基于谐波特征的活体触电判据研究

Research on Live Electric Shock Criterion Based on Harmonic Characteristics

传统的剩余电流断路器仅以电流超过断路器动作电流整定值来判断故障,如果台区漏电流过大,很容易导致剩余电流断路器误动作。为此,提出将谐波变化率最小值阈值与断路器动作电流整定值相结合的判据,来判断线路是否发生触电。首先搭建活体触电实验平台,进行活体不同部位的触电实验;其次,应用快速傅里叶变换提取谐波特征,计算得到谐波变化率最小值的阈值区间;最后,通过人体触电仿真算例验证了活体触电实验的结论,证明了所提判据的可靠性。

For the traditional residual current circuit breaker, fault judgment relies merely on whether the current exceeds the setting value of the action current of circuit breaker. Circuit breaker misoperation of residual current may occur if there is strong residual leakage current in the transformer area. Therefore, the paper proposes a criterion that combines the minimum threshold value of harmonic change rate and action current setting value of circuit breaker is proposed to judge whether electric shock fault occurs in the circuit.Firstly, a live electric shock experiment platform is set up to carry out electric shock experiments in different parts. Secondly, the harmonic features are extracted by FFT transformation, and then the minimum threshold interval of the harmonic change rate is calculated. Finally, the conclusion of the live shock experiment is verified by the human shock simulation, and the reliability of the criterion is verified.