基于紫外成像的110kV复合绝缘子串冰闪预警

为对复合绝缘子串的覆冰闪络放电进行预警,利用紫外成像仪对覆冰的复合绝缘子进行非接触带电检测.通过对复合绝缘子的大量融冰闪络试验,同时对冰闪过程中的泄漏电流和紫外图像进行对比分析,提出了110kV复合绝缘子串在覆冰状态下的冰闪紫外预警方法.结果表明:复合绝缘子串融冰闪络放电过程中的泄漏电流脉冲分量和紫外光子数在一定程度上具有对应关系.依据放电强度与产生的紫外光子数具有相关性的特点,提出了覆冰绝缘子放电过程紫外预警三区段法,为评估覆冰绝缘子的污秽状态和闪络预警提供了方法.

Icing flashover warning of 110 kV composite insulators based on ultraviolet detection

In order to monitor the icing flashover lightning process of composite insulators,and research its flashover warning,the composite insulators are detected for non-contact of live test using ultraviolet imaging.Through a large number of melting and icing flashover experiments of composite insulators,and comparatively analyzing the leakage current in icing flashover and the ultraviolet image,a method for icing flashover warning of 110 kV composite insulators is presented.The research results show that there is a relationship to some extent between the pulse weight of leakage current and the number of ultraviolet photons.Based on this,this article proposes a three-section method for ultraviolet warning of the icing flashover lightning process of composite insulators so as to provide a method for assessing contaminated state and flashover warning of iced insulators.