By Corné Dames

New insulating liquid materials development is guided by multiple factors such as environmental requirements and other safety and economic considerations. Therefore, transformer manufacturers have to consider new specifications related to these new requirements.

The vegetable-oil based transformer fluids are increasingly replacing mineral oil-based products in the marketplace. These oils are successful because they perform better in various aspects than mineral oil products and they provide definite environmental and safety gains.

However, some modifications to natural esters are needed to make them more competitive as an insulating fluid. By filtration, nanoparticles addition and oxidation stabilisers added, these natural ester fluids display the necessary characteristics to compete with mineral oils as a replacement for dielectric fluid as part of the transformer insulating systems.

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This article was originally published in the June 2019 issue of the New Technology Changing the Heart of Power Systems magazine.

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