer oil, after taking out the samples from the manufactured CTPT sets and tested in the presence of NESCO representative (or) if desired, in an independent laboratory.

20. DEPARTURE FROM SPECIFICATION:

If the tenderer wishes to depart from this specification in any respect, he shall draw the attention to such points of departure explaining fully the reasons therefore. Unless this is done the requirements of this specification will be deemed to have been accepted in every respect.

21. NAME PLATE: -

The Purchase order No. and Date of purchase order, the words “PROPERTY OF NESCO on the Name Plate. The name plate shall be non-detachable type & fixed

with rivets, not with bolts& nuts. The nameplate should bear year &

month of manufacture& other data as per IS. Space should be provided to punch the

date of installation by user group.

22. WARRANTY:

The supplier will warrant for the satisfactory functioning of the material / equipment as per specification for a minimum period of 66 months from the date of dispatch of the material / equipment in good condition indicating GP covering date upto --------------

23. The tenderer shall indicate the source of all materials. He shall also indicate the

name of the supplier and make of conductor, Transformer oil Electrical Steel Laminations, Construction Steel etc.

24. FITTINGS: The following standard fittings shall be provided.

a) Rating and terminal marking plates non detachable -1no. b) Earthing terminals with bolt, nuts & washers for connecting earth wire - 2Nos. c) Lifting lugs -4Nos.for main tank and 2Nos. for top cover. d) Pressure relief valve. – 1 no. e) Bimetallic terminal connectors on the HV bushings – 6 Nos.

f) HV bushings Outdoor – 6 Nos.

g) Secondary terminals bushings – 10 Nos h) Base channels 75 x 40 mm. i) 66 months guarantee embossed plate welded to tank opposite side of name plate. J) Tank and over all dimensions.

k) Weight content of a) core b) windings c) tank & fittings d) weight/qty. of oil e) over all weight.

Sl no

Particulars

Requirement Offered By

BIdder

1 Maker’s name & address To be indicated

2 Manufacturer’s Type & Design To be indicated

3 Type of cooling To be indicated

4 Nominal System Voltage 11 KV

5 Highest System Voltage 12 KV

6 Frequency. 50 HZ

7 Specification of CT & PT of Metering Unit

A Current Transformer

i Type Oil immersed

ii Accuracy Class 0.5

iii Rated output 15 VA

iv Insulation level 28KVrms/ 75 KVpk

v Short time thermal current rating for 3 sec

CT Primary 6 KA for 1< 50/5A & 13.1KA for 1sec for =>50/5A

vi Saturation factor To be indicated

vii Normal current density of primary winding =<1.6 Amps per Sq.mm

Knee Point Voltage To be indicated

Continuous percentage over load 120%

ISF As per IS

B Potential Transformer

i Type Oil immersed

ii PT ratio 11 KV/√3V /110/ √3V

iii Rated output VA/phase 50

iv Class of accuracy 0.5

v Insulation level 28KVrms / 75 KVpk

vi Winding connection Star/Star

vii Rated voltage factor & duration To be indicated

8. Dimension of MS hot dip Galvanized tank

a Height mm

To be indicated

b Breadth mm

c Length mm 9. Thickness of MS Tank

Side walls, Bottom 3.15mm

Top 5 mm Edge bending in the Top Cover To be provided Standard pressure & duration that can To be indicated

10. Weight of core and winding A. Current transformer

i Core To be indicated in separate sheet for each rating

ii Primary winding iii Secondary winding

Bid Specification/NESCO/Metering Unit

GUARANTEED TECHNICAL PARTICULARS OF OUTDOOR OIL IMMERSED 11 KV MU (CT: PT UNITS). (To be submitted along with TECHNICAL BID)

B. Potential transformer

i Core To be indicated

ii Primary winding iii Secondary winding

11. Quantity of oil in Ltr ( Min 35 Ltrs) To be indicated

Grade of Oil To be indicated 12. Total weight of complete ME including

all accessories and oil To be indicated

13 Resistance of primary & secondary winding per phase at 75° C:-

a CT Winding (i) Primary To be indicated in separate sheet for each rating

(ii) Secondary

b PT Winding (i) Primary To be indicated (ii) Secondary To be indicated

14 Maximum attainable winding temperature

85° C

15 a Minimum phase to phase distance 255mm

b Shortest distance between metal part & earth

190 mm

16 a Make & type of HT bushing

To be indicated

b Creepage distance of HV bushing 300mm (Min)

Bi-metallic terminal connector with nut, plain washer, spring washer & check nut suitable for aluminum conductor as

6 nos to be provided

18 eypeCTofrcot regmaterial To be indicated

19 Type & thickness of gasket used on a Top cover tank To be indicated b Secondary terminal box To be indicated c HV bushing To be indicated

20 Details of Metering Unit A CT details

a Cross section area of each turn of CT winding (in sq. mm.) i. Primary winding To be indicated in separate sheet for each

rating

ii. Secondary winding b. No. of turns

i. Primary winding To be indicated in separate sheet for each

rating

ii. Secondary winding c. Winding material i. Primary winding To be indicated ii. Secondary winding To be indicated

