谐波过电压下电缆护层保护器泄漏电流特征分析  

Leakage Current Characteristic Analysis of Cable Sheath Protector Under Harmonic Over-Voltage

作　　者：方春华[1] 张怡琳 庄立 李放 孙奥琪 胡涛 张瑶 江进波 FANG Chunhua;ZHANG Yilin;ZHUANG Li;LI Fang;SUN Aoqi;HU Tao;ZHANG Yao;JIANG Jinbo(College of Electricity and New Energy,China Three Gorges University,Yichang 443002,China;State Grid Hubei Electric Power Co.,Ltd.,Yichang Power Supply Company,Yichang 443000,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]国网湖北省电力有限公司宜昌供电公司,湖北宜昌443000

出　　处：《电瓷避雷器》2023年第6期110-116,共7页Insulators and Surge Arresters

摘　　要：随着我国多种形式的新能源接入系统,系统暂态过电压问题逐渐显现,持续的高次谐波过电压会导致电缆护层保护器发热甚至爆炸。为了探究高次谐波过电压下电缆护层保护器泄漏电流特征变化规律,本研究搭建了模拟谐波过电压冲击实验平台,对高温老化后的保护器进行谐波过电压实验,分析了总泄漏电流、阻性电流、相位差、阻值等受电压幅值及频率的影响规律。实验结果表明,老化时间每增加100 h,保护器内部电阻减小5%~29%,且实验温度每升高20℃,阻性电流增大11%~38%;当温度为40℃时,保护器在51次谐波过电压作用下相较于基波电压,总泄漏电流增大50.1倍,阻性电流增大26.9倍。在实际线路中多个谐波电压共同谐振,进一步加速了保护器的故障过程。With various forms of new energy sources connected to the system in China,the system transient overvoltage problem gradually emerges,and the continuous high harmonic overvoltage can cause the cable sheath protector to heat up or even explode.In order to investigate the change law of cable sheath protector leakage current characteristics under high harmonic overvoltage,the author builds a simulated harmonic overvoltage impact experimental platform and conducts harmonic overvoltage experiments on the protector after high temperature aging,and analyzes the law of total leakage current,resistive current,phase difference and resistance value affected by voltage amplitude and frequency.The experimental results show that for every 100 h increase in aging time,the internal resistance of the protector decreases by 5%~29%,and for every 20 ℃ increase in experimental temperature,the resistive current increases by 11%~38%;when the temperature is 40 ℃,the total leakage current of the protector increases by 50.1 times and the resistive current increases by 26.9 times under the action of the 51st harmonic overvoltage compared with the fundamental voltage.In the actual line multiple harmonic voltages resonate together,further accelerating the failure process of the protector.

关 键 词：电缆护层保护器 谐波过电压 总泄漏电流 阻性电流 

分 类 号：TM863[电气工程—高电压与绝缘技术]