T型网络对介损试验影响的仿真分析与建议  

Simulation Analysis and Suggestions on Influence of T-type Network on Dielectric Loss Testing

作　　者：李永昆 赵胜男 常莉敏 王笑宇 杨明 徐静 LI Yongkun;ZHAO Shengnan;CHANG Limin;WANG Xiaoyu;YANG Ming;XU Jing(State Grid Henan Extra High Voltage Company,Zhengzhou 450000,China)

机构地区：[1]国网河南省电力公司超高压公司,郑州450000

出　　处：《电力电容器与无功补偿》2024年第6期30-35,共6页Power Capacitor & Reactive Power Compensation

摘　　要：文中介绍一起500 kV断路器并联电容器现场交接试验负介损值的案例,经现场检查、原理分析,发现并联电容器下方木质支撑架构受潮,形成T型网络,造成被试品介损实测值为负值。为探究此T型网络各参数对被试品电容量和介损的影响规律,对T型网络进行等值电路分析,利用Matlab进行仿真分析,发现被试品电容量和介损的测量误差随着对地杂散电阻的增大而增大,随杂散电容的增大,介损值的影响误差先增大后减小,电容量的误差一直增大,杂散电阻的影响与杂散电容相反。针对现场试验环境,提出相应具体措施,为相关设备的现场试验提供经验借鉴。In this paper,a case of negative dielectric loss during onsite handover test of a parallel capacitor for 500 kVcircuit breaker is introduced.It is found through onsite inspection and principle analysis that the wood support structure beneath the parallel capacitor is damped and Ttype network is formed.,causing the measured dielectric loss to be negative.In order to explore the influence of each parameter of this Ttype network on the capacitance and dielectric loss of the tested object,an equivalent circuit analysis is performed on the Ttype network.Matlab is used for simulation analysis.It is found that the measurement error of the capacitance and dielectric loss of the tested object is increased with the increase of stray resistance to ground.With the increase of stray capacitance,the error of dielectric loss is increased firstly and then decreased.The error of capacitance is continued to increase,and the influence of stray resistance is opposite to that of stray capacitance.As for the test environment at site,the corresponding specific measures are proposed so to provide experience reference for the onsite testing of the relevant equipment.

关 键 词：负介损值 支撑架构 T型网络 仿真分析 误差 

分 类 号：TM561[电气工程—电器]