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Polymers 2018, 10(2), 191; https://doi.org/10.3390/polym10020191

Comparative Investigation on the Performance of Modified System Poles and Traditional System Poles Obtained from PDC Data for Diagnosing the Ageing Condition of Transformer Polymer Insulation Materials

1,2,†
,
1,3,†,* , 1,4,†,* , 5
,
2
,
2
,
2
and
2
1
Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, Guangxi, China
2
Shijiazhuang Power Supply Branch of State Grid Electric Power Company, Shijiazhuang 050000, Hebei, China
3
State Grid Henan Electric Power Research Institute, Zhengzhou 450052, Henan, China
4
National Demonstration Center for Experimental Electrical Engineering Education, Guangxi University, Nanning 530004, Guangxi, China
5
Electric Power Planning & Engineering Institute, Xicheng District, Beijing 100120, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 8 January 2018 / Revised: 31 January 2018 / Accepted: 12 February 2018 / Published: 14 February 2018
(This article belongs to the Special Issue Polymers for Energy Applications)
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Abstract

The life expectancy of a transformer is largely depended on the service life of transformer polymer insulation materials. Nowadays, several papers have reported that the traditional system poles obtained from polarization and depolarization current (PDC) data can be used to assess the condition of transformer insulation systems. However, the traditional system poles technique only provides limited ageing information for transformer polymer insulation. In this paper, the modified system poles obtained from PDC data are proposed to assess the ageing condition of transformer polymer insulation. The aim of the work is to focus on reporting a comparative investigation on the performance of modified system poles and traditional system poles for assessing the ageing condition of a transformer polymer insulation system. In the present work, a series of experiments have been performed under controlled laboratory conditions. The PDC measurement data, degree of polymerization (DP) and moisture content of the oil-immersed polymer pressboard specimens were carefully monitored. It is observed that, compared to the relationships between traditional system poles and DP values, there are better correlations between the modified system poles and DP values, because the modified system poles can obtain much more ageing information on transformer polymer insulation. Therefore, the modified system poles proposed in the paper are more suitable for the diagnosis of the ageing condition of transformer polymer insulation. View Full-Text
Keywords: polarization and depolarization current (PDC); transformer polymer insulation materials; ageing condition; traditional system poles; modified system poles polarization and depolarization current (PDC); transformer polymer insulation materials; ageing condition; traditional system poles; modified system poles
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Liu, J.; Zheng, H.; Zhang, Y.; Zhou, T.; Zhao, J.; Li, J.; Liu, J.; Li, J. Comparative Investigation on the Performance of Modified System Poles and Traditional System Poles Obtained from PDC Data for Diagnosing the Ageing Condition of Transformer Polymer Insulation Materials. Polymers 2018, 10, 191.

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