投切过电压累积作用下干式空心电抗器匝间绝缘局部放电特性  

Partial discharge characteristics of interturn insulation of dry-type air core reactor under the accumulative effect of switching overvoltage

作　　者：聂洪岩[1,2] 张潮海[1] 姚远航 顾哲屹 刘晓胜[1] NIE Hong-yan;ZHANGChao-hai;YAO Yuan-hang;GUZhe-yi;LlUXiao-sheng(School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001,China;Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education,Harbin University of Scienceand Technology,Harbin 150080,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001 [2]哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080

出　　处：《电机与控制学报》2018年第9期15-23,共9页Electric Machines and Control

基　　金：国家重点研发计划(2017YFB0902705);国家电网公司科技项目(SGTYHT/16-JS-198)

摘　　要：为研究投切干式空心电抗器过程中产生的指数衰减振荡过电压对匝间绝缘的影响,制作了模拟实际干式空心电抗器匝间绝缘结构的试样模型,搭建了指数衰减振荡过电压试验平台和局部放电测试平台,研究投切过电压累积作用下匝间绝缘局部放电特性参数的变化规律并进行验证性试验。结果表明:投切过电压导致干式空心电抗器匝间绝缘强度大幅下降,应减少投切次数或采取措施限制投切过电压幅值;综合多个局部放电特征参数的变化规律可以表征过电压累积作用导致匝间绝缘老化的程度;过电压作用下发生的局部放电是导致匝间绝缘老化的主要原因之一。通过提高匝间绝缘局部放电起始电压的方法增强绝缘,为电抗器改进制造工艺提供参考。In order to study the effect of exponential decay oscillating overvoltage on the interturn insula-tion in the process of switching the dry-type air core reactor,an experimental model was manufactured to simulate intertum insulation structure of dry-type air core reactor. The test platform under the exponentialdecay oscillating overvoltage and the partial discharge testing platform were establisof the partial discharge characteristic parameters were studied under the accumulation effect of switchingovervoltage and the confirmatory tests were carried out. The test results show that： the age leads to a significant decrease for the interturn insulation strength; the switchiduced or measures should be taken to limit the overvoltage amplitude; the change rules of partial dis-charge characteristic parameters can be considered synthetically to characterize the insulation aging degree caused by the overvoltage; the partial discharge caused by the overvoltage the aging of tlie intertum insulation. The interturn insulation strengtli can be enhanced by improving themanufacturing process to increase the partial discharge initial voltage.

关 键 词：干式空心电抗器 匝间绝缘 局部放电特性 累积作用 

分 类 号：TM855[电气工程—高电压与绝缘技术]