Answer / blake australia

To detect earth faults:
Zero sequence refers to the current flowing during an earth
fault. 2methods of decting earth fault.
-Measure the current on the earth return cable
-Measure the current imbalance on the 3x phase cables (do
this by putting all three through the same core balance CT.

Answer / prabhakar

For 51G protection we normally use the CBCT(Core balance
current transformer)for to detect the unbalance current
caused due to earth fault

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