B PT details a Cross Section area of each turn of PT (in sq. mm.) i. Primary winding To be indicated ii Secondary winding To be indicated

b Number of turns i. Primary winding To be indicated

a Incoming RM, YM, BM

b Outgoing RL, YL, BL ii Secondary terminals a CTs 1s1- 1s2, 2s1-2s2, 3s1-3s2

b PTs r,y,b,n

22 Size and material of

i. Primary studs M12

jj Secondary studs M6

23 Secondary Chamber shall have double door type & sealing arrangement in both the doors.

To be provided

ii Secondary winding To be indicated c Winding materials i. Primary winding To be indicated ii Secondary winding To be indicated

21 Identification/marking of i. Primary terminals

Bidder’s Signature with Seal

Sl. no Particulars Requirement Offered

1 Maker‟s name & address To be indicated 2 Manufacturer‟s Type & Design To be indicated 3 Type of cooling To be indicated 4 Nominal System Voltage 33 KV

5 Highest System Voltage 36 KV 6 Frequency. 50 HZ 7 Specification of CT & PT of Metering Unit

A Current Transformer

i Type Oil immersed ii Accuracy Class 0.2 iii Rated output 5VA for up to 50/5 A,10

VA for =>50/5 A

iv Insulation level 70KVrms/ 170 KVpk.

v Short time thermal current rating for 3 sec

CT Primary 6 KA for < 50/5A & 13.1 KA

=> above 50/5 A. V

vi Saturation factor To be indicated vii Normal current density of primary

winding =<1.6 Amps per Sq.mm

Knee Point Voltage To be indicated Continuous percentage over load 120% ISF As per IS

B Potential Transformer i Type Oil immersed ii PT ratio 33KV/√3V/110/ √3V

iii Rated output VA/phase 50 iv Class of accuracy 0.2 v Insulation level 70KVrms/

170 KVpk

vi Winding connection Star/Star vii Rated voltage factor & duration To be indicated

8. Dimension of MS hot dip Galvanized tank a Height mm To be indicated b Breadth mm c Length mm

9. Thickness of MS Tank Side walls, Bottom.

3.15mm

Top 5 mm Edge bending in the Top Cover To be provided Standard pressure & duration that can be To be indicated

10. Weight of core and winding

GUARANTEED TECHNICAL PARTICULARS OF OUTDOOR OIL IMMERSED 33 KV MU (CT: PT UNITS) (To be submitted along with TECHNICAL BID)

withstand.

A. Current transformer i Core To be indicated in

separate for each rating

ii

Primary winding iii

Secondary winding

B. Potential transformer i Core To be indicated ii

Primary winding iii

Secondary winding 11. Quantity of oil in Ltr To be indicated

Grade of oil To be indicated 12. Total weight of complete ME including all

accessories and oil To be indicated

13 Resistance of primary & secondary winding at 75° C per phase :- a CT Winding (i) Primary To be indicated

(ii) Secondary To be indicated b PT Winding (i) Primary To be indicated

(ii) Secondary To be indicated 14 Maximum attainable winding temperature 85° C

15 a Minimum phase to phase distance 430mm b Shortest distance between live part &

earth 380mm

16 a Make & type of HT

bushing To be indicated

b Creepage distance of HV bushing 900mm (Min) 17 Bi-metallic terminal connector with nut, plain

washer, spring washer & check nut suitable for aluminum conductor as per CT rating.

6 nos to be provided

18 Type of core material To be indicated 19 Type & thickness of gasket used on

a Top cover tank To be indicated b Secondary terminal box To be indicated c HV bushings To be indicated

20 Details of Metering Unit A CT details

a Cross section area of each turn of CT winding (in sq. mm.) i. Primary winding To be indicated

ii. Secondary winding To be indicated b. No. of turns

i. Primary winding To be indicated ii. Secondary winding To be indicated c. Winding material i. Primary winding To be indicated ii. Secondary winding To be indicated

B PT details a Cross Section area of each turn of PT (in sq. mm.) i. Primary winding To be indicated ii Secondary winding To be indicated

b Number of turns i. Primary winding To be indicated ii Secondary winding To be indicated

c Winding materials i. Primary winding To be indicated

23 Secondary Chamber shall have double door type & sealing arrangement in both the doors.

To be provided

ii Secondary winding To be indicated 21 Identification/marking

i. Primary terminals a Incoming RM, YM, BM b Outgoing RL, YL, BL ii Secondary terminals a CTs 1s1- 1s2, 2s1-2s2,

3s1-3s2

b PTs r,y,b,n 22 Size and material of

i. Primary studs M12 jj Secondary studs M6


GUARANTEED TECHNICAL PARTICULARS FOR OIL

(To be submitted along with TECHNICAL BID)

Sl.No Characteristic. Particulars To be furnished

by the Bidder

1. Appearance. The oil shall be clear and transparent and free

from suspended matter or sediments and should conform to IS-335/93 or latest versions.

