基于紫外光脉冲检测技术的绝缘子电晕特性研究1

首先介绍了利用光电倍增管检测绝缘子电晕产生的紫外光来研究绝缘子电晕特征的研究方法。检测实验表明，电晕紫外光脉冲与电流脉冲有着很好的对应关系，可以采用紫外光作为电晕放电检测特征量。利用该方法检测绝缘子电晕时发现，对于干燥的绝缘子，绝缘子电晕光脉冲中仅含有正电晕脉冲，而当绝缘子表面存在水珠时，光脉冲中明显检测到了负电晕脉冲的存在。该文同时开发了一个自动判断负电晕的时间间隔程序，它能反映负电晕脉冲在电晕中的分布情况。大量的试验证明，如果水珠电晕存在时，绝缘子将会产生大量的负电晕，这也说明水珠将会加剧负电晕，引发负脉冲幅值更快的增长。

Corona Performance of Insulators Based on the UV Pulse Detecting Method1

A novel method is developed for measuring the performance of insulator corona by utilizing the photomultiplier (PMT) to detect the UV light. The experiment shows that the UV light pulses correspond very well with leakage discharge pulses, and the UV light can be used for monitoring the corona condition. When this method is applied to detect the corona of insulators, it is found that, for dry insulators, there exists only positive corona pulse on its corona discharge, while with the droplets on the surface of the insulators, negative pulses are also detected. Meantime, a program for automatic detecting of negative pulses is developed which can display the distribution of negative pulses. Experiments demonstrate that if water droplets exist on the surface of insulators, the negative corona pulses will be produced, which in turn demonstrate that the water droplets will intensify the negative corona and cause the accelerated increase of the amplitude of the negative pulse.