Experimental Discharge Initiation Study for Paper and Pressboard Insulated Electrodes in Mineral Oil and Synthetic Ester Fluid

Ester insulating fluids have different properties compared to commonly used mineral oils and for application in power transformers adequate design rules are needed. For dielectric design, parameters describing discharge initiation, propagation and breakdowns are relevant and need to be quantified. S...

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Bibliographic Details
Published in2019 IEEE 20th International Conference on Dielectric Liquids (ICDL) pp. 1 - 5
Main Authors Vukovic, Dejan, Milone, Marco, Hjortstam, Olof, Faleke, Hakan
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.06.2019
Subjects
discharge initiation
oil wedge
paper covered electrode
power transformer
synthetic ester
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Summary:Ester insulating fluids have different properties compared to commonly used mineral oils and for application in power transformers adequate design rules are needed. For dielectric design, parameters describing discharge initiation, propagation and breakdowns are relevant and need to be quantified. Some of them are defined and measured within this study. The discharge initiation lightning impulse voltages are measured for two test object types reflecting typical geometries of power transformers construction (oil gap and oil wedge configuration) and for two fluid types (mineral oil and synthetic ester). Furthermore, the discharge delay time is evaluated as well as the nature of discharge propagation.
ISSN:2153-3733
DOI:10.1109/ICDL.2019.8796610