NDLI: Effect of moisture on dielectric properties of oil-paper insulation at low temperature

Content Provider	IEEE Xplore Digital Library
Author	Guo Wenmin Liu Dan
Copyright Year	2015
Description	Author affiliation: Key Lab. of Eng. Dielectr. & Its Applic., Harbin Univ. of Sci. & Technol., Harbin, China (Guo Wenmin; Liu Dan)
Abstract	Oil-paper insulation is main insulation type for HV, EHV and UHV large transformer. The operation reliability of transformers is largely determined by dielectric properties of oil-paper insulation. At present, research on dielectric properties of oil-paper insulation is mostly carried out based on room temperature and high temperature, and the dielectric properties of oil-paper insulation at low temperature is not clear. Therefore, AC dielectric properties of oil and oil-paper insulation at low temperature were researched through experiments in this paper. The results show that relative dielectric constant of oil and composite increases with decrease of temperature, but the trend of loss factor is different. The loss factor of oil presents the trend of first increase then decrease with the decrease of temperature, and the composites presents opposite trend, and the extreme point of loss factor moves to high temperature with the increase of initial moisture content. It is found that dielectric properties of oil and oil-paper change with spatial location. These phenomena are related with the moisture content of oil-paper insulation. With decreasing temperature, the water dissolved in oil is precipitating from oil and forming the microscopic droplets of water. The droplets of water play the important role to the dielectric properties of oil-paper insulation.
Starting Page	164
Ending Page	167
File Size	737856
Page Count	4
File Format	PDF
ISSN	21609241
e-ISBN	9781479989034
DOI	10.1109/ICPADM.2015.7295234
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-07-19
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature Moisture Oil insulation Power transformer insulation Dielectric constant dielectric properties oil-paper insulation low temperature moisture
Content Type	Text
Resource Type	Article

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