干式空心电抗器匝间绝缘缺陷诊断试验及其解体分析  

Diagnostic Test and its Disassembly Analysis on Inter-turn Insulation Defects of Dry-type Air-core Reactor

作　　者：王琼[1] 辛力坚[1] 张冬 王振中 杨波[1] 车传强[1] WANG Qiong;XIN Lijian;ZHANG Dong;WANG Zhenzhong;YANG Bo;CHE Chuanqiang(Inner Mongolia Electric Power Science ＆ Research Institute, Hohhot 010020, China;Inner Mongolia EHV Power Transmission Company, Hohhot 010080, China)

机构地区：[1]内蒙古电力科学研究院,内蒙古呼和浩特010020 [2]内蒙古超高压供电局,内蒙古呼和浩特010080

出　　处：《电力电容器与无功补偿》2017年第6期64-69,共6页Power Capacitor & Reactive Power Compensation

基　　金：内蒙古电力(集团)有限责任公司科技项目(201601032)

摘　　要：匝间短路是引发干式空心电抗器起火事故的主要原因。针对疑似匝间绝缘缺陷的干式空心电抗器,本文采用层层推进的试验方式,利用匝间过电压和温升试验、各包封直流电阻和损耗测试及拆解缺陷的方式,逐步确定了匝间绝缘缺陷的位置。结合缺陷位置绝缘介质受损严重程度及其形貌特性,探究了匝间绝缘缺陷试验的灵敏度,并提出了试验建议。研究表明:匝间过电压试验和温升试验检测干式空心电抗器匝间绝缘缺陷的灵敏度很高,其精度在0.1%之内。应当充分重视匝间过电压试验首次试验结果,以免发生误判。若电磁线引出线与星臂连接实现现场拆装,则匝间绝缘缺陷的现场检出率便可大大提高。Inter-turn short circuit is the main cause of fire accident of dry-type air-core reactor. As tor the dry-type air core reactor with suspected inter-turn insulation defect, in this paper, the on-push test method is used to define gradually position of the inter-turn insulation by the use of inter-turn over voltage and temperature rise test, of DC resistance and loss test of each reactor encapsulation as well as dismantling defects. Moreover, the sensitivity of inter-turn insulation defect test is studied with the combination of the damage severity of the insulation medium at the defect position and its topographic features and test suggestion is proposed. It is shown by the study that the test of both inter-turn over voltage and temperature rise have high sensitivity in detecting the inter-turn insulation defects of dry type air-core reactor and the accuracy is within 0.1%. It is necessary to pay more attention to the first-time test result of inter turn overvoltage test so to avoid misjudgment. If the connection between the output wire of electromagnetic lead and connecting parts between wire leads and reactor assembly arms can be disassembled at site, then the site detection rate of the inter-turn insulation defect can be improved significantly.

关 键 词：干式空心电抗器 包封 匝间绝缘缺陷 诊断试验 解体分析 耐热等级 测量精度 

分 类 号：TM47[电气工程—电器]