CT Selection for Restricted Earth Fault protection
CT Selection for Restricted Earth Fault protection
(OP)
The 6.6kV Star side of an 7.5MVA transformer is earthed through current limiting resistor to 300mA. The CT on the earthed side are 1250/1A. The phase CT on the Transformer are 800/1A. Will the mismatch on the CT ( 1250 and 800) be a problem? If not a problem how are these CT connected including the relay to show zero amps. If yes there is a problem, how can I solve it






RE: CT Selection for Restricted Earth Fault protection
It is not an issue if you are using a low impedence protection for REF.
RE: CT Selection for Restricted Earth Fault protection