Research on the Zero-Sequence Impedance Testing of Transmission Line
The sudden drop in zero-sequence impedance of transmission lines will directly affect the reliability of line grounding distance protection and zero-sequence direction protection.In response to the problem of high zero-sequence impedance discovered during the testing process of line parameters,an analysis was conducted on the testing of zero-sequence impedance from the grounding method of overhead ground wire and the grounding resistance of the substation's grounding network.The line was investigated and the parameters were retested.Finally,the steps and testing suggestions for the zero-sequence impedance testing method of line parameters were provided.
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