低压配电线路剩余电流断路器动作判据的研究  

Research on operation criterion of residual current circuit breaker for low voltage distribution line

作　　者：李军[1] 邓晖 蔡峥嵘 吕干云[1] 刘克天 LI Jun;DENG Hui;CAI Zhengrong;LYU Ganyun;LIU Ketian(School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing Jiangsu 211100,China)

机构地区：[1]南京工程学院电力工程学院,江苏南京211100

出　　处：《中国安全生产科学技术》2022年第3期217-223,共7页Journal of Safety Science and Technology

基　　金：江苏省科技副总项目(FZ20200049);江苏省“六大人才高峰”项目(TD-XNY-004)。

摘　　要：为了改善剩余电流断路器频繁误动作的问题,提出以偶次谐波变化率最小值阈值、工频变化量阈值、剩余电流动作整定值相结合的三重判据。首先,搭建活体触电试验平台,获取活体不同部位的多组触电试验数据,利用S变换提取触电波形谐波特征,并计算出触电时刻偶次谐波变比率最小值阈值和工频变化量阈值。其次,搭建人体触电仿真模型,发现存在相似的触电电流谐波特征规律,与传统的动作整定值相结合建立三重综合判据,并以仿真算例验证判据的可靠性。研究结果表明:所提判据不仅能有效改善剩余电流断路器频繁误动的问题,也能预防人体触电。In order to improve the problem of frequent misoperation of residual current circuit breaker,a triple criterion combining the minimum value threshold of even harmonic change rate,power frequency change threshold and residual current action setting value was proposed.Firstly,a living body electric shock test platform was built to obtain multiple groups of electric shock test data from different parts of the living body.The harmonic characteristics of electric shock waveform were extracted by S-transform,and the minimum value threshold of even harmonic change ratio and power frequency change threshold at the time of electric shock were calculated.Secondly,a human electric shock simulation model was built,and it was found that there were similar harmonic characteristics of electric shock current.Combined with the traditional action setting value,the triple comprehensive criterion was set up,and the reliability of the criterion was verified by a simulation example.The results showed that the proposed criterion could not only effectively improve the problem of frequent misoperation of residual current circuit breaker,but also prevent the electric shock of human body.

关 键 词：误动作 三重判据 谐波特征 活体触电试验 人体触电仿真模型 

分 类 号：X934[环境科学与工程—安全科学]