The protection based on zero sequence direction or negative sequence direction plays important roles in power system relay protection. But in the condition of a high resistance grounded system or PT disconnection, the voltage at some of measuring points is small which will affect the discrimination of directional element. In order to solve these problems, this paper brings forward a new criterion based on zero sequence current or negative sequence current to build zero sequence directional reference or nega...
This work is supported by National Natural Science Foundation of China(No.51607106)and Key Project of Scienceand Technology Research Program of Hubei Provincial Education Department(No.Z2017037).广域系统的纵联保护和后备保护均使用了负序方向保护或零序方向保
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