输电线路放电声发射现象的试验

Experimental Research on Acoustic Emission of Discharge from the Power Transmission System

试验研究了输电线路放电电脉冲、放电伴随声发射波及二者间的关系,在大量试验的基础上,总结了绝缘子的内部放电、绝缘子表面污秽放电、线路的尖端电晕、接触不良放电以及近区的雷电等不同形式放电伴随声发射波的特征。结果发现,利用放电电信号和声信号之间的相位差,可以实现输电线路放电源的声发射定位,利用不同形式放电声发射波的外形、周期性和对称性的差别,可以有效地识别放电的形式并进行故障诊断。

During the discharging process of the power transmission system, the electric impulses, the acoustic emission （AE） waves and the relation between them are studied by experiment in laboratory. Based on a large number of experiments the common characteristics of the AE wave of the interior discharge from the insulator, contaminant discharge from the insulator, corona from the transmission line, discharge from bad contact and thunderbolt are summarized, respectively. It is found that the discharge source can be located by means of the phase-shifting between the electric impulse and the acoustic emission wave of the same discharge. The type of discharge can also be identified through the difference in periodicity, the shape and the symmetry of the AE wave of discharge from the power transmission system.