Abstract: The arrester leakage current leads to a certain temperature rise of the core body,which in turn causes the aging of the zinc oxide resistance valve.The degree of aging depends on the temperature rise in addition to the temperature distribution.Therefore,it is of great significance to study the time-varying temperature field distribution of DC arresters.In this paper,a YH20WDB1-188 multi-column parallel DC zinc oxide arrester is taken as an example.Based on the heat transfer differential equation and supplementary equation,a time-varying temperature field simulation calculation is performed.The calculated results of the different positions of the arrester are consistent with the experimental data.It also compares and analyzes the overall temperature distribution and heating speed of the single-core core and the arrester.The simulation analysis results are helpful for the optimization of the structure of the multi-pillar parallel arrester and the analysis of the aging characteristics of the resistor chip.

Key words: zinc oxide arrester, time-varying temperature rise, temperature distribution, multiphysics coupling