引用本文: | 林燕桢,蔡金锭.回复电压极化谱特征量与油纸绝缘变压器微水含量关系分析[J].电力系统保护与控制,2014,42(5):148-153.[点击复制] |
LIN Yan-zhen,CAI Jin-ding.Analysis of the relationship between the characteristics of the return voltage polarization spectrum and micro water content of oil-paper insulation transformer[J].Power System Protection and Control,2014,42(5):148-153[点击复制] |
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摘要: |
水分是强极性分子,会改变绝缘介质的弛豫时间,从而影响变压器的绝缘状态。因此准确诊断变压器中的微水含量,对分析变压器的老化受潮状态具有重要意义。通过介质响应的回复电压法,结合现场测试的回复电压极化谱特征量进一步探讨了回复电压极化谱的特征量与油纸绝缘变压器微水含量之间的内在联系,得出结论:主时间常数越小,则变压器的含水量越高;初始斜率越大,则变压器的含水量越高;同时回复电压最大值也会随着水分含量的增加而增大。因此,可通过分析对比回复电压极化谱特征量来诊断变压器的微水含量,从而更有效地评估油纸绝缘变压器的老化受 |
关键词: 油纸绝缘 微水含量 回复电压 极化谱特征量 变压器 |
DOI:10.7667/j.issn.1674-3415.2014.05.024 |
投稿时间:2013-06-06修订日期:2013-07-20 |
基金项目:国家自然科学基金(61174117) |
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Analysis of the relationship between the characteristics of the return voltage polarization spectrum and micro water content of oil-paper insulation transformer |
LIN Yan-zhen,CAI Jin-ding |
(College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108, China) |
Abstract: |
Moisture is a strong polar molecule, and it could change the relaxation time of dielectric and accordingly affect the state of transformer insulation. So it is of great significance to analyze the transformer’s aging and damp condition with the method of diagnosing the micro water content of the transformer accurately. By applying the dielectric response return voltage method, combining with the characteristics of the return voltage polarization spectrum by field test to discuss the relationship between the micro water content and the characteristics of the return voltage polarization spectrum further, we have come up with an conclusion that the smaller the dominant time constant is, the more water the transformer contains; the larger the initial slope is, the more water the transformer contains. At the same time, with the increase of water content in the transformer the maximum value of return voltage will also be increased. So we can diagnose the micro water content of the transformer by analyzing the characteristics of the return voltage polarization spectrum, so as to assess the aging and damp state of oil-paper insulation transformer effectively. |
Key words: oil-paper insulation micro water content return voltage characteristics of the polarization spectrum transformer |