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Energies 2018, 11(1), 146; doi:10.3390/en11010146

Effectiveness Analysis and Temperature Effect Mechanism on Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters Obtained from PDC Data

1,2,†
,
1,3,†,* , 1,4,†,* , 3, 3, 3 and 3
1
Guangxi Key Laboratory of Power System Optimization and Energy Technology, Guangxi University, Nanning 530004, Guangxi, China
2
State Grid Henan Electric Power Research Institute, Zhengzhou 450052, Henan, China
3
Shijiazhuang Power Supply Branch of State Grid Electric Power Company, Shijiazhuang 050000, Hebei, China
4
National Demonstration Center for Experimental Electrical Engineering Education, Guangxi University, Nanning 530004, Guangxi, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 8 December 2017 / Revised: 26 December 2017 / Accepted: 31 December 2017 / Published: 8 January 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

The dielectric monitoring/diagnostic tool, such as Polarization and Depolarization Current (PDC) measurement, is now being widely applied to obtain the status of deteriorated transformers around the world. Nowadays, several works have reported that the chemical and electrical-based transformer insulation diagnostic parameters (absorption ratio, polarization index, paper conductivity, oil conductivity, insulation resistance, etc.) can be easily calculated from the PDC data. It is a fact that before using these parameters to obtain the status of deteriorated transformers, the power engineers should prudently investigate the effectiveness of these parameters. However, there are few papers that investigate the important issue. In addition, the understanding of temperature effect mechanism on these parameters should also be prudently studied. In the present work, we firstly prepare several oil-impregnated pressboard specimens with various insulation statuses by using a sequence of thermal ageing and moisture absorption experiments launched in the laboratory, and then the PDC measurement is performed to obtain the chemical and electrical-based transformer insulation diagnostic parameters. Finally, we systematically interpret the effectiveness and temperature effect mechanism on these chemical and electrical-based transformer insulation diagnostic parameters. View Full-Text
Keywords: dielectric monitoring/diagnostic tool; polarization and depolarization current (PDC); transformer; chemical and electrical-based transformer insulation diagnostic parameters; effectiveness; temperature effect mechanism dielectric monitoring/diagnostic tool; polarization and depolarization current (PDC); transformer; chemical and electrical-based transformer insulation diagnostic parameters; effectiveness; temperature effect mechanism
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Zheng, H.; Liu, J.; Zhang, Y.; Ma, Y.; Shen, Y.; Zhen, X.; Chen, Z. Effectiveness Analysis and Temperature Effect Mechanism on Chemical and Electrical-Based Transformer Insulation Diagnostic Parameters Obtained from PDC Data. Energies 2018, 11, 146.

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