Answer / myo zaw

I think Main Incomer is like our house main switch like 60 Amp
and feeder is like our lighting switch or sub main breaker.
Because all the VCB structure of incomer and feeder is same but different is its current carrying capacity .Most of the incomer is for eg 33 kV , 1250 Amp and the feeder is 33 kV 630 Amp.

Answer / vijaykumar

there won't be any differenece b/w VCB's used in the
incomer or outgoing feeder provided the current ratings of
both are same.The protection and control wiring differs b/w
them as incomer needs only U/V,O/V,O/C,E/F protections but
the outgoing contains differnet protections depending upon
the load requirements.

Three set (each phase contain 2 cable of 400 mmsq CU XLPE AWA) of single core cables are connected to 11 KV motor of 14 MW & the switch gear supplay is taken from 11kv feeder & this supplay taken from 275 KV substation. Problem is one pair cable(L3- 2 cable ) getting very hot & gland melted and damaged in switch gear side. the other two cable haven't any more hot(ambient temp only & L3 haveing 95- 100 Degree C. The same problem happened in 275 KV substation switch gear side also where the supply taken for 11 kv switch gear. But here L2 phese cable had problem. Why it is happening like this?. The cable having temperature different at different location from gland side inthe case of 11KV feeder of 275 kv substation. why ?

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