特高压气体绝缘金属封闭式组合电器的现场冲击耐压试验方法  

Method of On-site Tests for the Withstand Voltage of Ultra-high-voltage GIS Lightning Impulse

作　　者：陶风波 王帅[2,3] 贾勇勇 文韬 刘轩东[2] 张乔根[2] TAO Fengbo;WANG Shuai;JIA Yongyong;WEN Tao;LIU Xuandong;ZHANG Qiaogen(Electric Power Research Institute, State Grid Jiangsu Electric Power Co.,Ltd., Nanjing 211103, China;State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China;Electric Power Research Institute, State Grid Liaoning Electric Power Co.,Ltd., Shenyang 110006, China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,南京211103 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [3]国网辽宁省电力有限公司电力科学研究院,沈阳110006

出　　处：《高电压技术》2018年第12期3936-3943,共8页High Voltage Engineering

摘　　要：气体绝缘金属封闭式组合电器(GIS)的现场冲击耐压试验能够更有效地检测出金属尖刺、绝缘子断裂等集中性缺陷,已成为设备现场耐压试验的重要组成部分。为此针对1000kV淮南—南京—上海交流特高压南京变电站1100kVGIS现场雷电冲击耐压试验工程,利用ATP-EMTP电磁暂态分析软件对特高压GIS现场冲击耐压试验系统进行建模,并研究了特高压GIS现场冲击耐压试验方式的选取与试验条件对电压波形的影响。研究结果表明:当负载电容Ct<7000pF时,能够通过调节波前电阻使负载电压满足标准雷电波要求,当负载电容Ct>7000pF时,无法得到标准雷电波;接入单台断路器的方式试验电压波形质量高,试验工作量大;接入多台断路器的方式试验效率高,但需降低对试验电压波形的要求。接入外置分压器会使电压幅值略微下降、波前时间增加;套管间高压引线长度增加会使波前时间略有缩短,并导致负载电压波形出现振荡,引线长度取20m较为合适。On-site tests for the withstand voltage of lightning impulse of gas-insulated metal-enclosed switchgear(GIS), which can effectively detect concentrative defects, has become an important part of GIS on-site withstand voltage tests. Therefore, we developed a model for the system of testing the withstand voltage of ultra-high-voltage GIS on-site lightning impulse by the ATP-EMTP transient analysis software based on the 1 100 kV GIS on-site withstand voltage test project of 1 000 kV Nanjing Ultra-high-voltage Substation. Moreover, we investigated the influences of test schemes selection method and the test conditions on the voltage waveform. The results show that the standard lightning impulse voltage waveform can be generated by regulating the wavefront resistance when the load capacitance is smaller than 7 000 pF; however, when the load capacitance is greater than 7 000 pF, the standard lightning impulse cannot be obtained. If the single-circuit-breaker connecting mode is adopted, we can get a higher waveform quality, but the efficiency is relatively lower. If the multi-circuit-breaker connecting mode is adopted, higher efficiency can be acquired at the expense of waveform quality. The introduction of external voltage divider will slightly decrease the voltage amplitude and make the wave-front time longer. As the length of high voltage wire between bushing increases, the wave-front time is slightly shortened, and simultaneously causes the oscillation of load voltage waveform. Thus, the 20 m-long wire is suggested to be adopted.

关 键 词：特高压气体绝缘金属封闭式组合电器 现场冲击耐压试验 负载接线方式 波前时间 过冲系数 试验条件 

分 类 号：TM595[电气工程—电器]