The multi-column parallel zinc oxide arrester has the characteristics of strong absorption capacity on overvoltage and low residual voltage, so it is widely used in high-voltage, extra-high voltage and ultra-high voltage transmission systems. But when the arrester is subjected to normal line voltage, there is a slight leakage current, and the core has a certain temperature rise, which causes the aging of the zinc oxide resistor valve. The degree of aging depends on the temperature distribution and the temperature rise rate. Therefore, when studying on the DC arrester time-varying temperature field distribution is of great significance. In this paper, YH20WDB1-188 multi-column parallel DC zinc oxide arrester is used as the model. According to the heat transfer differential equation and the supplementary equations, the time-varying temperature field simulation calculation is carried out, and the temperature distribution and temperature rise rate of the single core and the whole arrester are compared and analyzed. The simulation results contribute to structural optimization of multi-column parallel arrester and analysis of valve aging characteristics.
Keywords Direct current, Zinc oxide arrester, Temperature rise, Time-varying temperature field, Multiphysics coupling