Water Content Influence on Physio-Chemical Properties of a Transformer Naphtenic Oil

H. Moulai, A. Nacer, I. Khelfane, and A. Debche (Algeria)

Keywords

Transformer oil – Physicochemical properties – water

Abstract

This work is devoted to study the influence of water content on the physico-chemical properties of a naphtenic mineral oil used in MV and HV power transformers. The investigated parameters are breakdown voltage, relative permittivity εr, dissipation factor (Tanδ) and resistivity. Three samples of oil are considered: The first one is a non treated new oil while the second is taken from a one year normal operating transformer and the third is extracted from a 15 years old operating transformer.

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