Study on Rise of Transient Ground Potential Caused by Switching and Closing Operation in 330kV GIS Substation

In this paper, a model of the 330kV GIS substation shell in transient state is established, a simulation calculation about transient enclosure voltage (TEV) generated during switching of disconnector is carried out, and the TEV waveforms and spectral distributions were obtained throughout the shell. The simulation results are compared with the actual experimental data of the substation, and on the basis of verifying the correctness of the simulation calculation, the possible hazards caused by transient elevation of potential to ground are analyzed. The study shows that the maximum value of TEV always appears on the shell of the bushing, which can reach tens kV voltage level and contain complex frequency. At the same time, the transient potential difference between the grounding wire and the grounding terminal of the control room is up to 1000V.