Study of flashover performance and voltage correction of DC insulator in icing districts of altitude of 2500 m and below

Based on the results of the DC flashover tests of iced XZP-160, XZP-300 and XWP4-160 insulators carried out in the artificial climate chamber in the High Voltage Laboratory of Chongqing University, China, this paper analyses the effects of altitude and ice on the DC flashover voltage of the three types of insulator. The relations between the DC flashover voltage of iced insulators at high altitude or low atmospheric pressure and the ice amount accreted, as well as the effect of voltage polarity on flashover voltage have been obtained. A voltage correction formula for iced insulators in low atmospheric pressure is also put forward.