基于FDS的变压器油浸纸老化程度与水分含量评估方法

发布时间：2018-06-12 07:18

本文选题：变压器 + 油纸绝缘　；参考：《电力自动化设备》2017年01期

【摘要】：搭建了频域介电谱(FDS)技术测试试验平台,测试了不同老化程度和不同水分含量油浸纸样品的复介电常数,并对测试结果进行对比分析。分析结果表明:绝缘纸聚合度的降低使油浸纸样品的复介电常数实部和虚部在低频段增大,而在高频段基本不变;绝缘纸水分含量的增加使油浸纸样品的复介电常数实部在10~2 Hz以下的频域范围内增大,虚部在整个测试频域范围内增大,且虚部曲线随水分含量的增大呈现向右平移趋势。提出利用复介电常数虚部的等效下降幅度作为绝缘纸聚合度映射特征量,以此评估油浸纸的老化状态。拟合出特征频率10~(-4) Hz处复介电常数实部与水分含量的关系式,以此提出一种适用于不同老化程度和油浸纸水分含量的频域介电特征量评估方法。
[Abstract]:A frequency domain dielectric spectrum spectroscopy (FDS) technique was set up to test the complex dielectric constant of oil-impregnated paper samples with different aging degree and moisture content, and the test results were compared and analyzed. The results show that the decrease of polymerization degree of insulator paper increases the real and imaginary parts of the complex dielectric constant of the oil-impregnated paper sample in the low frequency range, but basically does not change in the high frequency band. The increase of moisture content of insulator paper increases the real part of complex permittivity of oil-impregnated paper in the frequency domain below 102Hz, and the imaginary part increases in the whole testing frequency domain, and the imaginary part curve tends to shift to the right with the increase of moisture content. The equivalent drop amplitude of the imaginary part of the complex dielectric constant is used as the characteristic quantity of the polymerization degree mapping of the insulator paper to evaluate the aging state of the oil-impregnated paper. The relationship between the real part of complex dielectric constant and water content at 10Hz is fitted, and a method for evaluating dielectric characteristic in frequency domain is proposed, which is suitable for different aging degree and moisture content of oil-impregnated paper.
【作者单位】：西南交通大学电气工程学院;
【分类号】：TM855

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