泄漏电流幅值与波形畸变率联合表征染污绝缘子运行状态的研究

Representing Running State of Polluted Insulator by Amplitude of Leakage Current and Waveform Distortion Rate

为有效预警污闪事故,文中以单片XP-70型瓷绝缘子为研究对象,在人工雾室里进行了大量的交流人工污秽试验,并且基于污闪发展全过程3区段的思想,利用时频域结合的分析方法,揭示出污闪过程中,3区段泄漏电流波形的典型特性,以及泄漏电流的幅值和波形畸变率的变化特点。试验研究结果表明:泄漏电流幅值和波形畸变率是能够有效地描述泄漏电流波形,他们的变化规律与绝缘子表面的污秽度,污秽分布和气压等参量无关。研究结果对于建立基于利用泄漏电流表征线路绝缘子的运行状态系统具有一定的参考价值。

To develop an early warning method for contamination flashover, a large number of artificial contami- nation AC tests were conducted on the XP-70 insulator in an artificial fog chamber. Considering the three stages of contamination flashover as the variations of the 1 process, the typical waveform features of leakage current on the insulator surface as well eakage current amplitude and waveform in both time domain and frequency domain. The results show distortion rate in these three stages were revealed the amplitude of leakage current and the rate of waveform distortion can effectively describe the characteristics of leakage current waveform, and their variations are independent on such parameters as the equivalent salt deposit density and contamination distribution on the insulator, and air pressure. This study may provide a reference for developing a leakage current-based insulator monitoring system.