基于超声波法的长距离超高压GIL电弧故障定位

Long-distance UHV GIL Arc Fault Location Based on Ultrasonic Method

武汉市谭鑫培路城市地下综合管廊气体绝缘金属封闭输电线路(GIL)工程建成后将成为世界上最长的气体绝缘输电线路,一旦发生电弧击穿,将严重影响整条输电线路的电能输送,造成很大的经济损失,因此有必要对其电弧故障定位策略进行研究。通过比较各类常用GIL故障定位方法,选择超声波法作为故障定位方法,对超声波法定位技术的理论进行了研究,包括GIL击穿时的超声信号特征以及超声信号在GIL中的传播特性,根据工程实际情况,提出了基于超声波法的电弧故障定位策略及系统安全性设计,以实现故障的精确定位和快速修复。

After the completion of the GIL transmission project of the urban underground comprehensive pipeline gallery on Tanxinpei Road,it will become the world′s longest gas-insulated transmission line.Once an arc breakdown occurs,it will seriously affect the power transmission of the entire transmission line and cause great economic losses,so it is necessary to study the arc fault location strategy.This paper compares various commonly-used GIL fault location methods,chooses ultrasonic method as the fault location method,and studies the theory of ultrasonic location technology,including the characteristics of ultrasonic signals during GIL breakdown and the propagation characteristics of ultrasonic signals in GIL.According to the actual situation of Tanxinpei GIL project,an arc fault location strategy and system safety design based on the ultrasonic method are proposed to achieve accurate fault location and rapid repair.