中国电机工程学报Issue(36)：6554-6561,8.DOI:10.13334/j.0258-8013.pcsee.2014.36.023
交直流叠加电压作用下油纸绝缘内部气隙放电发展过程
Development of Discharge of Internal Gas-gap Defect in Oil-paper Insulation Under AC and DC Combined Voltage
摘要
Abstract
The existence of gas-gap in insulation will accelerate the aging of converter transformer oil-paper insulation Unlike an AC transformer, converter transformer internal insulation is under AC and DC combined voltages in a long period. The discharge phenomenon is different from AC transformer. This paper established a set of oil-paper insulation partial discharge test platform under AC and DC combined voltage. A variety of methods were used for long-term monitoring in the internal gas-gap discharge in oil-paper insulation, finally the trend curves in different experimental stages were drawn. According to the development characteristics of partial discharge in oil-paper insulation, the PD evolution could be divided into 3 stages. The results show that: The partial discharge under AC and DC combined voltages occurs in the negative half cycle firstly, with the stage developing, the partial discharge phase widened gradually, and finally the partial discharge appears in the positive half cycle. The partial discharge repetition rate also increases. Meanwhile, there are many differences in PD characteristics between AC and AC-DC combined voltages. The diagnosis based on AC transformer can not be applied simply on the case of AC and DC voltage.关键词
换流变压器/油纸绝缘内部气隙缺陷/交直流叠加电压/局部放电/发展过程/严重程度Key words
converter transformer/internal gas-gap defect in oil-paper insulation/AC and DC/partial discharge/development/fault diagnosis分类
信息技术与安全科学引用本文复制引用
齐波,魏振,李成榕,张晓涵,于淼,左健..交直流叠加电压作用下油纸绝缘内部气隙放电发展过程[J].中国电机工程学报,2014,(36):6554-6561,8.基金项目
国家自然科学基金项目(51477052))；国家电网公司科技项目资助(EPRIGYKJ(2013)2441)。Project Supported by National Natural Science Foundation of China (51477052) （51477052）
Project Supported by State Grid Corporation of Science and Technology Project(EPRIGYKJ(2013)2441) （EPRIGYKJ(2013）