2. Density at 27 degrees C (max) 0.89 g/cm.

3. Kinematic Viscosity at 27 degrees C (max) 27 CST.

4. Interfacial Tension at 27 Degrees C (max) 0.04 N/M.

5. Flash point, pensky – marten (closed) (min) 140 Degrees C.

6. Pour point (max) -10 Degrees C.

7. Neutralisation Value: a) Total acidity (max)

b) In-organic acidity alkalinity. 0.01. Nil

8. Corrosive sulphur. Non-corrosive.

9. Electric Strength (breakdown voltage/ minute)

a) New unfiltered oil. 50 KV (rms) b) After filteration. 50 KV (rms)

10. Dielectric dissipation factor

(Tan delta at 90 Deg. C (min)).

11. Specific resistance (Resistivity).

a) At 90 Deg. C (min) b) At 27 Deg. C (min)

12. Oxidation stability a) Neutralisation value after oxidation (max) b) Total sludge after oxidation (max)

13. Ageing characteristics after accelerating ageing (open breaker method with copper catalyst) for 96 Hrs.as per ASTM D. 1934- 1978) a) Specific resistance (Resistivity)

0.005.

30x1012

ohms- cm.

500x1012

ohms-cm 0.2 mg KOH/g 0.05% by Weight.

a. At 27 Deg. C (min)

b. At 90 Deg. C (min)

b) Dielectric dissipation factor Tan delta at 90 Deg. C (max)

c) Total sludge value (max) d) Total acidity (max)

2.5 X 1012

ohms-cm

0.20 X 1012

ohms-cm 0.20 0.5 0.5

14. Presence of oxidation inhibitor. Nil 15. Water content (max) 50 ppm

THE ABOVE PARTICULARS ARE HEREBY GUARANTEED. Name of the Firm :

Signature :

Designation :

Date :

SCHEDULE OF BIDS FOR TECHNICAL


1. Name of tenderer with Office and factory address: Tel.No./Telex No./Fax No. 2. Specification No. 3. Address of Local Office and Tel.No./Telex/Fax No. : 4. Tenderer’s Reference No. : 5. Last date and time of submission of Tender : 6. Date and time for opening of Tender : 7. Testing Facilities available : 8. Category of organization : 9. Whether qualifying certificates submitted : 10. Particulars of Earnest Money submitted : 11. Whether NESCO delivery clause accepted : 12. Whether agreed to :

a) Inspection Clause : b) Packing Clause : c) Retesting Clause :

13. Whether the material/equipment offered conformed to the relevant ISS specification and drawing.

14. Whether executed orders previously for the items tendered now. Please give full details of supplies made.

15. Whether the product bears ISI mark 16. Offer valid up to :

17. Delivery Schedule : a) Commence with minimum quantity : b) Rate of delivery per month/quarter :

And completion time 18. If any deviation, please mention in deviation :

Sheet enclosed. 19. Technical literature/catalogue of the :

Materials offered enclosed.

20. Manufacturer’s supply experience

including user’s certificate furnished or not. :

21. Type test certificate from any NABL ACCRIDETED Testing

Laboratory, Govt. of India :

23. Whether Guaranteed Technical Data Sheet Particulars submitted.

Signature of Bidder With Name and Seal of company

(This form is to be duly filled up and duly signed by the Bidder & submitted along with the tender.)

TECHNICAL SPECIFICATION FOR 33KV & 11KV PILFER RESISTANT METERING CUBICLE

A) Technical specification of 11 KV Pilfer resistant metering cubicles for 3

phase, 4 wire metering system (with various CT ratio of accuracy class-0.5).

1) General :- This specification covers the design, manufacture, testing and supply of 11 kV

floor mounting indoor type metering cubicle having 3 nos single phase CTs and 3 nos single

phase PT but without meter. The tenders from only such firms shall be accepted who

themselves manufacture metering cubicles of the relevant design conforming to IS 2705

(part-I & II) and IS 3156 (part-I & II) respectively and have obtained type test certificates.

2) Construction

The metering panel shall be fabricated with 2mm MS plate and shall have external dimensions

of 1600x750x700mm (height x width x depth) (approx). Height of panel is fixed but width &

depth is minimum and may be increased suitably to accommodate CTs/PTs, if required. Thus,

total height including base channel will be 1700 mm. The panel should be provided with 4 Nos.

lifting hooks.

The panel shall be dust and vermin proof and totally enclosed. The panel shall have two

separate compartments. The upper one shall house trivector meter, energy meter and check

energy meter with associated wiring and shall be termed as “Meter compartment”. The upper

compartment will be double door type and the arrangement for meter fixing will be in inner

portion. The other section i.e. lower compartment shall house the 11 KV,1 Ph, dry type epoxy

resin casted CT (3 Nos.) and 11 KV,1 Ph, dry type epoxy resin casted PT (3 Nos.) and shall be

termed as “HT CT/PT compartment”. A separate and independent vermin proof

door shall be provided for each of the upper and lower compartments with provision of

locking and sealing arrangement.

The Metering cubicle shall be totally enclosed and shall be provided with one no. hinged door

made of MS sheet which shall rest on the collar along r sides of cubicle so that the doors

remain flushed with body of the cubicle.

The door shall be provided with a handle and two no‟s sealing arrangement. There shall be

one fixed (non-openable) window (approximate size 300 x 200mm) fitted with transparent

acrylic glass to enable the meter reader to note down the reading without opening the door of

the panel. The glass shall be fitted / tightened with MS Frame from inside of window.

