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Dear all,
Can anybody tell me that how to choose CT for a specific
load? I have a 200kw induction motor, which ratio CT should
be installed? Is there a formula or calculation that
determines the CT ratio for a load?
Regards.
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Answer Posted / k.prakashchandra
Another method.Divide KW by 0.75 (lowest pf expected) to get
KVA. Calculate current which is about 380 A at 400 V line
voltage.You can choose a CT 0f either 400 or 500 A as
primary current.The secondary current of CT is decided by
meter and relays.This is generally either 1 or 5 A .
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