Investigation of moisture influence on dielectric response of ester oil impregnated pressboard

Bandara, Kapila, Ekanayake, Chandima, Saha, Tapan and Ma, Hui (2015). Investigation of moisture influence on dielectric response of ester oil impregnated pressboard. In: 2015 IEEE Power and Energy Society General Meeting. Power and Energy Society General Meeting, Denver, CO, United States, (). 26-30 July 2015. doi:10.1109/PESGM.2015.7286020


Author Bandara, Kapila
Ekanayake, Chandima
Saha, Tapan
Ma, Hui
Title of paper Investigation of moisture influence on dielectric response of ester oil impregnated pressboard
Conference name Power and Energy Society General Meeting
Conference location Denver, CO, United States
Conference dates 26-30 July 2015
Convener IEEE
Proceedings title 2015 IEEE Power and Energy Society General Meeting
Journal name IEEE Power and Energy Society General Meeting
Series IEEE Power and Energy Society General Meeting
Place of Publication Piscataway, NJ, United States
Publisher IEEE (Institute for Electrical and Electronic Engineers)
Publication Year 2015
Sub-type Fully published paper
DOI 10.1109/PESGM.2015.7286020
Open Access Status Not Open Access
ISBN 9781467380409
ISSN 1944-9933
Volume 2015-September
Total pages 5
Collection year 2016
Language eng
Abstract/Summary Demand for alternative insulating liquids for power transformers are increasing due to the safety and environment concerns. Ester based insulating liquid is considered as a potential alternative for mineral oil since it is highly biodegradable and has high fire point. On the other hand, Polarization and Depolarization Current (PDC) measurement technique has been widely used to evaluate moisture and ageing condition of transformer's insulation system. However, there is limited experience of using PDC measurement for ester liquid filled power transformers. This paper investigates dielectric response of four types of insulating liquids impregnated pressboard specimens under varying moisture and temperature conditions. The PDC measurement results of esters and mineral oil impregnated pressboards at approximately same moisture levels are compared in the paper. Moreover, this paper adopts an equivalent circuit for interpreting the PDC response of the pressboard specimens. The variations of the parameters of the equivalent circuit under different moisture levels are also discussed in the paper.
Keyword Ageing
Conductivity
Insulating liquid
Moisture
Natural ester
Polarization and Depolarization current (PDC)
Pressboard
Synthetic ester
Transformer
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

 
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