全绝缘管型母线振荡波检测技术试验研究

Experimental Study on the Detection Technology of the Oscillation Wave of the Insulated Tube

绝缘管母易因绝缘击穿引发停电事故,造成较大经济损失。针对10 kV绝缘管母故障特点,制作了6类绝缘管母典型绝缘缺陷故障模型,采用振荡波技术开展绝缘管母局部放电检测。结果表明:正常绝缘管母的起始放电电压远高于有缺陷的绝缘管母,正常绝缘管母在1.7 U_(0)即14.79 kV时开始出现局部放电信号,而有缺陷的绝缘管母起始放电电压皆小于等于1.3 U_(0)即11.3 kV;得到使用振荡波法识别绝缘管母缺陷的方法,对1.5 U_(0)即13.05 kV电压下的局部放电量进行分析,当局部放电量超过200 pC时,可以认为绝缘管母存在绝缘缺陷。

Insulated tubes were prone to power failure accidents caused by insulation breakdown,resulting in great economic losses.According to the fault characteristics of 10 kV insulation bus,six typical insulation defect fault models of insulation bus were made,and the partial discharge detection of insulation bus was carried out by using oscillating wave technology.The results showed that the initial discharge voltage of normal insulated bus was much higher than that of defective insulated bus,and the partial discharge signal of normal insulated bus begun to appear at 1.7 U_(0),that is,14.79 kV,while the initial discharge voltage of defective insulated bus was less than or equal to 1.3 U_(0),that is,11.3 kV.The method of identifying the defects of the insulating tube bus by using the oscillating wave method was obtained.The partial discharge at 1.5 U_(0),that is,13.05 kV voltage was analyzed.When the partial discharge exceeds 200 pC,it can be considered that the insulating tube has insulation defects.