500kV变电站外接35kV电源进线缺相故障分析

Analysis on Phase Failures of 35kV External Power Line for 500kV Substation

为保障500kV变电站站用电系统可靠运行,规程要求外接一条35kV电源进线备用。以一起外接电源进线B相跌落式熔断器熔断缺相故障为例,分析了站用变空载及负载时不同缺相情况的特征,总结出了简单实用的故障判据表,给出了熔断器熔断后的处理方法,为运行维护人员处理站用变缺相故障提供了依据。

In order to ensure the reliable operation of the auxiliary power system of 500kV substation,a 35kV external power supply line must be connected.In this paper,with the phase failure of B phase drop-out fuse of external power supply line as an example,the characteristics of different phase failures of the station transformer with no-load and load running are analyzed.The simple and practical fault criterion tables are summarized.The processing methods for fusing of fuses are suggested,providing the basis for the operation and maintenance personnel to deal with the phase failures of station transformer.