摘要
用于GIS的隔离开关密封在壳体内部,无法直接观察触头位置,只能借助分合闸指示、电压电流信号辅助判断分、合闸位置。若由于传动机构卡涩等原因导致隔离开关分、合闸不到位,此时分合闸指示、电压电流信号无法反映动静触头的真实接触情况,极有可能进一步引发跳闸事故。针对一起隔离开关合闸不到位引起的GIS放电故障,通过现场试验测试与解体分析,判断故障原因为隔离开关机构严重锈蚀导致合闸后动静触头虚接、烧熔、滴落,最终发展为屏蔽罩对壳体放电。进一步对合闸不到位时触头触指接触电阻大小及发热程度进行理论分析和仿真计算,验证了故障原因分析的正确性。最后针对此类故障提出了相应的防范措施,为今后此类故障的处理提供参考。
The disconnector of GIS is sealed in the shell,so it can′t directly observe the contact position.It can only judge the opening and closing position with the help of opening and closing indication and voltage and current signal.If the opening and closing of the disconnector is not in place due to the jam of the transmission mechanism and other reasons,the opening and closing indication and voltage and current signals can not reflect the real contact condition of the dynamic and static contacts,so it is very likely to cause further tripping accidents.A GIS discharge fault caused by the disconnector closing not in place was analyzed.Through field test and disassembly analysis,it was judged that the fault was caused by the serious corrosion of the disconnector mechanism,which led to the virtual connection,melting and dripping of the moving and static contacts after closing,and finally developed into the shielding cover to discharge the shell.Furthermore,the theoretical analysis and simulation calculation of the contact resistance and heating degree of the contact finger when the switch is not in place were carried out to verify the correctness of the fault cause analysis.Finally,the corresponding preventive measures were put forward,which provide references for the treatment of similar faults in the future.
作者
张丕沛
李杰
汪鹏
ZHANG Pipei;LI Jie;WANG Peng(State Grid Shandong Electric Power Research Institute,Jinan 250003,China)
出处
《山东电力技术》
2021年第11期54-58,共5页
Shandong Electric Power
基金
国网山东省电力公司科技项目“GIS设备用固体绝缘件状态综合评价技术研究”(520626210012)。
关键词
隔离开关
虚接
放电故障
接触电阻
disconnector
virtual connection
discharge fault
contact resistance
