基于等效距离的GIS局部放电特高频定位方法  

UHF Location Method of GIS Partial Discharge Based on Equivalent Distance

作　　者：张伟 方舟 黄钟 刘辉 曹沛 ZHANG Wei;FANG Zhou;HUANG Zhong;LIU Hui;CAO Pei(Xi’an XD Switchgear Electric Co.,Ltd.,Xi’an 710016,China)

机构地区：[1]西安西电开关电气有限公司,西安710016

出　　处：《高压电器》2024年第8期92-98,共7页High Voltage Apparatus

摘　　要：针对GIS局部放电特高频定位中,传统幅值法误差较大、时差法硬件开销过高等短板,提出了利用信号经过GIS组件结构产生的幅值衰减推导局放源方位的等效距离法。考虑到不同测点排布与噪声干扰对定位的影响,首先对比3~5个邻近测点的信号幅值与波形特征以明确放电区间,进而根据衰减特征值计算出局放源所在组件。设计并集成了对应的软件功能模块,利用车间252 kV GIS断路器间隔与母线进行了数据采集与定位验证实验。结果表明,等效距离法实现了75%的组件级定位精度与95%的亚气室级定位精度,兼顾了准确性、经济性与实用性,有助于工程现场及时探明缺陷、缩小解体范围。In view of such shortcomings as large error of traditional amplitude method and high hardware cost of TDOA method in UHF location of GIS partial discharge,an equivalent distance method is proposed to derive the location of partial discharge source by using the amplitude attenuation generated by the signal passing through the GIS component structure.Considering the influence of different measuring point layout and noise interference on location,the signal amplitude and waveform characteristics of 3-5 adjacent measuring points are compared firstly to determine the discharge interval,thus calculating the assembly of partial discharge source in accordance with the attenuation characteristic value.The corresponding software function modules are designed and integrated.The data acquisition and location verification experiments are carried out by using 252 kV GIS circuit breaker bay and GIL at the factory.The result shows that the equivalent distance method achieves 75%of the component level location accuracy and 95%of the sub-gas-compartment level location accuracy and takes into account the accuracy,economic performance and practicality,which is helpful to detect defects in time and reduce the scope of disassembly at the project site.

关 键 词：特高频 局部放电 定位 等效距离 信号衰减 

分 类 号：TM855[电气工程—高电压与绝缘技术]