植物油-纸绝缘气隙放电形态及发展特征  

Investigation on Air-Gap Discharge Patterns and Development Characteristics of Vegetable Oil-Paper Insulation

作　　者：崔鲁[1] 陈伟根[1] 杜劲超[1] 李剑[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电工技术学报》2018年第3期618-626,共9页Transactions of China Electrotechnical Society

基　　金：国家杰出青年科学基金(51425702);高等学校学科创新引智计划(111计划)(B08036)资助项目

摘　　要：气隙缺陷是油纸绝缘常见的局部放电缺陷模式。随着植物绝缘油变压器的推广应用,研究植物油-纸绝缘气隙放电及其特征具有重要的意义。论文采用气隙放电模型和模拟油箱,从放电机理的角度对比分析了植物油-纸绝缘与矿物油-纸绝缘气隙放电的起始放电参数,结合电流脉冲波形和RGB统计图谱,对比分析了整个气隙放电发展过程中的形态特征。结果表明,相比于矿物油-纸绝缘,植物油-纸绝缘气隙放电阶段特征更加明确,具有较低的起始放电电压,较小的初始相位,较少的气隙放电双峰脉冲,较小的放电量,较多的放电次数和更明显的"兔耳"谱图。实验结果为有效识别植物油-纸绝缘气隙放电及其发展特征提供了参考。Air-gap defect is a common partial discharge （PD） defect type of oil-paper insulation. With the increasing application of transformers filled with vegetable insulation oils, it is of great significance to investigate the air-gap PD and its characteristics of vegetable oil-paper insulation. In this paper, a typical air-gap model and a simulative oil tank were adopted; from the perspective of PD mechanism, air-gap PD inception parameters of vegetable oil-paper insulation were compared with those of mineral oil-paper insulation; discharge characteristics during the whole air-gap PD development process were investigated by analyzing current pulse waveforms and RGB statistical patterns. It was found that, the air-gap PD characteristics of vegetable oil-paper insulation are more remarkable, with lower PD inception voltage, smaller inception phase angle, fewer double-peak PD pulses, lower charge amplitude, higher repetition rate and more obvious ‘rabbit-ear’ patterns than mineral oil-paper insulation, which provide a reference for identifying air-gap PD and its development characteristics in vegetable oil-paper insulation.

关 键 词：变压器 植物油-纸绝缘 气隙放电 阶段特征 

分 类 号：TM835[电气工程—高电压与绝缘技术]