10kV开关柜穿屏套管的局部放电检测与结构优化
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摘要
开关柜穿屏套管是局部放电的易发部位,目前通过带电检测技术可有效检测到开关柜的局部放电,然而目前常用的超声波法和暂态低电压法对于开关柜局放检测均存在一定的局限性。介绍了超声波法和特高频方法联合诊断开关柜穿屏套管烧蚀的典型案例,并利用有限元方法仿真计算了开关柜穿屏套管的电场分布,验证了带电检测的结论即穿屏套管金属板与母排未连接,造成局部场强过高,导致悬浮放电。本文还利用有限元计算方法,结合绝缘结构优化设计原理,对开关柜穿屏套管的绝缘结构进行了优化设计,优化后的开关柜穿屏套管绝缘结构电气性能显著增强,能有效避免安装和运行过程中造成的缺陷导致的局部放电。
Bushing of 10kV switchgear is prone to partial discharge. Though live detection can find out partial discharge,the mostly used ultrasonic(AE) and transient earth voltage(TEV) methods have some limitations. A typical case which detected bushing erosion based on ultrasonic(AE) and transient earth voltage(TEV) methods is introduced. Furthermore,the electric field distribution of bushing is simulated using finite element method(FEM),which confirms the live detection conclusion that the metal plate and the busbar were not connected and thus led to local electrical field distortion and floating potential discharge. At last,the structure of bushing of 10kV switchgear is optimized based on finite element method(FEM) and insulation structure optimization principles. The optimized bushing of 10kV switchgear has a significantly better electrical performance and can effectively avoid partial discharge caused by the defects produced during installation and operation.
Bushing of 10kV switchgear is prone to partial discharge. Though live detection can find out partial discharge,the mostly used ultrasonic(AE) and transient earth voltage(TEV) methods have some limitations. A typical case which detected bushing erosion based on ultrasonic(AE) and transient earth voltage(TEV) methods is introduced. Furthermore,the electric field distribution of bushing is simulated using finite element method(FEM),which confirms the live detection conclusion that the metal plate and the busbar were not connected and thus led to local electrical field distortion and floating potential discharge. At last,the structure of bushing of 10kV switchgear is optimized based on finite element method(FEM) and insulation structure optimization principles. The optimized bushing of 10kV switchgear has a significantly better electrical performance and can effectively avoid partial discharge caused by the defects produced during installation and operation.
引文
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[2]田勇,田景林. 6~10 k V开关柜事故统计分析与改进意见[J].东北电力技术,1996(8):5-10.TIAN Yong,TIAN Jinglin. The statistics and analysis of faults in 6~10 k V switchgears[J]. Northeast Electric Power Technology,1996(8):5-10.
[3]王流火,吕鸿,吴吉,等.开关柜局部放电检测技术的应用研究[J].高压电器,2014,50(3):62-67.WANG Liuhuo,LV Hong,WU Ji,et al. Application study on detection technology of switchgear partial discharge[J]. High voltage apparatus,2014,50(3):62-67.
[4]章涛,王俊波,李国伟. 10kV开关柜局部放电检测技术研究与运用[J].高压电器,2012,48(10):100-104.ZHANG Tao,WANG Junbo,LI Guowei. Research on the partial discharge detection technology for 10 k V switchgear[J]. High Voltage Apparatus, 2012, 48(10):100-104.
[5]王娟.基于UHF的高压开关柜局部放电在线监测研究[D].保定:华北电力大学,2007.
[6] LIYangqing,LU Fangcheng. Study on ultrasonic generation mechanism of partial discharge[C]//2005 Interntional Symposium on Electrical Insulating Materials. Kitayushu,Japan:IEEE,2005:467-471.
[7]严璋,朱德恒.高电压绝缘技术[M].北京:中国电力出版社,2007:192-201.
[8]倪光正,钱秀英.电磁场数值计算[M].北京:高等教育出版社,2000:123-147.
[9]刘国强. Ansoft工程电磁场有限元分析[M].北京:电子工业出版社,2005:192-201.
[10]齐玉.高压复合绝缘套管及电缆终端电场仿真及优化设计[D].北京:华北电力大学,2004.
[11] LINaiyi,YANG Xi,PENG Zongren. Measurement of electric fileds around a 1 000 k V UHV substation[J].IEEE Transactions on Power Delivery,2013,28(4):2356-2362.
[12]颜群.一种固体绝缘开关柜绝缘结构的设计与分析[J].机械研究与应用,2009(5):77-80.YANQun. Design and analysis of insulation structure of solid insulation swichgear[J]. Mechanical research and application,2009(5):77-80.
[13]高扬,周岩,刘婷婷,等.高压开关柜的三维电磁场数值仿真[J].信息与电子工程,2009(6):540-544.GAO Yang,ZHOU Yan,LIU Tingting,et al. 3-D numerical simulation of electromagnetic field in HV switchgear cabinet[J]. Information and Electronic Engineering,2009(6):540-544.