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Reply To: Protection riddle no.8 – Risk of operation in power plant

#1215
S.Muthukrishnan

    It is NOT pilot wire protection.It is same as residual e/f protection .Instead of adding three phase current from individual current transformers the three currents magnetic fluxes are added in a single core called corebalance c.t by inserting all three phase wires into the single core.The secondary turns which are wound on the core will develop voltage only when there is unbalance current in such a fashion when all the three are added is not resulting zero flux in the core.(Nothing but zero sequence current reflection). Regards S.Muthukrishnan