绝缘子污秽状态紫外在线监测研究

Study of ultraviolet online monitoring system for contaminant level of insulators

在环境污染严重的地区,绝缘子污闪事故时有发生,严重威胁着电力系统的安全运行。为了实时监测绝缘子的污秽状态,本文设计了基于紫外脉冲法的污秽绝缘子在线监测系统,采用FX-BW-110/70型复合绝缘子和XP-160型瓷质绝缘子进行模拟试验,采集了不同运行电压、污秽程度以及存在劣质绝缘子时的紫外脉冲。试验结果表明,紫外脉冲强度可以表征绝缘子的污秽放电程度,分析紫外脉冲变化规律可区别劣质绝缘子的影响。本系统采用非接触的方式采集现场数据,监测距离远,信号干扰成分少,可广泛应用于对输电线路和变电站绝缘子的在线监测。

In some districts with severe air pollution, the flashover of insulators takes place frequently and threats the safety operation of power system. In order to realize real-time monitoring for the contamination state of insulators, this paper designed an ultraviolet monitoring system based on ultraviolet pulse method. Simulation tests were executed with this system on composite insulator FXBW-110/70 and porcelain insulator XP-160 under different operating voltages and contamination levels with the presence of faulty insulators, then the number of ultraviolet pulses was counted and sent back to information center. The experimental results proved that the intensity of ultraviolet pulses can characterize the discharge level of contamination insulator, and the variation trend of ultraviolet pulses can distinguish if the discharge source is a polluted or a faulty insulator. This online monitoring system is a kind of non-contact detector with enough wide monitoring distance and low interference, which makes it possible to be applied in overhead transmission line and power station.