摘要
交直流复合电压下油纸绝缘局放发展阶段的划分与识别是换流变压器绝缘故障诊断的基础。文中研究了1：1交直流复合电压下油纸绝缘针板电极模型的局放特性与雷达谱图特性。基于模糊聚类分析,运用6个局放特征量（最大视在放电量、平均视在放电量、放电重复率、放电最大时间间隔、局放脉冲等效时间及等效频率）将放电发展过程划分为5个阶段,并对每个阶段进行了物理描述,发现放电阶段与绝缘状态和放电形式有关。根据6个放电特征量建立的局放雷达谱图在不同放电阶段呈现不同的形状,雷达谱图的重心坐标比与长宽比作为谱图形状的量化特征量,可在其二维特征域内有效区分不同的局放阶段。最后基于雷达谱图形状特征,运用粒子群优化的最小二乘支持向量机,设计了油纸绝缘针板模型局放发展阶段识别器,其识别率达92.9%。
Partition and recognition of the partial discharge （PD） development stages in oil-pressboard insulation at AC-DC mixed voltage are the bases for analysis of insulation faults in converter transformers. In this paper, different characteristic parameters and radar maps of PD activity in the oil-pressboard insulation with needle-plate model at 1：1 AC-DC mixed voltage was investigated. Based on hierarchical cluster analysis with six feature parameter~ including maximum amplitude of apparent charge in pC, average amplitude of apparent charge in pC, PD repetition rate, maximum PD interval, pulse equivalent time and pulse equivalent frequency, the PD development process can be divided into five stages, the physical description of PD stage partition is also discussed, it is found that the PD stages are related to the insulation states and discharge modes. The radar maps with the six feature parameters have different shapes in different PD stages. The barycenter-coordinate ratio and depth-width ratio, which are the quantitative features of the radar map shapes, can distinguish different PD stages in their 2-D feature domain. Finally, based on the shape features of radar maps, a recognizer for PD stages is designed using the least square support vector machine optimized by particle swarm optimization, its recognition rate is 92.9%.
作者
李斯盟
李清泉
刘洪顺
姚竣严
赵永志
韩克俊
LI Simeng;LI Qingquan;LIU Hongshun;YAO Junyan;ZHAO Yongzhi;HAN Kejun(Shandong University）,Jinan 250061,Shandong Province,China;Shandong Power Equipment Co.Ltd.,Jinan 250022,Shandong Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2018年第19期5897-5908,共12页
Proceedings of the CSEE
基金
国家自然科学基金项目(51777117)~~
关键词
交直流复合电场
针板模型
油纸绝缘
局部放电
雷达谱图
AC-DC mixed voltage
needle-plat electrodes
oil-paper insulation
partial discharge
radar map
