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CT Earthing

CT Earthing

CT Earthing

What is the best location for Earthing CT neutral? Protection panel or close to the CT itself?

RE: CT Earthing

Our standard is the first point where the CT circuit hits a set of terminal blocks in the control enclosure. Obviously a stand alone breaker is treated somewhat differently.

RE: CT Earthing

It should be as near as possible to CTs. A method described by Davidbeach is the perfectly practical and acceptable.

RE: CT Earthing

Not as near as possible to the CTs, that would be at the breaker. At the breaker could be thousands of feet away from the 10's of feet between the control house ground and the relays. The relays and other control house equipment are much more susceptible to induced overvoltages than the CTs themselves. Close to the relays, but at a consistant location; first termination in the control house meets that definition. As near as possible to the CT doesn't.

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