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Moisture effects on AC dielectric strength and partial discharge inception voltage in natural monoesters

  • Emeric Tchamdjio Nkouetcha ORCID logo EMAIL logo , Ghislain Mengata Mengounou ORCID logo and Adolphe Moukengue Imano ORCID logo
Published/Copyright: December 31, 2021

Abstract

It is essential to analyse the dielectric performance in a humid environment of insulating liquids of plant origin, considered as alternatives to mineral oil (MO) which is not environmentally friendly. This paper focuses on the effects of different moisture levels on the dielectric strength and partial discharge initiation voltage of two natural monoesters, based on castor oil (CO) and palm kernel oil (PKO), and MO. The different samples were moistened with a glycerol solution, then sealed and stored for 12 days to allow further diffusion of moisture into the samples. Dielectric strength was statistically evaluated from IEC 60156. Partial discharge inception voltage (PDIV) experiment was performed in conformity with a modified IEC 61294 purpose at ambient temperature. Based on the experimental observations, the moisture has different behavior on dielectric strength and PDIV of insulating oils. Monoesters have a better withstand to water contamination than MOs in power transformers.


Corresponding author: Emeric Tchamdjio Nkouetcha, Laboratory of Technologies and Applied Science, University of Douala, P.O. Box 2701, Douala, Cameroon, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-07-29
Accepted: 2021-12-20
Published Online: 2021-12-31

© 2021 Walter de Gruyter GmbH, Berlin/Boston

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