山东电力技术2024，Vol.51Issue(11)：93-100,8.DOI:10.20097/j.cnki.issn1007-9904.2024.11.009
特高压GIS开关设备电磁波衰减特性及在线监测传感器布点方案研究
Research on the Attenuation Characteristics of UHF Electromagnetic Waves Inside UHV GIS Switchgear
摘要
Abstract
Online monitoring sensors are installed inside the enclosure of the UHV gas insulated switchgear(GIS)for real-time monitoring of ultra-high frequency(UHF)electromagnetic wave signals generated by partial discharge.However,the UHF electromagnetic wave signals will attenuate to varying degrees,while propagating inside the GIS.If the online monitoring sensor arrangement is not reasonable,it may not be sufficient to detect the attenuated electromagnetic wave signals,especially for switchgear with numerous internal components,such as circuit breakers and disconnector chamber.The attenuation process of electromagnetic waves is more complex and cannot be calculated through simple empirical formulas,therefore,it is necessary to conduct research on the attenuation characteristics of electromagnetic waves inside UHV switchgear and the layout scheme of online monitoring sensors.This article established a three-dimensional scale simulation model based on the actual structure and size of domestic mainstream UHV switchgear,and analyzed the attenuation characteristics of electromagnetic wave signals within the frequency range of 300～1500 MHz.The results showed that due to the attenuation effect of many components,the average propagation coefficient of the UHV circuit breaker chamber was about 10 dB lower than that of the disconnector chamber.Therefore,it is necessary to meet the requirement that the average forward propagation coefficient between two adjacent sensors is not less than-70 dB,which provides a basis for further research on the layout scheme of online monitoring sensors for UHV switchgear intervals.The results showed that three sensors need to be arranged in two CT chambers and the transition chamber near the branch within a switch interval,which could provide references for the online monitoring sensor placement for UHV GIS.关键词
特高压GIS/局部放电/特高频电磁波/衰减特性/在线监测传感器Key words
UHV GIS/partial discharge/UHF electromagnetic waves/attenuation characteristic/on-line monitoring sensor分类
信息技术与安全科学引用本文复制引用
张丕沛,白卓,于吉,郭晨瑞..特高压GIS开关设备电磁波衰减特性及在线监测传感器布点方案研究[J].山东电力技术,2024,51(11):93-100,8.基金项目
国家电网有限公司科技项目(520626220048). Science and Technology Project of State Grid Corporation of China(520626220048). （520626220048）
