摘要
气体绝缘组合电器(GIS)内部发生局部放电时,产生的特高频(UHF)电磁波信号中包含了主模TEM波和高次模TE、TM波。为分析这3种模量在GIS同轴管道中的传播、衰减特性,构建了一个首、末两端均带锥型匹配端的同轴波导模型;采用时域有限差分(FDTD)的方法,仿真了置于首端匹配锥内的局放源的UHF信号在同轴波导系统内传播、衰减的过程,得到了各模量在传播过程中幅值、能量参数的变化规律。研究结果表明,UHF信号在同轴波导系统传播时,TEM波的传播能力与自身频率、探针-局放源间的夹角φ均不相关;TE、TM波为色散波,伴随着频率的升高,衰减程度逐渐增大,两者的传播能力也均与φ相关,且TM波传播能力的畸变程度要甚于TE波,但两者的畸变程度均与自身频率无关。
The ultra-high frequency（UHF） electromagnetic waves signal contains a dominant mode TEM wave and high-order modes TE,TM waves when partial discharge occurs in the GIS.In order to analyze the attenuation characteristics of these three models of electromagnetic waves in GIS coaxial transmission pipeline,using the finite difference time domain method（FDTD）,we constructed a coaxial waveguide system with matching models at the both ends,and placed the PD source inside one of the matching cones,then investigated the amplitude and energy change characteristics by simulating the three modes of UHF signals which were excited in the tapered matching model and propagate in the coaxial waveguide system.The simulation results show that when the UHF signal transmits in the coaxial waveguide system,the dominant mode TEM is a non-dispersive wave,and its ability to communicate with the probe-PD source is independent of the angle φ.In addition,high-order mode waves TE,TM wave is dispersive wave,that is,along with the frequency increases,the attenuation is gradually increased,for different transmission channels（different angle φ）,the distortion of TM wave is greater than the TE wave,but the distortions of both are independent of frequency.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第3期726-731,共6页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724508)~~
