低压配电线路剩余电流断路器动作判据的研究

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...

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

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.