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首页> 外文期刊>Proceedings of the IEE - Part IIA: Insulating Materials >Electric discharges in air-gaps facing solid insulation in high-voltage equipment
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Electric discharges in air-gaps facing solid insulation in high-voltage equipment

机译：高压设备中面对固体绝缘的气隙中的放电

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摘要

The performance of high-voltage alternators under conditions of over-voltage is materially improved by the application of an insulating sheathing to exposed parts of the bare earthed metal. The authors first derive the physical explanation for this observation from experiments using auto-photographic recording methods. These experiments are then expanded to cover other phenomena observed with discharges between insulated electrodes and lead to problems of discharges in voids. In particular, two hitherto unexplained phenomena are considered: the increase of discharge current with rising voltage, and the origin of the long discharge-free range in the decaying part of alternating voltages. Both these observations can be explained by the loss of some of the surface charges left from earlier discharges due to local reversals of the electric field. Some of the explanations of the probable mechanism by which charges are lost must still be considered as tentative, and more experimental evidence will be needed for a complete clarification of the processes involved. The results give some information on the effect of harmonics on internal discharges, which have been observed to lead to accelerated ageing of dielectrics.
机译：通过对裸露的接地金属的裸露部分施加绝缘护套，可以大大改善高压交流发电机在过压条件下的性能。作者首先从使用自动照相记录方法进行的实验中得出了这一现象的物理解释。然后将这些实验进行扩展，以涵盖在绝缘电极之间发生放电时观察到的其他现象，并导致空隙放电问题。特别地，考虑了两个迄今无法解释的现象：放电电流随电压的升高而增加，以及交流电压的衰减部分中较长的无放电范围的起源。可以通过早期放电由于电场的局部逆转而留下的一些表面电荷的损失来解释这两种观察结果。关于丢失电荷的可能机制的某些解释仍然必须被视为是尝试性的，并且将需要更多的实验证据来完全弄清所涉及的过程。结果提供了一些有关谐波对内部放电的影响的信息，据观察，谐波会导致电介质加速老化。

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