500/220kV同塔四回输电线路接地开关开合感应电压—感应电流能力研究  

Research on Switching Induced Voltage and Current by Earthing Switch in 500/220 kV Four-circuit on One Tower

作　　者：李兴旺[1] 卢启付[1] 汪晶毅[2] 王流火[1] 吕鸿[1] 廖民传[2] 

机构地区：[1]广东电网公司电力科学研究院,广州510080 [2]广东省电力设计研究院,广州510663

出　　处：《高压电器》2013年第9期63-68,共6页High Voltage Apparatus

摘　　要：同塔多回输电线路有效解决了电网建设与输电走廊紧缺之间的矛盾,但对接地开关提出了严苛的要求。笔者以500 kV祯宝甲乙线与220 kV东莆甲乙线同塔四回架设为例,对感应电压和感应电流进行了理论分析,采用电磁暂态仿真程序(ATP-EMTP)计算了两种不同运行工况下,停运线路的感应电压和感应电流。发现计算结果超过了标准规定的接地开关能够开合的B类感应电压、电流的要求。依据计算结果对500 kV东莞站采用的220 kV JW6-252/J50型接地开关进行了开合超B类感应电压、电流的试验。在开断电磁感应电压2.7 kV、电磁感应电流236.9 A过程中,接地开关拉弧现象较为明显。开合10次后发现,动主触头表面光洁无烧蚀痕迹。试验前后该型接地开关的分合闸时间保持一致,满足设计要求。试验结果表明,该型号接地开关能够有效开合计算要求的感应电压和感应电流。Multi-circuit on one tower for authors take the 500 kV Zhen-Bao double electric transmission lays high restrictions on the earthing switch. The lines and the 220 kV Dong-Pu double lines on one tower as an example to analyze the induced vohage and current, and calculate the induced voltage and current of the 220 kV Dong-Pu double lines with the software ATP-EMTP （Alternative Transients Program-Electromagnetic Transients Program）. The results show that the induced voltage and current exceed the values of B class of earthing switch. Further, they conduct a test of switching the Uhra-B class induced voltage and current on the 220 kV JW6-252/J50 earthing switch in 500 kV Dongguan Transformer Substation. Obvious arc phenomenon is observed in the earthing switch in breaking the induced voltage of 2.7 kV and the induced current of 236.9 A. After 10 times of breaking, the surface of the moving contact is still smooth without ablation. And the switching time of the earthing switch keeps consistency before and after the test, meeting the design requirement. Test results indicate that this type of earthing switch can effectively switch required induced voltage and current.

关 键 词：同塔四回输电 接地开关 感应电压 感应电流 

分 类 号：TM564[电气工程—电器]