变压器油中电晕放电特性及产气规律

Corona Discharge Characteristics and Gas Generation Law in Transformer Oil

基于油中电晕放电模型进行大量实验,研究了油中电晕放电的相位谱图及统计特征参量的变化规律,分析了放电发展过程中油中溶解气体的产生和变化规律。实验结果表明,油中电晕放电在负半周首先出现,随着加压时间的增加,正半周会出现少量放电脉冲,放电相位主要集中在270°左右。放电产生的气体以H2、CO和C2H2为主,随着外加电压的升高,气体含量变化呈先增加到一个固定值然后保持稳定、临近击穿时急剧增加的趋势。

Transformer is one of the important equipment of electrical power system and partial discharge would affect the insulation performance of transformer seriously.Because partial discharge is the main factor of the transformer insulation degradation,understanding the emergence and development of partial discharge and the variation law of producing gas in time can determine internal latent fault of transformer.Lots of partial discharge experiments are carried out to research the development characteristic parameters＇ variation law of corona discharge in transformer,and the variation characteristic of dissolved gases in oil is also researched.The results show that the partial discharge first comes in the negative half cycle,and the discharge phase focuses on the 270°or so.In the corona partial discharge in oil the major gases produced are H2,CO and C2H2,and the content of the gas first increases,then remains stable,and finally increases sharply with the rise of voltage