交流电压下油纸绝缘放电发展过程中电-磁-声特征参量的变化规律  

Variation of Electrical-magnetic-acoustic Characteristic Parameters During the Development of Oil-pressboard Insulation Discharge Under AC Voltage

作　　者：江长明 黄猛 郝震[3] 李雨[3] 刘健 马鑫晟[3] JIANG Changming;HUANG Meng;HAO Zhen;LI Yu;LIU Jian;MA Xinsheng(North China Branch of State Grid Corporation of China,Beijing 100053,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;North China Elec-tric Power Research Institute Co.,Ltd.,Beijing 100045,China)

机构地区：[1]国家电网有限公司华北分部,北京100053 [2]华北电力大学新能源电力系统全国重点实验室,北京102206 [3]华北电力科学研究院有限责任公司,北京100045

出　　处：《高电压技术》2024年第8期3805-3813,共9页High Voltage Engineering

摘　　要：沿面放电是变压器油纸绝缘结构最严重的放电故障类型之一。为了准确获取交流电压下油纸绝缘沿面放电发展过程中特征参量的变化规律,搭建了沿面放电发展过程模拟试验平台并建立了1套能够满足对放电发展过程中电、磁、声这3种物理量同步在线监测需求的测量系统。在此基础上,提取沿面放电发展过程中多物理参量的典型特征,通过对特征参量全过程幅值变化规律的分析对放电过程进行阶段划分,并给出相应的阶段特征及机理概述。试验结果表明,通过分析多参量典型特征及变化规律可以将沿面放电发展过程划分为4个阶段:微小能量放电阶段、低能量放电阶段、高能量放电阶段、临近击穿阶段,阶段特征与电荷分布及绝缘材料耐受强度有关。相比常规单参量监测手段,多参量同步检测方法为变压器沿面故障诊断和及时预警提供了更可靠准确的参考依据。Surface discharge is one of the most serious types of discharge faults in transformer oil-pressboard insulation structures.In order to accurately obtain the changes in characteristic parameters during the development process of oil-pressboard insulation surface discharge under AC voltage,a simulation experimental platform for the development process of surface discharge was built and a measurement system which can meet the synchronous online monitoring re-quirements of electrical,magnetic,and acoustic physical quantities during the discharge development process was established in this paper.On this basis,typical features of multiple physical parameters during the development of surface discharge were extracted;moreover,by analyzing the amplitude changes of characteristic parameters throughout the entire process,the discharge process was divided into stages,and corresponding stage characteristics and mechanism overview were provided.The experimental results indicate that,by means of analyzing the typical characteristics and variation pat-terns of multiple parameters,the development process of surface discharge can be divided into four stages,namely,micro energy discharge stage,low energy discharge stage,high energy discharge stage,and near breakdown stage,and the stage characteristics are related to charge distribution and insulation material resistance strength.Compared to conventional single parameter monitoring methods,a more reliable and accurate reference evidence for transformer surface discharge fault diagnosis and timely warning is provided by the multi-parameter synchronous detection method.

关 键 词：变压器 油纸绝缘 沿面放电 多参量信号 变化规律 阶段划分 

分 类 号：TM855[电气工程—高电压与绝缘技术]