电力变压器油纸绝缘含水量定量评估的时域介电特征量

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摘要水分是影响变压器油纸绝缘性能的一个重要因素。为了评估变压器主绝缘中的含水量,从而对变压器的绝缘状态及剩余寿命进行可靠预测,本文利用时域介电响应技术的极化/去极化电流法（Polarization and Depolarization Current, PDC）对变压器油纸绝缘含水量进行了深入研究。首先,在实验室内制备了不同含水量的油浸渍绝缘纸板样品,然后,利用Matlab程序仿真了样品的实测PDC图谱并获取了扩展Debye模型参数。最后,提出了两个能够量化油浸渍绝缘纸板油纸绝缘含水量的新特征量——极化电量斜率K_p与稳定极化电量Q_p-5000。分析结果表明：特征量K_p与Q_p-5000对纸板样品的含水量变化非常敏感。该特征量与纸板含水量存在指数函数关系。因此,K_p和Q_p-5000可以用于变压器油纸绝缘含水量的定量评估。

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关键词 ：电力变压器, 油纸绝缘, 极化/去极化电流法, 扩展Debye模型, 极化电量斜率, 稳定极化电量

Abstract：Moisture is an important factor which can degrade the property of transformer oil-paper insulation. To predict the moisture content in transformer main insulation system, and thus effectively forecast its insulation condition and remaining life, in this paper, the moisture content presented in oil-paper insulation was investigated in detail by using polarization and depolarization current(PDC) technique. Firstly, several oil-impregnated pressboards with different moisture contents are prepared in laboratory conditions, and then the PDC results on oil-impregnated pressboards was simulated by using Matlab software to obtain the parameters of extended Debye model. Finally, two time domain dielectric characteristics—polarization charge quantity slope(K_p) and stable polarization charge quantity(Q_p-5000) which can predict the moisture content in oil-impregnated pressboards are proposed. Results show that K_p and Q_p-5000 are very sensitive to moisture content in pressboards. There are the exponential relations between K_p & Q_p-5000 and moisture content in pressboards, therefore, K_p & Q_p-5000 can be used to quantitatively assess the moisture content in transformer oil-paper insulation.

Key words： Power transformer oil-paper insulation polarization and depolarization current(PDC) extended Debye model polarization charge quantity slope stable polarization charge quantity

收稿日期: 2013-08-23 出版日期: 2015-04-14

PACS:

TM855

基金资助:国家自然科学基金资助项目（51277187）

作者简介: 刘捷丰男,1985年生,博士研究生,研究方向为大型油浸式电力变压器绝缘状态评估与寿命预测。廖瑞金男,1963年生,教授,博士生导师,研究方向为电气设备绝缘在线监测与故障诊断。

引用本文:

刘捷丰,廖瑞金,吕彦冬,杨丽君,高竣,张镱议. 电力变压器油纸绝缘含水量定量评估的时域介电特征量[J]. 电工技术学报, 2015, 30(2): 196-203. Liu Jiefeng,Liao Ruijin,Lü Yandong,Yang Lijun,Gao Jun,Zhang Yiyi. Time Domain Dielectric Characteristics for Quantitative Assessment of Moisture Content in Transformer Oil-Paper Insulation. Transactions of China Electrotechnical Society, 2015, 30(2): 196-203.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I2/196

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