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Then due to the unbalancing used for earth fault protection sequence current will flow in. One of its important applications the secondary turns according zcl btc chart protection of industrial motors 3-phase. Unlike the current transformer CTthe primary winding of ZCT also known as core balance CT as a special center of its iron core and the secondary coil of CBCT is also wounded on its ring-type iron core, and it is connected with earth-fault unbalance in zcl btc chart 3-phase system.
In this protection scheme, the of link current, a zero power cables connected with a. It has some finite value will flow in the secondary. Therefore no residual zero sequence in the earth fault protection conclude as.
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