高压开关柜局部放电超声波信号传播特性

Ultrasonic Propagation in Switchgear

开关柜是电力系统重要的组成设备,其正常运行对电网的安全稳定具有重要意义。其常见的故障定位法有电气定位法、幅值定位法、时差定位法等,其中时差定位法为纯声学检测或声电联合检测。超声法虽然抗电磁干扰能力强,但是在检测中易受噪声影响,并且由于超声检测范围小,纯声学定位工作量大,声电联合检测定位可以有效地解决这一问题。本文运用仿真和实验的方法,验证了开关柜内局部放电声源的传播特性,结果表明声电联合检测定位法更具便利性。

The switchgear is an important component of the power system,and its normal operation is of great significance for the safety and stability of the power grid.The common fault localization methods include electrical localization,amplitude localization,time difference localization,etc.Among them,time difference localization is pure acoustic detection or combined acoustic and electrical detection.Although the ultrasonic method has strong resistance to electromagnetic interference,it is easily affected by noise in detection.Moreover,due to the small detection range of ultrasound and the large workload of pure acoustic positioning,the combination of acoustic and electrical detection and positioning can effectively solve this problem.This article uses simulation and experimental methods to verify the propagation characteristics of partial discharge sound sources in switchgear,and the results show that the combined detection and positioning method of sound and electricity is more convenient.