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2.4 The circuit breakers shall be complete with following requirements. :
1) Number of Poles 3
2) Basic Insulation level
a) 1.2 50 Microsecond impulse : 350
withstand voltage (KVP).
b) On Minute Power Frequency : 140
withstand volt g(KV rms).
3) Rated normal current : 2000 Amps.
4) Rated symmetrical breaking : 3000 MVA
capacity at highest system voltage.
5) Rated short circuit breaking capacity : 31.5 KA (rms.)
6) Rated duration of short circuit : 3 second.
7) Total break time for any current : 3 cycles
upto the rated breaking current.
8) Closing time. : Not more than 10
cycles.
9) Rated characteristics for short line faults As per Clause 4 of IS 13118 TEC-
56.
10) Rated transient recovery voltage for terminal faults: As per Clause-4. 102 of
IS: 13118 IEC56.
11) Rated line charging current breaking current :10 Amps.
12) Rated short circuit making current. : 50 KAp
13) Rated operating duty 0-0.3 Sec-Co-3 Min.- Co.
14) Total creepage distance : 1810mm
15) SF6 gas density monitor to be provided.
16) Gas filling device to be supplied with breaker with first filling
of SF6 gas and gas leakage detector.
17) Rated voltage of trip coil, 110 v DC operating mechanism electro
Dynamic.
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