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choose current transformer

choose current transformer

choose current transformer

(OP)
hi
1-how choose transformer suitable for metering or protection?
2- what happend if VA off load greather than VA for transformer current? for example metering CT 10VA 500/5 and load 1.2 ohm
now max.load=10/25=0.4 ohm but load=1.2 what happend for ct
3- how caculated knee voltage Vk

RE: choose current transformer

I read the ABB paper from the Google search and it is very understandable.

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