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CT Earthing 2

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Prot123

Electrical
Joined
Jul 25, 2018
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43
Location
AU
What is the best location for Earthing CT neutral? Protection panel or close to the CT itself?
Thanks
 
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.
 
It should be as near as possible to CTs. A method described by Davidbeach is the perfectly practical and acceptable.
 
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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