Hao Guo
ABSTRACT
This article studies the influence of different structures and components of GIS on the propagation characteristics of partial discharge signals, and summarizes the influence mechanism. Firstly, the attenuation of basin insulators on various frequency components is relatively large, which will significantly hinder the propagation of partial discharge signals; Secondly, in the horizontal direction of the linear shell, as the ultra-high frequency probe moves away from the partial discharge source, the peak value of the measured signal decreases. As the ultra-high frequency probe moves away from the partial discharge source, the measured signal peak value remains basically unchanged; Thirdly, for L-shaped shells, whether in the horizontal or vertical direction, the overall amplitude will decrease after passing through the L-structure; Fourthly, when electromagnetic waves propagate in a T-shaped structure, the main change is the distribution of higher-order modes in the electromagnetic wave, and there will be strong attenuation in the high-frequency part. The fifth factor is to ignore the above factors. In fact, the length of the GIS shell has little effect on the attenuation of the signal, providing useful guidance for GIS partial discharge live detection.
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