基于TEV与超声波的开关柜局部放电检测及定位研究

Research on Partial Discharge Detection and Location of Switchgear Based on TEV and Ultrasonic Wave Methods

高压开关柜局部放电的快速准确检测对于保障电网安全运行、提高供电可靠性具有重要意义。论文分析了检测高压开关柜局部放电的TEV方法与超声波方法的原理及相应的优缺点,并研制了TEV传感器。设计了针板放电、内部放电、悬浮放电和沿面放电四种典型的局部放电模型,搭建了一套基于TEV与超声波相结合的局部放电检测实验平台,通过模拟实验,利用TEV与超声波相结合的方法实现了局部放电源的定位,经验证该方法精确度较高,对局放检测有一定的实用价值。

The safe and reliable operation of high voltage （HV） switchgear directly influences the reliability of the whole substation’s power supply, so the partial discharge detection of HV switchgear is particularly important. This paper mainly analyzes the principle of transient earth voltage （TEV） and ultrasonic wave methods of partial discharge detection of HV switchgear, and the advantages and disadvantages of these two methods. Four typical models of partial discharge, namely needle plate discharge, internal discharge, suspended discharge and surface discharge, are designed; and an experimental platform of partial discharge detection based on the combination of TEV and ultrasonic wave is designed. Through simulation experiments, the combination of TEV and ultrasonic wave methods is used to locate the orientation of the partial discharge source. This method is verified to be more accurate and practical for partial discharge detection.