Study on the Sensitivity of Selective Leakage Protection of Different Ground of Grid

Abstract

In view of the current direct supply situation of our coal mines high voltage distribution networks commonly used 6kV or 10kV electric cables,on the base of describing mechanism of three different neutral point grounded of underground high voltage distribution networks,detailed analysising three different grounded way of high-voltage power grid parameter sensitivity of leakage protection. The results show that, mine the sensitivity of the high-voltage grid leakage protection and start zero-sequence voltage have a great relationship, the greater the zero-sequence voltage setting value, the device's ability to detect leakage faults weaker corresponding lower sensitivity.