CT ratio

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?

Interview Candidate
Aug 18th, 2011
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Electrical Engineering

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Nishant Vadhavana

Sep 5th, 2011

What is the voltage level of Motor--415 v or 11KV or 6.6 KV
Based on that find its full load rating
Check the application of CT - metering or protection as it defines its saturation limit
Check what seconday input you required 5A or 1A at full input based on you can select like 400/5A cT (if LT suppply)
for 11KV