Title: Effect of headspace air conditions on total organic acids dissolved in transformer oil

Authors: Kobra Pourabdollah

Addresses: Chemistry and Chemical Engineering Research Center of Iran, Department of Petroleum Engineering, P.O. Box 1497716343, Tehran, Iran

Abstract: The aim of this work was studying the effect of dissolved oxygen concentration, temperature and humidity level of headspace air on the acidification of insulation oil. The novelty is assessment and classification of those parameters based on the acidity level, induction time and the rate of oil acidifying. Two gas-washers containing insulation oil and deionised water were in contact with the bubbling streams of O₂/N₂ containing different humidity levels. The acidity of two phases was determined based on TAN number and pH values, respectively. The results revealed that O₂/N₂ weight ratio, insulator temperature and the level of air humidity control the acidity strength, the induction time of acid production and the rate of oil acidifying, respectively. Reduction of O₂/N₂ weight ratio in the headspace air decreased the level of the produced organic acids, while reduction of temperature extended the onset time of acid formation. [Received: July 31, 2020; Accepted: January 12, 2021]

Keywords: dissolved gas analysis; DGA; oxidation; organic acid; insulation oil; humidity.

DOI: 10.1504/IJOGCT.2022.121052

International Journal of Oil, Gas and Coal Technology, 2022 Vol.29 No.3, pp.241 - 257

Received: 30 Jul 2020
Accepted: 12 Jan 2021
Published online: 23 Feb 2022 *

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