An Analysis of the Characteristics of Oil-Paper Insulated Bushing with Moisture and X-wax Defects Through Oil Chromatographic and Frequency Domain Spectroscopy

Yubo Zhang, Zhiming Huang, R. Zhuo, M. Fu, Zhangting Yu, Lei Zhang, Yan Luo, Yue Yu
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Abstract

This paper presents an investigation on the characteristics of damping and X-wax defects of oil-paper insulated bushing, with a combination of oil chromatograph and Frequency Domain Spectroscopy (FDS) and disintegration analysis. Firstly, based on the disintegration analysis and oil chromatography analysis of five 500 kV bushings with different service periods, the difference of dissolved gas component content in the bushing oil were obtained and were related to damping and X-wax defects. The results show that in the bushing suffering X-wax defect the oil contains a large amount of hydrogen (over $10000\ \mu\mathrm{L}/\mathrm{L}$) and methane, and that shall be acted as a significant characteristic of the X-wax defect. Nevertheless, the content of carbon dioxide (CO2), acetylene (C2H2), ethylene (C2H4) and moisture in the oil of the bushing suffering damping defect is clearly higher than that in the defective bushings with X-wax. Secondly, the frequency domain dielectric spectrum (FDS) analysis of 5 bushings in service and 1 new bushing was conducted. It shows that the FDS is sensitive to moisture and x-wax defects of the bushings. In addition, the moisture mainly affects the dielectric loss of low frequency band (1mHz∼10mHz) of FDS curves. The X-wax defect has little effect on the low frequency band (1mHz∼10mHz) of FDS curves, but mainly affects the dielectric loss of 0.1Hz∼10Hz frequency band of FDS curves.
用油色谱和频域光谱分析含水分和x蜡缺陷的油纸绝缘套管的特性
本文采用油色谱仪、频域光谱(FDS)和解体分析相结合的方法,对油纸绝缘套管的阻尼和x蜡缺陷特性进行了研究。首先,通过对5个不同服役年限的500kv套管的解体分析和油层析分析,得出了套管油中溶解气体组分含量的差异,并与阻尼和x -蜡缺陷有关。结果表明,在x -蜡缺陷衬套中,油中含有大量氢气(超过$10000\ \mu\ mathm {L}/\ mathm {L}$)和甲烷,这是x -蜡缺陷的显著特征。然而,阻尼缺陷衬套油中二氧化碳(CO2)、乙炔(C2H2)、乙烯(C2H4)和水分的含量明显高于含有x -蜡的缺陷衬套。其次,对5个在役衬套和1个新衬套进行了频域介电谱分析。结果表明,FDS对轴套的湿气缺陷和x蜡缺陷非常敏感。此外,水分主要影响FDS曲线低频段(1mHz ~ 10mHz)的介电损耗。x -蜡缺陷对FDS曲线低频段(1mHz ~ 10mHz)影响不大,但主要影响FDS曲线0.1Hz ~ 10Hz频段的介电损耗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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