ASTM D3755在直流电压作用下固体电绝缘材料介电击穿电压及介电强度标准试验方法
日期:2012-02-10 17:44
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Experience indicates that the breakdown value obtained with direct voltage usually will be approximately 2 to 4 times the rms value of the 60-Hz alternating-voltage breakdown.
For a nonhomogeneous test specimen, the distribution of voltage stress within the specimen is determined by impedance (largely capacitive) with alternating voltage. With an increasing direct voltage, the voltage distribution may be still largely capacitive, but depends partly on the rate of voltage increase. After stead
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