The metering panel shall be provided with two Nos. MS channels of size 100x 50 mm of 750

mm length on the front and rear sides duly welded at the bottom of the panel. These shall have

4 holes of 16 mm for foundation bolts at both the ends of each channel. All the joints of the

metering panel shall be welded to provide strong mechanical construction both for

transportation as well as during its use. The metering panel shall have arrangement to connect

it will earth at two independent points. One earthing knob /bolt shall also be provided in the

“Meter compartment” for connection to star point of wiring. All the three earthing bolts shall be

provided with nuts and washers.

The metering panel shall be cleaned suitably and will go through phospating using seven tank

dipping procedure and its surface shall be made smooth. It shall be powder coated as per

relevant IS specification. The colour of paint shall be decided at the event of order. Height of

panel is fixed but width & depth is minimum and may be increased suitably to accommodate

CTs/PTs, if required. Thus, total height including base channel will be 1700 mm. The panel

should be provided with 4 Nos. lifting hooks.

All the moving/mating edges shall be provided with synthetic/semi synthetic gasket firmly glued

to surface, to make the metering panel dust & vermin proof. The metering panel shall be

provided with two cable entries inside from bottom along with glands /gland plate for 11 kV

XLPE cable of various sizes corresponding the CTS ratio and Short Circuit Current Rating

without cable boxes. However, the provision for clamping of HT cable boxes has to be

provided. There should be suitable provision so that cables boxes along with cable can be

taken out of the panel without damage.

The meter compartment shall contain hanger arrangement of slotted angle for mounting main

meter and check meter having flexibility for moving meters vertically or horizontally. Clearances

between all parts and components of panel should comply with relevant ISS standard, which

shall be checked by NESCO.

3) Sealing:-

The metering cubicles shall be completely lockable and sealable with at least one locking

and two sealing arrangements of the door of each compartment. Apart from sealing

arrangement of both compartments, mounting bolts of CTs and PT shall have the provisions

for sealing arrangement so that removal of CTs & PTs from the installed positions in the

panel (for tampering/replacement) by the unauthorized person is not possible without

breaking/tampering the sealing arrangement. The hinge arrangement, sealing of CTs and

sealing of PTs shall be diagonally arranged in the base of each CTs & PTs. This sealing

arrangement shall be checked by the officers at the time of checking of sample and during

4)

inspection.

The epoxy casting of 11 kV CTs & PTs coils is required to be carried out under vacuum to

avoid any blow holes in the casted material. To establish this Epoxy hardener and

accelerator, if any is mixed in the mixing chamber under vacuum and poured into the dyes

placed in the casting chamber which is also kept under vacuum as per relevant IS

specifications. The temperature as specified by the Epoxy manufacturer is maintained with

thermostatic control so that all the moisture is also drained out under vacuum.

Electrical components:-

i) 11 kV metering current transformers (three Nos.)

The metering CTs shall be suitable for 11 KV, 50Hz, effectively earthed neutral system. Each

CT shall be suitable for single phase. The CT shall be single core, single ratio, epoxy resin

cast, copper wound primary type, with rated burden 5VA and accuracy class 0.5 or better

and conforming to IS 2705 (part-I & II) amended upto date. The ratio of CTs shall be as per

schedule of requirement. The instrument security factor (ISF) shall be upto 5.

The secondary terminals of the CTs shall be robust design so as to provide effective and firm

ii)

termination. The secondary winding resistance of CTs shall be as low as possible. Colour

coding viz. Red/Yellow/Blue for main and black for load side shall be used. Further, the load

side wires shall be provided with red/yellow /blue PVC tape rings at both ends for

identification. IS-1 and IS-2 shall be used for identification of main and load wires and

ferrules shall be used accordingly. No other symbols other than IS-1 and IS-2 shall be

accepted without prior approval. No link/test terminals/terminals shall be provided in wire

from CTs to meter terminals.

11 KV Potential transformers

The PT shall be indoor dry type epoxy resin cast, copper wound suitable for 1 phase, 11 KV

50 HZ, effectively earthed neutral system. There shall be 3 nos ,11KV single phase epoxy

resin cast PT per cubicles with rated burden 15 VA per phase and accuracy class 0.5 or

better and conforming to IS: 3156 (part-I&II) amended upto date. Colour coding viz

Red/yellow/blue shall be used for identification of phases and black for neutral. The PT shall

be type tested in accordance with IS:3156 (part-I&II) with latest amendments.

The PTs shall be of uniform insulating and withstand separate source 28 kV Pf. for one

minute as per clause 9.3.1.1 of IS:3156 (part-I).

i) CTs bus bar:- 40x6 mm copper strip

ii) PTs bus bar: Copper wire 8 SWG or flexible copper flat strip to connect PT or CT.

iii) Wiring for CTs/PTs secondary circuits:

There should not be any joint/termination between CT/PT secondary terminals to meter

terminals. Wiring of CTs and PTs should be done with 2.5 mm2 stranded copper insulated

conductor, CT wiring and PT wiring should run in independent flexible PVC pipes of

appropriate size from HT compartment to meter compartment. The Pipe shall be so laid that

no naked wire is visible. From pipes upto the meter in the meter chamber, all wiring should

be open and visible.

