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  1. Mohamed Farghaly

    Sometime CT secondaries are connect

    I think high voltage at both CTs secondary and it may burn or saturation.
  2. Mohamed Farghaly

    Check relaying for feeder sensitive earth fault protection

    I refer to sensitive earth fault set at 10A primary for feeders and incomer CB using Core Balance CT
  3. Mohamed Farghaly

    Check relaying for feeder sensitive earth fault protection

    I rely on SEF relay for each feeder to trip feeder CB with time delay "for ex 0.2 sec", SEF relay for incomer CB to trip incomer CB with time delay "for ex 0.35 sec" & relay fed from the CT on neutral of transformer to trip upstream CB with time delay "for ex 0.5 sec".

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