摘要
该文采用时域有限差分法研究电磁波信号在GIS中的传播特性,从而为GIS局放超高频在线检测提供借鉴与参考。首先参照GIS实际试验装置进行建模,然后分别研究了激励源脉冲宽度与幅值对电磁波传播的影响、电磁波在GIS筒体内传播的时延特性、GIS结构变化对电磁传播特性的影响。仿真结果表明,电磁波信号幅值与衰减速度与激励源的脉冲宽度与幅值关系密切,利用此特征可以帮助判别局放源的种类和严重程度;电磁波信号在GIS内传播时呈现明显的时延和幅值衰减特性,此特征有利于进行局放源的定位;GIS结构变化对电磁波的幅值及信号特征均有影响,因此应按传播特性选择传感器放置点,以取得更好的检测效果。
We use the finite difference time domain method to analyze electromagnetic wave propagation characteristics in GIS for the purpose of the UHF on-line monitoring of partial discharge（PD） in GIS.Firstly, a model for detecting PD signals in GIS is built according to the real experimental device to study the influences of the pulse width and amplitude of excitation source, the time delay characteristic and the GIS structure on the electromagnetic wave propagation. Simulation results show that the amplitude and attenuation speed of electromagnetic wave has close relation with the pulse width and amplitude of the excitation source. This feature can be used to determine PD source type and evaluate PD level. The propagation of UHF electromagnetic wave signal in GIS has the time delay and amplitude attenuation effects,which is beneficial to locating position of PD source. And GIS structure imposes effects on both the amplitude and the signal characteristics of the electromagnetic wave, therefore sensor should be properly placed by considering the propagation characteristics of electromagnetic wave in order to obtain better detection.
出处
《高压电器》
CAS
CSCD
北大核心
2015年第6期178-182,190,共6页
High Voltage Apparatus
