复合绝缘子耐电腐蚀特点及其电蚀老化区域性的差异

The Characteristic of Electrical Corrosion-proof of Composite Insulators and Its Regional Difference of Electrical Corrosion Aging

为了了解复合绝缘子外绝缘材质电蚀老化状态和区域性的差异,对Al(OH)3耐电腐蚀机理、外绝缘材质中Al(OH)3颗粒分布状态和环境污湿因素的实际情况进行了研究。Al(OH)3颗粒分解成水蒸气、析出白色粉末状氧化铝,并催化生成二氧化碳,将使外绝缘材质逐渐微观减薄和加大表面的粗糙度,而引起电蚀老化的污湿环境因素,近期不可能得到改善,因此必然引起其电蚀老化出现区域性差异。此外,外绝缘憎水表面污珠场强变化引起的电晕也是促使电蚀老化的重要因素。

In order to know the electrical aging status of composite insulator and its regional defference,the electrical corrosion-proof mechanism of Al(OH) 3 ,the particle distribu-tion of Al(OH) 3 in insulation materials and the factors of environmental contamination and humidity are studied in this article.Al(OH) 3 will decompose into water and white pow-der of oxidized aluminum resulting in the thinning of insu-lation material and the roughening of surface.The environ-mental factors causing electrical corrosion such as contami-nation and humidity can not be improved in a short term,so the aging degree of electrical corrosion in different region will be different.In addition,the corona caused by water droplet in the hydrophobic surface is an important factor contributing to electrical corrosion.