Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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极化/去极化电流测试系统的设计及应用

来源:电工电气发布时间:2017-10-19 11:19 浏览次数:7
极化/去极化电流测试系统的设计及应用
 
孙长海1,尚京城1,薛静梅2,彭娜2,王兵3
(1 大连理工大学 电气工程学院,辽宁 大连 116024;2 特变电工沈阳变压器集团有限公司,辽宁 沈阳 110144;
3 国网吉林省电力有限公司检修公司,吉林 长春 130022)
 
    摘 要:极化/ 去极化电流(PDC) 介电响应法是一种变压器油纸绝缘无损检测及寿命评估方法。以“特高压直流接入750 kV 交流换流变压器研制”课题为背景,设计了一套极化/ 去极化电流测试系统,包含高压模块、开关模块、采集模块及终显模块的设计及选型。该法依据油纸绝缘的极化特性,测得极化/ 去极化电流,依托极化/ 去极化电流曲线的演变机制,评价变压器油纸绝缘劣化程度及寿命,从而综合诊断变压器的服役状态。
    关键词:油纸绝缘;极化电流;去极化电流;测试系统;诊断评价
    中图分类号:TM855     文献标识码:A     文章编号:1007-3175(2017)10-0038-06
 
Design and Application of Polarization / Depolarization Current Measurement System
 
SUN Chang-hai1, SHANG Jing-cheng1, XUE Jing-mei2, PENG Na2, WANG Bing3
(1 School of Electrical Engineering, Dalian University of Technology, Dalian 116 024, China;
2 TBEA Shenyang Transformer Group Co., Ltd, Shenyang 11 0144, China;
3 State Grid Jilisheng Electric Power Supply Company Maintenance Company, Changchun 130022, China)
 
    Abstract: The polarization and depolarization current (PDC) dielectric response is a kind of non-destructive testing and life assessment method for transformer paper oil insulation. Based on the background of major projects “ the development of ultra high voltage direct current (UHVDC) access 750 kV AC converter transformer”, this paper designed a set of polarization and depolarization current measurement system, including the design and type selection of high voltage power supplying and controlling module, switch controlling module, data acquisition module, and displaying module. According to the polarization properties of paper oil insulation, the polarization current and depolarization current were measured to evaluate the deterioration degree and lifetime of transformer paper oil insulation depending on the evolvement mechanism of the polarization and depolarization current curve, so as to comprehensively diagnosis the service status of transformers.
    Key words: paper oil insulation; polarization current; depolarization current; test system; diagnostic evaluation
 
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