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Energies 2017, 10(11), 1842; https://doi.org/10.3390/en10111842

Study on Quantitative Correlations between the Ageing Condition of Transformer Cellulose Insulation and the Large Time Constant Obtained from the Extended Debye Model

1,2,†
,
1,3,†,* , 1,4,†,* , 1
and
5
1
Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, China
2
National Demonstration Center for Experimental Electrical Engineering Education, Guangxi University, Nanning 530004, China
3
Shijiazhuang Power Supply Branch of State Grid Electric Power Company, Shijiazhuang 050000, China
4
State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China
5
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 19 October 2017 / Revised: 6 November 2017 / Accepted: 7 November 2017 / Published: 11 November 2017
(This article belongs to the Section Electrical Power and Energy System)
Full-Text   |   PDF [5933 KB, uploaded 11 November 2017]   |  

Abstract

Polarization-depolarization current (PDC) measurements are now being used as a diagnosis tool to predict the ageing condition of transformer oil-paper insulation. Unfortunately, it is somewhat difficult to obtain the ageing condition of transformer cellulose insulation using the PDC technique due to the variation in transformer insulation geometry. In this literature, to quantify the ageing condition of transformer cellulose insulation using the PDC technique, we firstly designed a series of experiments under controlled laboratory conditions, and then obtained the branch parameters of an extended Debye model using the technique of curve fitting the PDC data. Finally, the ageing effect and water effect on the parameters of large time constant branches were systematically investigated. In the present paper, it is observed that there is a good exponential correlation between large time constants and degree of polymerization (DP). Therefore, the authors believe that the large time constants may be regard as a sensitive ageing indicator and the nice correlations might be utilized for the quantitative assessment of ageing condition in transformer cellulose insulation in the future due to the geometry independence of large time constants. In addition, it is found that the water in cellulose pressboards has a predominant effect on large time constants. View Full-Text
Keywords: polarization-depolarization current; transformer cellulose insulation; ageing effect; water effect; quantitative correlation; large time constant polarization-depolarization current; transformer cellulose insulation; ageing effect; water effect; quantitative correlation; large time constant
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Zhang, Y.; Liu, J.; Zheng, H.; Wei, H.; Liao, R. Study on Quantitative Correlations between the Ageing Condition of Transformer Cellulose Insulation and the Large Time Constant Obtained from the Extended Debye Model. Energies 2017, 10, 1842.

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