UHF（ultra-high frequency） partial discharge detection is an important technical means for the condition monitoring of GIS

verifying the reasonableness of sensors arrangement and the performance of the monitoring system by the signal injection is an important means to ensure the effective implementation of condition monitoring. The propagation and attenuation of UHF signals vary with different voltage levels GIS structures

so the injection amplitudes of verification pulse are different. In this paper

the simulation models of straight cavity

L type and T type of 110

220

500

1 000 kV GIS are established based on real GIS

comparative study and analysis the attenuation differences and propagation rules of UHF signals of the same structure of different voltage levels GIS and the same voltage level of different structures through CST simulation software. Based on above

the attenuations of various typical structures of GIS with different voltage levels are obtained. Through this research laid a foundation for the reasonable evaluation of UHF sensors arrangement and the amplitude determination of site verification pulse injection.