Short Circuit Rating of 11kv CTs

CT ratio Short time current rating

5/5 A 100 STF

10/5 A & 15/5 A 3KA for 0.5 seconds

20/5A to 30 A 7.88 kA for 0.5 seconds

50/5A and above 13.1 kA for 1.0 seconds

Samples

One numbers sample should be ready at the firms works after issue of LOA & before

issue of PO for new entrant. The sample shall be checked for its suitability and conformity

with this specification before placing the order. The drawing of sample must be attached with

tender showing all views of equipment installed inside the metering panel along with the

sketch of sealing arrangement as mentioned above. In case order is placed on the firm the

materials shall be supplied as per the approved sample and specification. However, approval

of the sample shall not absolve the supplier of his responsibility to supply the material as per

specifications.

Name plate:-

An Aluminium foil plate shall be affixed on front side of cubicle to indicate the following

information against which the desired information is required to be painted at site:-

i) NESCO property

ii) Supplier’s name

iii) PO No & date

iv) Sr No of panel

v) Panel CT ratio/accuracy class

vi) Panel PT ratio/accuracy class

vii) Meter CT ratio

viii) Meter PT ratio

ix) Consumer account No

x) Over all CT-PT multiplying factor

xi) Sanctioned load

xii) Date of release of connection

In addition to the above. one no. rating and diagram plate made of Aluminium shall be

provided on the front door of the HT compartment giving details viz: Sl no. of cubicle CT and

PT ratio burden, class of accuracy, year of manufacturing, total weight, P.O. No. and date

etc.

CALIBRATION.

All instruments used in inspection and testing should be properly calibrated and sealed from

any Govt. Test House/Reputed Agency certified by NABL and the reports shall not be less

than an one year old. Calibration certifications when demanded by inspecting officers shall

be provided/ produced for verification purpose.

TESTING FACILITIES:

The manufacturer should have all the testing facilities at their works to carry out all the

routine & acceptance tests including partial discharge test as mentioned below. List of plant

& Machinery and test Equipment available at manufacturer’s works should necessarily be

submitted along with tender.

ROUTINE AND ACCEPTANCE TESTS:

The following shall constitute the routine tests and acceptance tests.

CURRENT TRANSFORMERS:

a) Verification of terminal marking and polarity. b) High voltage power frequency test on Primary winding c) High voltage power frequency test on Secondary winding

d) Over voltage inter-turn test. e) Determination of errors according to the requirement of accuracy class (0.5) f) Partial discharge test in accordance with IS: 11322 / 1985.

POTENTIAL TRANSFORMERS:

a) Verification of terminal marking and polarity. b) Power frequency dry withstand test on Primary c) Power frequency withstand test on secondary d) Determination of errors according to the requirement of accuracy class (0.5) e) Partial discharge test measurement test in accordance with IS: 11322/ 1985.

Rating of CT will be given at the time purchase order.

B) Technical specification of 33 KV pilfers resistant metering cubicles for 3

phase, 4 wire metering system (with various CT ratios & PT of accuracy class-0.2).

1) General: The specification covers the design, manufacture, testing and supply of 33KV Indoor type

Metering cubicle made of MS plate.

1.1) The Metering cubicle shall be totally enclosed, air insulated dust and vermin proof having two

separate compartments H.T & LT provided with two separate doors, hinged inside the

box.The 33KV Metering cubicle shall comply with the requirements of Indian Electricity

Rules 1956 & as per relevant IS.

1.2) The Metering cubicle shall be supplied with three no. 33KV single phase epoxy resin cast

CT’s, three no. 33KV epoxy resin cast PT’s and suitable clamping arrangement for holding 33KV incoming and outgoing cables and holding CTs & PTs.

1.3) All the equipment shall comply with the requirement of relevant I.S specification.

2.0) Construction: The 33KV Metering cubicle shall be fabricated with MS sheet having thickness not less than

2.0mm.The overall dimensions of the cubicle shall be approximately 1800mm (Height) x

1400mm (Length) x 1500mm (Depth). These dimensions may vary slightly as per design of

the manufacturer taking into care the minimum clearance of 320 mm between phases as well

as between phase and earth.

2.1) All the edges and joints shall be made and welded in such a way that no access inside the

cubicle shall be possible and shall thus provide strength to robust mechanical structure both

during transportation and installation during it’s use.

2.2) The Metering cubicle shall be totally enclosed and shall be provided with two no. hinged door

made of MS sheet which shall rest on the collar along the four sides of cubicle so that the

doors remain flushed with body of the cubicle.

2.3) The hinge of the doors shall be concealed type (proper welded from inside) so as to

eliminate any chance of de-hinging without causing any damage to the cubicle.

2.4) The Metering cubicle shall rest upon two no. MS channels support of approximate size of

100mm x 50 mm x 5mm welded at bottom along it’s length (1400 mm).

2.4.1) Each of the supporting channel shall have two holes of 12 mm of dia suitable for foundation

bolts.

2.4.2) The Metering cubicle shall be provided with M.S. Earthing strip of size 50 mm x 5 mm welded

at the two opposite base angles provided with welded not of 6 mm dia welded from inside the

cubicle. The earthing strip can be connected by tightening a bolt from outside the metering

cubicle at two opposite ends.

