Answer / william lobo

Resin Cast CT and PTs are usually used in indoor
switchgeear 11kv or 6.6kv substations etc. whereas Oil
cooled CTs are used in outdoor substations viz 11kv or 33kv
switchyards.
Difference is that Resin cast are solid cast type. Oil
cooled are those immeresed in Transformer oil and sealed.

In larger capacity CTs where cooling is required then oil
cooled CTs are preferred.

sir, i want to know the calculation for find rated current for cable sizes.(both copper & aluminium) with examole. please sir for example: 35sq.mm al.cable is withstands for how many amps? is suitable for 45kw motor?

5 Answers   L&T,

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Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on External earth fault REF relay trips along with earth fault relay.The REF relay has no complant as we tested relay.Why is it happening?

3 Answers   KSEB,

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5 Answers   Juniper Networks,

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what is ballast

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