10 kV母线电压互感器熔断器熔断故障探讨  

Discussion on Fusing Fault of 10kV Bus Voltage Transformer Fuse

作　　者：吴小科 周江源 WU Xiaoke;ZHOU Jiangyuan(Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangzhou 343009,China)

机构地区：[1]广东电网有限责任公司广州供电局,广东广州343009

出　　处：《电工技术》2020年第17期95-97,共3页Electric Engineering

摘　　要：广州电网的10kV中压配电网基本采用中性点经过小电阻接地的接线方式。该接线方式相比于中性点不接地的接线方式,虽然更有效地降低了单相接地时的非故障相过电压倍数,限制了弧光接地过电压的发生,但是在实际运行中仍发生了由于10kV馈线跳闸而引起的10kV母线电压互感器熔断器熔断的事故。为此结合ATP-EMTP仿真进行了简单分析,查找到了原因,并提出了应对措施,可为今后变电站的运行提供借鉴。The 10 kV medium-voltage distribution network of Guangzhou Power Grid basically adopts a neutral point grounding wiring method with a small resistance grounding.Compared with the non-neutral point ungrounded system,this method is more effective in reducing the overvoltage multiple of the non-fault phase when single-phase grounding happened and limiting the occurrence of arc-grounded overvoltage.However,in actual operation,the accident of the 10 kV bus voltage transformer fuse blowing due to the 10 kV feeder tripping still occurred.Therefore,the reason was found by a simple analysis combined with ATP-EMTP simulation and countermeasures were proposed,which could provide a reference for the operation of the substation in the future.

关 键 词：电压互感器熔断器 熔断 中性点经小电阻接地 ATP-EMTP 

分 类 号：TM744[电气工程—电力系统及自动化]