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Voltage endurance of epoxy resins with microcavity type defects

机译:具有微腔型缺陷的环氧树脂的耐电压性

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This paper presents a progress report on a continuing investigation into the voltage endurance of cast and molded resins, particularly cast epoxy resins. The relation of gas cavity size to the observable discharge magnitude and the stress level on the resin at which discharges can be expected to occur within internal cavities is estimated. This illustrates that, with small cavities, the discharge picocoulomb magnitudes can be well below the usual present limits of detection. Experiments with cast resins in which low level discharges exist indicate the trend of discharge magnitude with voltage and time. Continuing voltage endurance tests of specimens with low level discharges indicate a decreasing time to failure with increasing time of ac stress similar to those with surface discharges of much greater magnitude.
机译:本文提供了一份有关对铸造和模塑树脂,特别是铸造环氧树脂的耐电压性进行持续研究的进展报告。估计了气腔尺寸与可观察到的排出量的关系,以及可预期在内腔内发生放电的树脂上的应力水平。这说明,在小空腔的情况下,放电皮库仑量级可以大大低于通常的检测极限。存在低水平放电的浇铸树脂的实验表明,放电量随电压和时间的变化趋势。连续的低水平放电样品耐压测试表明,随着交流应力时间的增加,失效时间的减少与表面放电量更大的样品相似。

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