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The intrinsic electric strength of polythene and its variation with temperature

机译：聚乙烯的固有电强度及其随温度的变化

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The development of a method of measuring the electric strength of polythene is described. Details are given of apparatus for moulding recessed specimens and for measuring the test thickness at the base of the recess. Systematic investigation of the factors involved in electric-strength measurements????????thickness of specimen, time of application of voltage, radius of curvature of the recess, polarity, ambient medium, and electrode material????????shows that the method gives a value of d.c. electric strength that is an intrinsic property of the polythene. The d.c. electric strength is substantially independent of specimen thickness over the range tested (0-0.008 in). The variation of d.c. electric strength with temperature shows a measure of agreement with the electronic theory of disruptive discharge developed by Frohlich and Von Hippel. At 25???????° C and below, it is about 17 MV/in, changing little with temperature down to ???????? 200???????° C; above 25???????° C it falls steadily to a value of about 2 MV/in at the melting point (c. 115???????° C). A preliminary investigation of the factors involved in the breakdown of polythene at power frequencies is described. Using the same electrode system as for the d.c. tests, the observed a.c. electric strength decreases with increasing specimen thickness and time of application of voltage. A.C. values are lower than d.c. values at corresponding temperatures, the difference being less at low than at high temperatures. It is suggested that these differences between a.c. and d.c. breakdown may be associated with internal heating due to ionic discharges or dielectric loss.
机译：描述了测量聚乙烯的电强度的方法的发展。详细介绍了用于模制凹陷样品和测量凹陷底部厚度的设备。对涉及电强度测量的因素进行系统研究????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????显示该方法给出的值为dc电强度是聚乙烯的固有特性。直流电在测试范围（0-0.008英寸）内，电强度基本上与样品厚度无关。直流电的变化电强度随温度的变化表明与Frohlich和Von Hippel提出的破坏性放电电子理论相一致。在25°C或更低的温度下，约为17 MV / in，随着温度降低到????????，变化很小。 200°C;°C;熔点高于25℃时，在熔点（约115℃）下稳定地降至约2MV / in。描述了在功率频率下涉及聚乙烯分解的因素的初步研究。使用与直流电相同的电极系统测试中，观察到的交流电随着样品厚度的增加和施加电压的时间，电强度降低。交流电值低于直流电相应温度下的温度差，低温时的差小于高温时的差。建议交流之间的这些差异。和d.c.由于离子放电或介电损耗，击穿可能与内部加热有关。

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