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Energies 2017, 10(8), 1195; doi:10.3390/en10081195

A New Method for Evaluating Moisture Content and Aging Degree of Transformer Oil-Paper Insulation Based on Frequency Domain Spectroscopy

1
School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
Energy China HEPDI, Changsha 410007, China
*
Author to whom correspondence should be addressed.
Received: 3 April 2017 / Revised: 29 July 2017 / Accepted: 8 August 2017 / Published: 12 August 2017
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Abstract

The condition of oil-paper insulation is closely related to the life expectancy of a transformer. The accurate results of oil-paper have not been obtained due to the impact of influencing factors. Therefore, in order to improve the evaluation accuracy of oil-paper insulation, in this paper, oil-paper samples which were prepared with different aging and moisture content were analyzed by frequency domain spectroscopy (FDS). Results show that when the moisture content is less than 2%, the range of 101~103 Hz is mainly affected by moisture and aging has little effect. However, with the increase of moisture content, the effect of aging degree on this band became increasingly prominent. Sm, which represents the integral value from 10−1 to 10−3 Hz, and SDP, which represents the integral value from 101 to 103 Hz, were extracted as characteristic parameters of moisture content and aging degree respectively. Compensation factors γ which represents the influence ratio of moisture on SDP and φ which represents the influence ratio of aging on Sm were introduced to compensate for the influence of moisture content and aging degree on characteristics respectively. Then, a new method was proposed to evaluate the condition of oil-paper based on compensation factors. Through this method, the influence in characteristics can be eliminated by the obtained actual compensation factors, thus distinguishing the internal influence between moisture content and aging degree on FDS. Finally, this method was verified by field test. View Full-Text
Keywords: aging degree; characteristic parameters; compensation factor; frequency domain spectroscopy; moisture content; oil-paper insulation aging degree; characteristic parameters; compensation factor; frequency domain spectroscopy; moisture content; oil-paper insulation
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Xia, G.; Wu, G.; Gao, B.; Yin, H.; Yang, F. A New Method for Evaluating Moisture Content and Aging Degree of Transformer Oil-Paper Insulation Based on Frequency Domain Spectroscopy. Energies 2017, 10, 1195.

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