Morphological study on corrosive sulphur development in transformer windings

A.M., Selva and N., Azis and M.Z.A., Ab Kadir and J., Jasni and M.F., M Yousof and Zainuddin, Hidayat (2024) Morphological study on corrosive sulphur development in transformer windings. In: 2024 IEEE 4th International Conference in Power Engineering Applications (ICPEA), 4 March 2024 through 17 March 2024, Pulau Pinang, Malaysia.

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Abstract

This study presents morphological study on transformer windings with the presents of corrosive sulphur. The thermal ageing experiment was conducted at 150∘C for 5 days. The mineral oil and Kraft paper's moisture content post drying were maintained less than 30 ppm and 0.5%, respectively. Several analyses were carried out such as Scanning Electron Microscopy (SEM), Energy dispersive X-ray (EDX) and AC breakdown voltage to understand the influence and the formation mechanism of copper sulphide (Cu2 S) deposits on copper strip, the deterioration mechanism of Cu2 S on Kraft paper and oil. The presence of Cu2 S changes the color appearance of oil to yellowish. The copper strip and Kraft paper have noticeable grey-black deposits on the surface upon unwrapping the paper from copper strip. The SEM results reveals that the Cu2 S deposits alter the surface structure of copper strip with numerous granular sediments present on the copper surface. The fibre texture of Kraft paper on the mid (5th ) layer becomes fuzzy and worst on the 1st layer. The actual dielectric breakdown strength of corrosive oil reduces close to half as compared to non-corrosive oil.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Sulphur, Transformer, Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX)
Divisions:	Faculty of Electrical Engineering
Depositing User:	NUR FARISAH JAFRIN
Date Deposited:	15 Jun 2026 04:43
Last Modified:	15 Jun 2026 04:43
URI:	http://eprints.utem.edu.my/id/eprint/29725
Statistic Details:	View Download Statistic

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