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SPEC. NO. 908 : 01-2014 PAGE 1
(908DT.doc-1) (01/14)
SPECIFICATION NO. 908 (01-2014)
FAULTED CIRCUIT INDICATORS
908A Scope
This specification describes the requirement with which the manufacturer shall
comply in order to supply faulted circuit indicators (FCI) for MEA's 12 or 24 kV
overhead distribution system.
908B Site and Service condition
The FCI shall be installed in the Bangkok Metropolis, Thailand. The service
conditions are as follows : -
a) Altitude : approximately mean sea level.
b) Maximum ambient temperature : 40°C.
c) Average temperature in any one year : 30°C.
d) Average relative humidity in any one year : 79%.
e) Average maximum relative humidity in any one year : 94%.
f) Grounding system : uni-grounded WYE at distribution substation.
g) Maximum available fault current:16 kA (sym) for 12 kV : 8 kA (sym) for 24 kV
The faulted circuit indicators shall be suitable for use in tropical climatic area and
shall be capable of operating successfully in the service conditions mentioned
above.
908C Reference Standards
Except otherwise specified elsewhere in the specification, FCI required by MEA
shall be manufactured and tested in conformity with the latest revision of
ANSI/IEEE Standard 495-1986 : IEEE Guide for Testing Faulted Circuit Indicators
or relevant IEC standard.
If there are any minor parts deviated from the standards, they shall be clearly
mentioned in the "DEVIATION FROM MEA'S SPECIFICATION FORM"
attached herewith.
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908D Test and Test Report
908D1 The proposed FCI shall have successfully passed all the type tests or
design tests in accordance with the applicable standards. The test reports
of the proposed FCI are required. Test reports of identical units are
acceptable.
In case FCI is tested according to IEC standard at least, the following type
test items and documents shall be included.
− Temperature cycling test.
− Ingress protection test (IEC 60529 not less than class IP 65).
− Impact resistance or vibration test.
− Trip current and reset time test.
− Outdoor weathering of plastic test or UV withstand certificate
from plastic raw material manufacturer.
All test reports shall be attached to the bid or be submitted to MEA within
15 (fifteen) days after opening date. If the type test reports are not
delivered to MEA within 15 (fifteen) days after the opening date, MEA
will not consider such offer.
908D2 Prior to the shipment, the supplier shall submit to MEA the complete and
certified reports of all tests made in 6 (six) copies. The test reports shall
contain all data required for their complete understanding such as ;
diagrams, methods, instruments, constants and values used in the tests
and the results obtained. If MEA has his own inspector, the supplier shall
submit all the above test reports to the inspector and the inspector himself
shall certify the witnessed test report and review the remainder before
submitting to MEA.
908E Drawings and Instructions
One complete set of drawings, installation and operating instruction shall be firmly
attached to or boxed with each set of FCI.
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908F General Requirements
908F1 The FCI shall automatically provide an indication that the fault current
has passed through the conductor where the FCI sensor is installed. The
operation of the FCI shall be electronic type.
908F2 The FCI shall be designed to be firmly attached to the overhead XLPE
covered conductor having overall diameter ranging from 20 to 31.08 mm.
(35 mm2 to 185 mm2). The FCI shall withstand any conductor swing due
to storm or line fault without dropping.
908F3 The FCI shall automatically reset after expiration of its reset time.
908F4 The fault indication of FCI shall be by means of flashing LED which is
visible even in the bright day light.
908F5 The FCI shall be designed to work with upstream reclosing circuit breaker
or recloser having operating sequence as follows:-
O-3sec-CO-1min-CO-Lockout
The FCI shall indicate temporary fault after circuit breaker reenergizes
within above sequence. The FCI shall indicate permanent fault after
circuit breaker lockouts.
908F6 The FCI shall have an inrush restraint feature which prevent the FCI to
indicate the high inrush current. Functions of the proposed inrush restraint
feature shall be explained.
The FCI shall be designed to avoid any false operation or proximity
tripping from adjacent conductors.
- Conductor spacing between phases of the same circuit is 24 cm.
- Conductor spacing between circuits is 90 cm.
Bidder is requested to state the minimum conductor spacing which the
FCI will operate properly with supporting test or explanation why the FCI
will not malfunction in case of fault in adjacent phase.
908F7 The FCI shall be designed for hot line installation and disconnection by a
grip-all clampstick.
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908F8 Adapter for installation and disconnection of FCI by a clamp stick (if
necessary) shall also be supplied free of charge for 36 sets.
908F9 Any reset and test equipment shall be supplied free of charge for 18 sets
908F10 Power supply for flashing shall be taken from an exchangeable battery or
any other means having a shelf life expectancy of not less than 10 years at
40°C.
908F11 The FCI unit shall be waterproof and shall be designed to operate
properly in direct sunlight.
908F12 All metal parts shall be non-corrosive material.
908F13 The nameplate showing year of production, manufacturer trademark,
contract number shall be permanently shown on the unit.
908F14 Type, size and rating of batteries including ordering information shall be
provided by bidders.
908F15 One sample of FCI, adapter for installation and adapter for reset shall be
submitted with the bid or with in 15(fifteen) day after bid opening date.
908G Rating
Fault detection method and setting
: Current threshold setting range from
200(250) - 600 A
Other method of fault detection such as adaptive load setting etc. is also accepted.
Details of fault detection principle and setting shall be explained. (see note)
Phase : single
Reset time : ≥ 3 hours
Flashing frequency : ≥ 20 times/minute
Battery shelf life : ≥10 years at 40°C
Total flash time : ≥ 800 hours
Fault current rating : 25 kA 10 cycles
Maximum operating temperature : 70°C
IP : 65
Note Current setting shall not change or alter the IP of the FCI.
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908H Additional Requirement for Packing
If any parts are packed in the cartons for containerized shipment, the cartons shall
be arranged into pallets so as to facilitate their movement by forklift trucks.
908I Additional Requirement for Responsibility
If any fault circuit indicator is damaged within the guaranteed period, the
manufacturer shall promptly investigate, repair or replace it. The replacement shall
reach MEA within 60 days after being first informed otherwise the performance
security shall be forfeited.
MP7-8944-BBX