GIL中金属尖端缺陷的PD频率特性及传播特性研究  

Study on the Frequency Characteristics and Propagation Characteristics of PD of Metal Tip Defects in GIL

作　　者：徐英花[1] 吴勇峰[1] XU Yinghua;WU Yongfeng(Hunan Institute of Engineering,Xiangtan 411100,China)

机构地区：[1]湖南工程学院,湖南湘潭411100

出　　处：《电工技术》2023年第16期163-165,共3页Electric Engineering

摘　　要：气体绝缘输电线路(GIL)是现代电网中的一种重要设备,其内部局部放电会导致电网严重中断,因此对其内部局放进行检测具有重要意义。采用一个220 kV单相GIL实验平台,研究金属尖端缺陷产生的特高频局放信号的频率特性及传播特性,实验结果表明特高频信号在GIL中穿透能力很强,在L型拐角处虽然有衰减,但仍然能够获得较高的检测灵敏度。该实验结果为特高频局放传感器的布置规则提供了实验依据。Gas insulated transmission line(GIL)is important equipment in modern power grid.Its internal partial discharge will cause serious interruption of the power grid,so it is of great significance to detect its internal partial discharge.In this paper,a 220 kV single-phase GIL experimental platform is used to study the frequency characteristics and propagation characteristics of UHF partial discharge signals generated by metal tip defects.The experimental results show that UHF signals have strong penetration ability in GIL.Although there is attenuation at the L-shaped corner,they can still obtain high detection sensitivity.The experimental results can provide experimental basis for the arrangement rules of UHF partial discharge sensors.

关 键 词：GIL 局部放电 特高频信号 传播特性 频率特性 

分 类 号：TM755[电气工程—电力系统及自动化]