ZHAO Ying-feng, LIU Bin, LYU Wei, LUO Yun-xiang, SUN Chao, SHI Wei, FANG Tai-xun
Abstract: The fracture insulation test is one of the basic test items of the primary and secondary deep melt pole-mounted switch (pole opening). In this paper, the theoretical potential of the mechanism box shell is obtained according to the distribution topology of sample capacitance and stray capacitance, and the flashover voltage test of the mechanism box shell and the insulating pad is carried out, and the fracture insulation test is carried out by using improved measures. The results show that, when the inlet side is pressurized, the potential of the casing of the mechanism box shell is greater than that of the outlet side, which confirms the breakdown phenomenon of the fracture test.The measured potential value of the mechanism box shell is similar to the theoretical value. The insulation pad has the worst insulation performance when it is dirty, and the flashover voltage is 37% of the clean state. According to the thickness of the insulation pad and the degree of dirt to adjust the placement position of the mechanism box shell, the fracture insulation test passed. In the fracture insulation test of the of the primary and secondary deep melt pole-mounted switch, it is necessary to pay attention to the potential of the shell of the mechanism box shell to prevent the shell from interfering with the test results by the discharge to the ground.
Key words: deep melt pole-mounted switch; fracture insulation; mechanism box shell; potential; stray capacitance; flashover
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