高压开关柜局放特性的研究及监测

Research and Monitoring of High Voltage Switchgear PD characteristics

高压开关柜的稳定运行对整个电网的安全稳定具有重要意义,而对开关柜中局部放电的在线监测是了解开关柜健康状态的重要手段。本文主要介绍了高压开关柜中局部放电的特点,比较了超高频检测法和脉冲电流检测法,最终采用基于罗氏线圈的高频脉冲电流检测法用于高压开关柜中的局部放电在线监测,并介绍了罗氏线圈的原理和优点。通过实验表明,该检测系统具有实时在线监测,反应迅速,灵敏度高,价格低廉,安全可靠等特点,十分适合高压开关柜中的局部放电的在线监测。

The safe operation of high voltage switchgear is important to keep the grid security and stability, and it＇s an useful means to understand the working status of the high voltage switchgear through the monitoring of partial discharge. In this paper, we describe the characteristics of partial discharge in high voltage switchgear, and compare the ultra-high frequency detection method with the pulse current detection method. According to the comparison, we chose the current detection method based on Rogowski coil for monitoring partial discharge in high voltage switchgear. Experiments show that the detector had many advantages as monitoring real-time and on-line, rapid response, high sensitivity, low cost, safe and reliable, which prove that the detector is very suitable for monitoring partial discharge in high voltage switchgear.