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

Guoqiang Xia, Guangning Wu, Bo Gao, Haojie Yin and Feibao Yang
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Guoqiang Xia: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Guangning Wu: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Bo Gao: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Haojie Yin: School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
Feibao Yang: Energy China HEPDI, Changsha 410007, China

Energies, 2017, vol. 10, issue 8, 1-15

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 10 1 ~10 3 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. S m , which represents the integral value from 10 ?1 to 10 ?3 Hz, and S DP , which represents the integral value from 10 1 to 10 3 Hz, were extracted as characteristic parameters of moisture content and aging degree respectively. Compensation factors ? which represents the influence ratio of moisture on S DP and ? which represents the influence ratio of aging on S m 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.

Keywords: aging degree; characteristic parameters; compensation factor; frequency domain spectroscopy; moisture content; oil-paper insulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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