Electrical, physical, and chemical performance of transformer's oil, paper insulation, and gasket retrofilled with synthetic ester oil"

Mat Hussin, Muhammed Hairie (2024) Electrical, physical, and chemical performance of transformer's oil, paper insulation, and gasket retrofilled with synthetic ester oil". Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Retrofilling is a method involving a replacement of aged mineral oil with new insulating oil as the insulating material in transformers. Despite thorough flushing with new oil during the retrofilling process, contamination from the old oil persists. This contamination can lead to the degradation of insulating materials such as insulating paper, pressboard, and gaskets. Over a long period, this degradation can change the properties of the insulating material into a semi-conductor. The transformer's lifespan is assessed based on the performance of the insulation system, including insulating oil and paper insulation oil. Therefore, this research aims to investigate the electrical, physical, and chemical performances of the transformer's oil, paper insulation, and gaskets after the retrofilling process with ester oil. Nynas Nytro Libra (MO), Midel 7131 (synthetic oil) , kraft paper, pressboard, and gaskets made of nitrile rubber (NBR) will be used as insulating materials. The study will be conducted under two conditions: retrofilling with mineral oil (MO) and retrofilling with synthetic oil (SE). A comparison will be made between these two conditions to assess the effectiveness of the retrofilling process using SE. Transformers oil after retrofilled with MO showed better performance compared to after retrofilled with SE where the dissolved decay product (DDP) values after retrofilled with MO was higher compared to after retrofilled with SE. Retrofilled with MO also shows a better effect on kraft paper compared to retrofilled with SE where the tensile strength is slightly higher. However, the shore hardness of the gasket shows a better performance when retrofilling with SE.

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