The insulation characteristic of insulator in vacuum is researched in the process of the high voltage breakdown along the insulator surface in vacuum, which is called vacuum surface flashover.
绝缘子的真空表面绝缘特性研究真空下的高压沿绝缘子表面击穿物理过程，称真空表面闪络过程。
The difficulty to estimate insulation life of large electrical machin es lies in how to estimate residual breakdown voltage according to various parameters measured.
大电机绝缘寿命预测的困难在于如何根据各种测得的参数及其变化趋势预测残余击穿电压。
The heat fault of the electric equipment can cause insulation down and breakdown and makes the equipment damage, even gives rise to fires.
电气设备热故障会导致绝缘下降并击穿，使设备损坏，甚至引起火灾。
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