基于小波包能量的漏电保护方案研究

Research on Leakage Protection Scheme Based on Wavelet Packet Energy

摘要:

现有剩余电流保护器多以总剩余电流或故障电流有效值作为动作判据，阈值固定，难以识别触电类型。为了减轻因人身触电事故造成的严重后果，针对低压配电网，文中研究了一种基于小波包能量的漏电保护方案。利用滑动时间窗计算剩余电流的小波包能量相对熵，根据相对熵的变化大小判断是否为生命体触电，并在此基础上提出了漏电保护方案。文中模拟了电阻、猪肉和兔子等不同触电类型的实验，实验结果证明所提方法的正确性和有效性，对于开发新一代剩余电流保护器具有参考价值。

Abstract:

Most of the current protective methods act based on the total residual current with a fixed threshold, which is difficult to identify the types of electric shock. In order to reduce the serious consequence caused by electrical shock, and aiming at low-voltage distribution network, a leakage protection scheme based on wavelet packet energy is studied. Relative entropy of wavelet packet energy is calculated according to residual current through sliding time window. The change value of relative entropy serves as a criterion for electrical shock of life entity. On this basis, the leakage protection scheme is proposed. The resistance, pork and rabbit are used to simulate different electric shocks. The results show the correctness and effectiveness of the proposed method, which is of a certain significance in developing new residual current devices.