GIS局部放电光、电信号传播特性对比研究  

Comparative Study on Propagation Characteristics of Optical and Electrical Signals During Partial Discharge in GIS

作　　者：庞先海 顾朝敏 路士杰 董驰 李天辉 韩旭涛 PANG Xianhai;GU Chaomin;LU Shijie;DONG Chi;LI Tianhui;HAN Xutao(State Grid Hebei Electric Power Co.,Ltd.Electric Power Science Research Institute,Shijiazhuang 050021,China;Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,石家庄050021 [2]西安交通大学,西安710049

出　　处：《高压电器》2023年第8期146-153,共8页High Voltage Apparatus

基　　金：国网河北省电力有限公司科技项目资助(kj2022⁃063)。

摘　　要：GIS局部放电是造成绝缘材料劣化、电气设备故障的主要原因,检测GIS腔体内部的局部放电情况,有助于保证电力系统的安全可靠运行。然而在实际工程中,GIS内部结构较为复杂,不同弯角和绝缘子结构必然会对电磁波和光信号的传播特性产生一定的影响。文中根据252kVGIS的结构尺寸,建立仿真模型,研究不同距离、不同弯角结构、不同绝缘子下电磁波和光信号传播特性的差异,得到电磁波和光信号在设备腔体内部的变化规律。仿真结果表明,随着与放电源距离的增大,电磁波信号在400mm以外电场强度幅值近似呈线性衰减趋势,光信号强度整体呈指数衰减的趋势;L型、T型弯角结构对电磁波和光信号均有较强的衰减,但电磁波在弯角结构中反射严重,原始波与反射波叠加会造成信号强度增加;放电信号在经过不同绝缘子结构时,光信号的衰减远大于电磁波信号,盆式绝缘子比圆盘式对电磁波信号的衰减作用更大,光信号的传播依赖于开孔的大小。文中的研究为实际特高频、光传感器的安置提供一定的理论指导。Partial discharge of GIS is the main cause of degradation of insulation material and fault of electrical equipment.Detection of partial discharge inside the GIS compartment is helpful to ensure safe and reliable opera-tion of power system.However,in practical project,the internal structure of GIS is more complex,and different bending angles and insulator structures will inevitably have a certain impact on the propagation characteristics of electromagnetic waves and optical signals.In this paper,according to the structure size of 252 kV GIS,a simulation model is set up to study the difference of electromagnetic wave and optical signal propagation characteristics under different distances,different corner structures and different insulators,and the variation of electromagnetic wave and optical signal inside the equipment compartment is obtained.The simulation results show that with the increase of the distance from the discharge source,the amplitude of the electric field intensity of the electromagnetic wave sig-nal away from 400 mm is approximately linearly attenuated and the intensity of the optical signal is exponentially at-tenuated.The L-shaped and T-shaped corner structures have strong attenuation to electromagnetic wave and optical signal,but the electromagnetic wave is seriously reflected in the corner structure,and the superposition of the origi-nal wave and the reflected wave will cause the signal intensity to increase.When the discharge signal passes through different structures of insulators,the attenuation of optical signal is much greater than that of electromagnetic wave signal.The attenuation effect of spacer insulator to electromagnetic wave signal is greater than that of disc insulator,and the propagation of optical signal depends on the size of opening.The research in this paper provides some theoret-ical guidance for the placement of actual UHF and optical sensors.

关 键 词：GIS 局部放电 特高频法 光检测法 传播特性 

分 类 号：TM855[电气工程—高电压与绝缘技术] TM595