Abstract
The partial discharge (PD) in gas‐insulated switchgear (GIS) will stimulate the ultra‐high frequency (UHF) electromagnetic (EM) wave signal of 300 MHz to ∼3 GHz. The PD signal will appear in the resonance, distortion, and attenuation during propagating in GIS due to the complexity of the internal structure of GIS. Thus, it increases the intricacy of detection and evaluation. The Finite difference time domain (FDTD) algorithm has been used in this paper to investigate the influence of the insulator structure parameters on the propagation characteristics of the UHF signal. The results show that the dielectric loss of insulator causes the attenuation of the UHF signal inside and outside GIS, with an increase in the thickness and dielectric constant of the insulator. The shape of the insulator has little influence on the propagation characteristics of the UHF signal within GIS. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
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