一起变电站直流系统异极环网故障分析与处理

Analysis and Treatment of a Case of Heteropolarity Fault of Loop Network in DC System Encountered by an Actual Substation

结合现场工作实践,分析了某500 kV变电站一起隐蔽的直流异极环网事件,描述了故障排查过程,推导了直流系统异极环网时的基本现象,并对故障未及时发现的原因进行了推断,最终提出了具体的整改措施建议,对于一些隐蔽的直流环网事件处理和预防具有一定的借鉴作用。

This paper reports a case of covert fault of DC loop network heteropolarity encountered by an actual 500 kV substation.It describes the process of fault type search,the deduction of basic phenomena related to DC loop network heteropolarity,and causal analysis and countermeasures proposal against failure in timely observation of the fault.The paper may have useful information for handling and preventing covert accidents in covert DC loop networks.