2.5) The metering panel shall be cleaned suitably and will go through phospating using seven

tank dipping procedure and its surface shall be made smooth. It shall be powder coated as

per relevant IS specification.. The colour of paint shall be decided at the event of order.

Height of panel is fixed but width & depth is minimum and may be increased suitably to

accommodate CTs/PTs, if required. Height of panel is fixed but width & depth is minimum

and may be increased suitably to accommodate CTs/PTs, if required. Thus, total height

including base channel will be 1700 mm. The panel should be provided with 4 Nos. lifting

hooks.

2.6) The Metering cubicle shall have two separate compartments separated by MS sheet of 2.0

mm thickness as given below:-

2.6.1) UPPER (LT) COMPARTMENT:

The upper compartment of the metering cubicle shall be called LT compartment and shall

have approximate height of 550mm.

The compartment shall have provision for housing a trivector meter and check energy meter

(both not in scope of supply) along with its associated wiring. The upper compartment will be

double door type and the arrangement for meter fixing will be in inner portion.

2.6.1.1) For fixing of KWH trivector meter and check energy meter in this compartment, four nos. MS

slotted angles of suitable size shall be welded to the body from inside of partition chamber in

LT compartment, two nos. slotted angles shall be bolted vertically and two nos. horizontally

which shall be movable forming to adjust the distance and height of trivector meter and

check energy meter to be fixed in the compartment.

2.6.1.2) The upper compartment shall be provided with one door fabricated in one piece and hinged

as per clause No. 2.3 The door shall be provided with synthetic/semi synthetic gasket to

make it dust & vermin proof. The door shall be provided with a handle and two nos sealing

arrangement. There shall be one fixed (non-openable) window (approximate size 300 x

200mm) fitted with transparent acrylic glass. The glass shall be fitted / tightened with MS

Frame from inside of window. The height of window shall be such that the reading can be

taken easily from out side.

2.6.1.3) The LT compartment shall essentially contain the following:- Hanger of slotted angles for mounting main meter (L & T, SECURE, PAL MOHAN,GENUS

make etc) and check meter for having flexibility for mounting of meter vertically and

horizontally (meter not in scope of this supply).

2.6.2) LOWER (HT) COMPARTMENT:- The lower compartment of Metering cubicle shall be called HT compartment and shall have

approximate height of 1250 mm.

2.6.2.1) This compartment shall be housed three no. 33 KV single phase epoxy resin cast

CT‟s for “R, Y‟ and B‟ phases and three nos. 33 KV single phase epoxy

resin cast PT‟s, connecting strip between CT‟s and PT‟s, bus bar with suitable

clamping arrangement for incoming and outgoing 33 KV XLPE cables. There shall be two

nos sealing arrangement diagonally in base of each CT & PT.

2.6.2.2) The door of lower compartment shall be provided with one door fabricated in two pieces and

hinged as per clause No. 2.3 such that it becomes complete dust and vermin proof. The door

shall be provided with a handle and two Nos. sealing arrangement.

2.6.2.3) The compartment should be provided with two no. cable entries with detachable plate with

brass glands of appropriate size at the bottom suitable for 33 KV XLPE cable suitable for

appropriate current rating.

2.6.2.4) The HT compartment shall be essentially contain the following:-

a) 33 KV epoxy resin cast CT‟s (single phase) -03 no.

b) 33 KV /110/V epoxy resin cast PT‟s (single phase) -03 nos.

c) Flexible copper flat strip of 30 x 0.4 mm or 8 SWG copper -01 set

wire (duly insulated) to connect PT‟s to busbar of CT‟s

d) LT wiring for the secondary of CT & PT circuit, which -01 set

should not less than 2.5 mm² copper in size

An Aluminium foil plate shall be affixed on front side of cubicle to indicate the following

information against which the desired information is required to be painted at site:-NESCO

Name of consumer

Service connection no.

Sanctioned load

Date of release of connection

Type of load cont./Non cont.

Meter no & make

Line CTR / PTR

Meter CTR/PTR

Class of accuracy of CT

Class of accuracy of PT

CT/PT M.F

Dial factor: For Energy /For Demand

Overall M.F: for Energy/For Demand

Date of last checking

In addition to the above. one no. rating and diagram plate made of Aluminium shall be

provided on the front door of the HT compartment giving details viz: Sl no. of cubicle CT and

PT ratio burden, class of accuracy, year of manufacturing, total weight, P.O. No. and date

etc.

