摘要
根据中性点经ZnO接地系统下发生不同故障时高频分量的差异性特点,提出了中性点经ZnO非线性电阻接地系统的故障识别方法。首先,利用小波多尺度变换分析不同故障时高频分量的衰减性差异,其次,利用Prony算法提取高频分量的幅值信息,并计算固定时间窗内的幅值比提出识别判据,最后,结合实际系统继电保护方案及ZnO非线性电阻作用的有效性形成故障识别方法。通过大量仿真及计算表明,无论故障点位置在何处,该方法均能够正确、有效识别瞬时性故障和永久性故障。
A fault identification method based on ZnO nonlinear resistance is proposed by considering the difference characteristics of high frequency components in different faults when the neutral point goes through ZnO grounding system.By using discrete wavelet,the multi-resolution analysis on attenuation difference of high frequency components in different faults is performed.Then,the amplitude information of high frequency components is extracted by Prony algorithm,and the fault identification criterion is put forward by calculating the amplitude ratio in a fixed time window.Finally,a fault identification method is proposed based on the practical system relay protection scheme and the effectiveness of ZnO nonlinear resistance.A lot of calculation results and simulation results show that wherever the fault location is,the transient fault and permanent fault can be correctly and effectively identified.
作者
谭王景
王倩
郑航
刘骞
Tan Wangjing;Wang Qian;Zheng Hang;Liu Qian(Shaanxi Polytechnic Institute,Xianyang 712000,China;Xi'an University of Technology,Xi'an 710048,China;State Grid Shaanxi Electric Power Company Overhaul Company,Xi'an 710075,China)
出处
《电子测量技术》
2020年第3期59-65,共7页
Electronic Measurement Technology
基金
国家自然科学基金项目(51507135)
陕西工业职业技术学院科研项目(ZK19-17)资助。
