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Same CT for phase and residuel meaurements

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BassamD

BassamD

Electrical
Joined
Oct 17, 2000
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I have 2 protective relays (one is an O/C and the other in only a resisdual Wattmetric protection used in case of Petersen Coil earthed system).I use the same CTs for the 3 phases O/C protection and the Summation method of these 3 CTs to supply the residual input of the other relay. Is there a special approach to dimension the CTs and especially to Know the maximum burden.
Thanks in advance for your information.
BassamD
 
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