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800kV DC arrester is widely used in UHV converter stations. If long-term damp or breakdown short-circuit of the resistor is degraded during operation, the potential distribution of the arrester is unreasonable and the leakage current increases, resulting in arrester heating or even explosion, so it’s necessary to analyze and calculate the potential distribution and leakage current under different degrees of degradation. In this article, the ANSYS simulation model of 800kV DC arrester was built, which was used to calculate the potential distribution and leakage current of the arrester when long-term damp and breakdown short-circuit, and the correctness of simulation results are verified by field test of leakage current.

Simulation of Potential Distribution and Leakage Current of 800kV DC Arrester under Different Degrees of Degradation