交流滤波器高压C_(1)电容器组层间鸟害时电容器过电压与过电流分析  

Overvoltage and Overcurrent Analysis of Capacitor of High-voltage C1 Capacitor Bank Layer of AC Filter as Bird Damage

作　　者：周春红 季一鸣 朱明轩 唐民杰 张颢瑾 汪佳玲 ZHOU Chunhong;JI Yiming;ZHU Mingxuan;TANG Minjie;ZHANG Haojin;WANG Jialing(Guilin Power Capacitor Co.,Ltd.,Guangxi Guilin 541004,China;State Grid Technical and Economic Research Institute Co.,Ltd.,Beijing 102200,China)

机构地区：[1]桂林电力电容器有限责任公司,广西桂林541004 [2]国网技术经济研究院有限公司,北京102200

出　　处：《电力电容器与无功补偿》2025年第1期7-15,共9页Power Capacitor & Reactive Power Compensation

摘　　要：直流输电工程交流滤波器是换流站的主要设备之一。目前,交流滤波器高压C1电容器接头间、电容器塔层间等部位鸟害导致不平衡电流保护跳闸的事故偶有发生。因没有每台电容器的过电压、过电流监测值,电容器性能受危害程度引起关注。所以,本文以某换流站的交流滤波器出现鸟害导致电容器H型不平衡电流保护跳闸为例,建立鸟害闪络导致层间接入短路阻抗R的等效电路,运用仿真软件分析了交流滤波器高压C1电容器组不同层间鸟害故障时及短路阻抗R不同值时交流滤波器阻抗变化、不平衡电流变化情况以及电容器的过电压与过电流参数变化情况,以助于分析评估电容器性能受危害程度。结论表明:同层间发生鸟害闪络时,高压C1电容器单元过电压、过电流随短路阻抗R减小而增大。离接电流互感器T2最远或最近的那一层台架,与相邻层间发生鸟害时,C1电容器单元的过电压、过电流最大。当短路阻抗R小于一定值时,高压C1电容器承受过电压超过允许限值,可见频繁鸟害对电容器性能有一定的危害。AC filter of DC transmission project is one of the main equipment of converter station.At present,such accidents as unbalanced current protection tripping due to bird damage between AC filter high-voltage C1 capacitor joints and between capacitor tower layers occasionally occur.Since there is no monitoring value of overvoltage and overcurrent of each capacitor,the harm extent of capacitor performance is concerned.In this paper,the type H unbalanced current protection tripping of capacitor of AC filter of one converter station due to bird damage is taken as an example.The equivalent circuit of short-circuit impedance R between layers due to bird damage flashover is set up,and the simulation software is used to analyze the variation of impedance of AC filter,variation of unbalanced current and variation of over voltage as well s over current parameters of capacitor in case of bird damage between different layers of high voltage C1 capacitor bank of AC filter and different short circuit impedance R,so as to assess the extent of the damage of the performance of capacitor.The conclusion shows that in case of flashover in the same layer due to bird damage,the overvoltage and overcurrent of high voltage C1 capacitor unit are increased with the decrease of short circuit impedance R.In case of bird damage between the bracket which is furthest or nearest to the current transformer T2 and the adjacent layer,the over voltage and over current of C1 capacitor unit is the highest.When the short-circuit impedance R is less than a certain value,the high-voltage C1 capacitor can withstand the overvoltage exceeding the allowable limit,which shows that frequent bird damage has a certain harm to the performance of the capacitor.

关 键 词：交流滤波器 高压C1电容器组 鸟害闪络 短路阻抗 不平衡电流 过电压 过电流 

分 类 号：TM53[电气工程—电器] TM721.1[电子电信—电路与系统] TN713