换流站低压直流系统接地故障及应对措施

Analysis on Grounding Fault of Low Voltage DC System in Converter Station and Countermeasures

低压直流系统作为换流站的重要设备,它的稳定运行直接影响整个直流输电系统及交流系统的安全稳定运行。本文通过葛洲坝换流站的直流接地事故案例,分析查找了直流接地故障原因,总结了直流接地故障的查找方法和采取的应对措施。这些应对措施有效提高了直流输电系统的运行维护水平,还可为其他换流站的设计和运维提供参考意见。

As an important equipment of the converter station, the stable operation of low voltageDC system directly affects the safe and stable operation of the whole DC transmission system andAC system. An earth fault case of the low voltage DC system in Gezhouba converter station is intro？duced,the causes of the earth fault of the low voltage DC system are analyzed, the finding methodof DC earth fault and the countermeasures taken are summarized. These valuable experiences notonly help to improve the operation and maintenance level of HVDC transmission system, ensure thesafe and stable operation of the system, but also provide references for the design and operating ofconverter station in the future.