Sep 01,  · The working principle of distance relay or impedance relay is very simple. There is one voltage element from potential transformer and a current element fed from current transformer of .

On the receiver board the bottom right relay is #1 then #2 & #3 going up. The top left relay is #4 then #5 & #6 going down. For the relay wire screw terminals the center screw is common for all relays. For the left bank of relays the bottom screw is NC & the top screw is NO. For the right bank of relays the bottom screw is NO and the top one is NC/5(13).

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