Environmentally friendly power transformer with ester oil

Transformers are one of the most expensive and critical components in electrical power systems.

bythe BEST Transformer team


Transformers are one of the most expensive and critical components in electrical power systems. A failure in a transformer causes economic losses and injuries. It is, therefore, essential to ensure that transformers operate safely throughout their working life. Transformer post-failure analysis shows that insulation failures are the leading cause of transformer failures[1]. Insulation oil and insulation paper are the most well-known insulating materials for transformers. The transformer oil impregnates the gaps in the insulation paper and fills the gaps between the components in the transformer tank to increase the dielectric strength of the insulation. Transformer oil not only acts as an insulating fluid but also conducts heat that is generated in transformer windings and cores.

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Another usage of the oil in a transformer is the detection of faults and prediction of service life by analysing dissolved gases formed at extreme temperatures or during partial discharge and arcs. Therefore, even without the need to disconnect the transformer, potential faults can be detected in advance, and necessary precautions can be taken.

Mineral oils have been used for more than 100 years as coolants and insulating liquids for transformers [2,3]. However, in recent decades, the reduction of mineral oil reserves and sustainability goals with renewable energy have become core issues worldwide. The adverse environmental effects of mineral oil, lack of mineral oil reserves, leakage risks and waste oil disposal prompted researchers to focus on biodegradable and renewable insulating materials. Of all the eco-friendly substitutes for mineral oil, esters are the most widely used insulating fluids.

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