3.0) ELECTRICAL COMPONENTS:-

A brief detail of the various components to be provided in the metering cubicle is given below:-

3.1) CURRENT TRANSFORMER:-

There shall be 03 nos. single core single ratio dry type epoxy resin cast, current transformers

conforming to IS: 2705/1992 of latest revision thereof as per details mentioned below:-

Sl.No Particulars 33 KV CT,PT unit

1. Nominal system voltage (KV RMS) 33

2 Highest system voltage (KV RMS) 36

3 Frequency 50 Hz

4 No. of CT 3

5 Rated out put (V.A. burden) 5VA for CT Ratio: 5/5 Amps to 30/5 Amps & 10 VA for 50/5 Amps and above

6 Rated continuous thermal current 1.2 times of rated primary current

7 Short time current rating for 1 sec. For 5/5 A, 10/5 A & 15/5 A: 3KA for 0.5 seconds For 20/5A to 30 A: 7.88 kA for 0.5 seconds For 50/5A and above: 13.1 kA for 1.0 seconds

8 Rated dynamic current (Peak) 2.5 times of short time thermal current rating.

9 Instrument security factor Less than 5 (five)

10 Impulse withstand voltage (KV peak) (on assembled CT PT. set)

170

11 Maximum temperature raise over maximum ambient temperature of 45 C at rated continuous thermal current at rated frequency and with rated burden.

As per IS 2705/1992 (part-II)

12 Maximum ratio error do

Maximum phase angle error do

a Type Dry type epoxy resin cast

b Transformation ratio/ CT ratio (schedule of requirement to be supplied with LOI/P.O

As per Price Schedule

c No. of cores 0ne

d Rated continuous thermal current temperature rise over ambient

As per IS: 2705/192

e One minute power frequency voltage withstand test on secondary winding

3 KV

f class of accuracy 0.2

g Secondary termination S1 & S 2 shall be clearly engraved

h Primary termination P1 & P2 shall be clearly engraved

4.0 POTENTIAL TRANSFORMERS DETAILS SPECIFICATION AS PER IS 3156/1992 WITH LATEST AMENDMENTS:

Sl.No Particulars 33 KV ,PT unit

1. No. of PT 3 nos.

2 Nominal system voltage (KV RMS) 33

3 Highest system voltage (KV RMS) 36

4 No of phases 3

5 Frequency 50 c/s

6 Transformation ratio (PT ratio) 33 KV/110 V/√3 V

7 Rated out put (V.A. burden) 50 VA per phase

8 Impulse withstand voltage (KV peak) (on assembled CT PT. set)

150

9 One minute power frequency dry withstand voltage (on assembled CT.PT set Primary (KV RMS) Secondary (KV RMS)

70 3

10 class of accuracy 0.2

11 Rated voltage factor and time 1.2 times continuous and 1.5 times for 30 sec.

12 System condition Effectively earthed system

13 Maximum temperature raise over maximum ambient temperature (which may be taken as 45 C) at rated frequency and with rated burden.

Within limit of IS 3156 with latest amendment /revision.

14 Maximum ratio error Do

15 Maximum phase angle error Do

5.0) ROUTINE AND ACCEPTANCE TESTS:

The following shall constitute the routine tests and acceptance tests. 5.1) CURRENT TRANSFORMERS:

a) Verification of terminal marking and polarity. b) High voltage power frequency test on Primary winding c) High voltage power frequency test on Secondary winding d) Over voltage inter-turn test. e) Determination of errors according to the requirement of accuracy class (0.5) f) Partial discharge test in accordance with IS: 11322 / 1985.

5.2) POTENTIAL TRANSFORMERS:

a) Verification of terminal marking and polarity. b) Power frequency dry withstand test on Primary c) Power frequency withstand test on secondary d) Determination of errors according to the requirement of accuracy class (0.5) e) Partial discharge test measurement test in accordance with IS: 11322/ 1985.

5.3 CALIBRATION.

All instruments used in inspection and testing should be properly calibrated and sealed from

any Govt. Test House/Reputed Agency certified by NABL and the reports shall not be less

than an one year old. Calibration certifications when demanded by inspecting officers shall

be provided/ produced for verification purpose.

5.4 TESTING FACILITIES:

The manufacturer should have all the testing facilities at their works to carry out all the

routine & acceptance tests including partial discharge test as mentioned below. List of plant

& Machinery and test Equipment available at manufacturer’s works should necessarily be

submitted along with tender.

Guaranteed Technical Particulars

SCHEDULE OF GUARTANTEED TECHNICAL PARTICULARS OF 11 KV/33 KV

PILFER RESISTANT METERING CUBICLE

TABLE-A

SL.

NO.

DESCRIPTIONS Bidders particulars

11 KV 33 KV

1 Make of Cubicle

2 Thickness of M.S Plate used for fabrication of cubicle (mm)

3 Overall dimensions of cubicle (mm) a) Height (Approx.)

b) Depth (Approx)

c) Length (Approx.)

4 Is the cubicle dust & vermin proof ?

5 Details of arrangement for earthing of cubicle

6 Size of Window (mm) a) Width

b) Height

7 Size of Wire mess provided on window (mm)

8 Make and other details of insulator used for bus bar support of yellow phase.

9 a) Size of connecting strip used between H.V cables and CT.

b) Material used for connecting strip.

10 Minimum clearance:- a) Between H.V. Live part & earth (mm)

b) Between phases (mm).

11 a) Dimension of flexible link between bus bar & PT on H.T side.

b) Material used for flexible link.

12 Size of LT wire used for secondary wiring.

13 Hardware (Make)

14 State Yes / No for the availability of sealing arrangement. a) Cubicle seal & pad lock of LT compartment.

b) Cubicle seal & pad lock of H.T compartment.

c) Meter reading window

d) CMRI Port.


