超声法在检测高压开关柜内局部放电的应用

摘要

高压开关柜是电力系统中的关键设备之一，其内部电气元件分布繁多、排列紧密、绝缘裕度很小，易出现局部放电现象。为此以准确定位局部放电的位置为目的，提出了基于梯度收缩法的超声波定位算法，具体介绍该方法的基本原理、检测方法和判断结果。将此算法用于某企业的35 kV真空开关柜局部放电检测中，检测结果表明，该方法对高频干扰下的局部放电现象的检测更为精确有效，也为高压开关柜的故障检测以及安全运行提供了技术依据。%High tension switchgear is one of the key equipments in power system,it internal equipments are distributed richly, arranged closely and had a very small margin of the insulating and proned to partial discharge phenomena. Taking partial discharge location for the purpose of accurate positioning , put forward the ultrasonic location based on the gradient shrink , introduced the basic principle, the method and result of detectionmethod.The algorithm is used in the detection of partial discharge in 35 kV vacuum high tension switchgear of a company, the final detection results show that, the method of detecting the partial discharge phenomena in high frequency interference is more accurate and more efficient ,but also provide the technical basis for the failure of high tension switchgear detection and safety operation.