油纸电容式套管故障统计分析和模拟测试研究.docVIP

油纸电容式套管故障统计分析及模拟测试研究 国江,倪学锋,林浩,姜胜宝,黄林 （中国电力科学研究院，武汉 430074） 摘 要：油纸电容式套管广泛应用于电力系统变压器、电抗器、开关等重要电力设备中。近年来，变压器、电抗器、开关的套管事故和故障频繁发生，已经引起了有关部门的重视。文章介绍了近年来在国网电力系统运行的国产和进口变压器、电抗器的套管事故和故障情况，对国网电力系统出现的套管事故和故障案例进行了统计分析，同时通过理论计算及结构设计，提出了通过模拟套管测试研究以了解并掌握油纸电容式套管故障原因。 关键字：油纸电容式套管；事故和故障；统计分析；模拟套管测试 中图分类号：TM 文献标识码：A 文章编号：1001-1390（2014）00-0000-00 Research on the Statistical Analysis and Simulation Tests of the Oil-Impregnated Paper Capacitance Graded Bushing Faults GUO Jiang, NI Xue-feng, LIN Hao, JIANG Sheng-bao, HUANG Lin (China Electric Power Research Institute, Wuhan 430074, Hubei, China) Abstract: The oil-impregnated paper capacitance graded bushing is widely applied to the important electrical equipment in the power system such as transformers, reactors, switches and so on. In recent years, bushing accidents and faults of transformers, reactors and switches occur frequently, which has aroused great attention of the relevant departments. This paper introduced the bushing accidents and faults of the transformers and reactors operating in the State Grid power system, which had been made in China or imported from abroad. And then statistical analysis was made of the bushing accidents and faults in the State Grid power system. Meanwhile, through theoretical calculations and structural design, the paper put forward the proposal that the simulation bushing test should be made to learn and master the reasons for the oil-impregnated paper capacitance graded bushing faults. Key words: oil-impregnated paper capacitance graded bushing, accident and fault, statistical analysis, simulation bushing test 引 言 套管是变压器、电抗器、开关等电力设备的重要组件。它不仅起着将绕组引出线引出，实现与外部电网连接，还起着固定引线的作用。所以套管必须满足电气强度和机械强度的双重要求。其绝缘性能以及电流导通性能，对保证电力设备可靠供电和安全运行至关重要。据统计，国网电力系统110 kV及以上变压器10年（1990—1999年）的事故中，与套管相关的事故约占变压器总事故台次的6.3%，占总故障台次约11%[1-3]。需要特别引起注意的是，随着电压等级的提高，套管事故所占比例不断增加。据有关统计，自20世纪80年代国内500kV变压器投运至2002年底的不完全统计，先后发生因套管（及相关部位）引起的事故23台次，存在故障25台次，占同期总的变压器事故和故障台次的36%和12.4%[4]。 由此可见，套管对于电力系统安全稳定运行构成了比较大的威胁。根据已发生的事故案例，对历次事故和故