GUARTANTEED TECHNICAL PARTICULARS OF 33&11 KV PT SUITABLE FOR

11KV/33 KV PILFER RESISTANT METERING CUBICLE

TABLE-B

SL.

NO.


11 KV 33 KV

1 Name of Manufacturer

2 Manufacturers Type Designation

3 Name of resin employed in manufacture of P.T

4 Rated primary Voltage

5 Rated Secondary Voltage

6 Rated Burden of Secondary

7 Class of Accuracy

8 Temperature rise at 1.2 times rated voltage with rated Burden

9 Temperature rise for (8 above)

10 Rated voltage factor and time

11 1 Minute power frequency withstand test (dry voltage)

12 1/50 micro second impulse wave withstand test voltage

13 1 Minute power frequency withstand voltage on secondary

14 Total Weight ( 1 phase)

15 Mounting details

16 Overall Dimensions a) Length

b) Width

c) Height

17 The PT of the offered Design and cable termination kit should have been type tested during last five years from

the date of opening of the tender. It should also be

indicated that when and where were they type tested?

18 Details of test reports (to be enclosed with the tender bid Part-I)


GUARTANTEED TECHNICAL PARTICULARS OF 11 KV CT/33 KV CT SUITABLE

FOR 11KV/33 KV PILFER RESISTANT METERING CUBICLE

TABLE-C

SL.

NO.


11 KV 33 KV

1 Ratio

2 Name of Manufacturer

3 Manufacturers Type

4 Name of resin employed in manufacture of C.T

5 Rated Voltage

6 Rated primary current

7 Rated Secondary current

8 Rated Secondary output

9 Class of Accuracy

10 Instrument Security Factory

11 Short Time Rating ( 1 Second)

12 Rated continuous Thermal current (also indicate Temp. rise over ambient Temp.

13 Rated current Dynamic (peak value)

14 Power frequency (dry withstand test voltage on primary winding) one second

15 Power frequency withstand voltage on secondaries.

16 1.50 micro seconds impulse withstand test voltage

17 Power frequency (dry withstand test voltage on primary winding)

18 Total Weight(1 phase)

19 Overall Dimensions a) Length

b) Width

c) Height

20 The CT of the offered Design should have type tested during last five years from the date of opening of

tender and it should be indicated that whom and

where they type tested

21 Details of test reports (to be enclosed with the tender with Part-I)


SCHEDULE OF BIDS FOR TECHNICAL


1. Name of tenderer with Office and factory address: Tel.No./Telex No./Fax No.

2. Specification No.

3. Address of Local Office and Tel.No./Telex/Fax No. :

4. Tenderer’s Reference No. :

5. Last date and time of submission of Tender :

6. Date and time for opening of Tender :

7. Testing Facilities available :

8. Category of organization :

9. Whether qualifying certificates submitted :

10. Particulars of Earnest Money submitted :

11. Whether NESCO delivery clause accepted :

12. Whether agreed to :

a) Inspection Clause :

b) Packing Clause :

c) Retesting Clause :

13. Whether the material/equipment offered conformed to the

relevant ISS specification and drawing. :

14. Whether executed orders previously for the items tendered

now. Please give full details of supplies made.

15. Whether the product bears ISI mark :

16. Offer valid up to :

17. Delivery Schedule :

a)Commence with minimum quantity

b) Rate of delivery per month/quarter :

And completion time

18. If any deviation, please mention in deviation:

Sheet enclosed.

19. Technical literature/catalogue of the :

Materials offered enclosed.

20. Manufacturer’s supply experience

including user’s certificate furnished or not. :

21. Type test certificate from any NABL ACCRIDETED Testing

Laboratory, Govt. of India :

23. Whether Guaranteed Technical Data Sheet

Particulars submitted. :

Signature of Bidder

With Name and Seal of company

(This form is to be duly filled up and duly signed by the Bidder & submitted along with the tender.)

COST DATA (Metering Unit 11KV / 33 KV )

Sr.

No.

PARTICULARS

UNIT

UNIT

RATES

(RS.)

QTY.

AMT

(Rs)

1.

CORE (M4 or better)

KG

2.

ALLUMINIUM / COPPER

KG

3

INSULATION PAPER

Meter

4.

OIL

LTRS

5.

TANK

Kg

6.

CHANNELS/STEELS(EXCEPT

TANK)

KG

7

INSULATORS / BUHIUNGS

NO

8

OTHERS

LUMP

SUM

TOTAL

WASTAGE @%

Signature of Bidder with Seal

mailto:@%25

COST DATA

(Metering Cubicle 11KV / 33 KV)

Sl.

No.

PARTICULARS

UNIT

UNIT RATES (RS.)

QTY.

AMT

(Rs)

1.

CORE

KG

2.

COPPER WITH DPC

KG

3

INSULATION PAPER

Meter

4.

OIL

LTRS

5.

TANK

Kg

6.

CHANNELS

KG

7

INSULATORS / BUHIUNGS

NO

8

No

9

OTHERS

LUMP SUM

TOTAL

WASTAGE @%

Signature of Bidder with Seal

mailto:@%25

(i) 11KV & 33 KV METERING UNIT

Documents

Transcript of (i) 11KV & 33 KV METERING UNIT