By Heinz Raithel

"Given appropriately high-quality standards in development, design, and production, cast-resin transformers are reliable in operation, environmentally compatible, flame-retardant, self-extinguishing, and produce no toxic gases"

One of the main focuses of the ongoing technological development of cast-resin transformers is the exceptional operational reliability and fault tolerance of these highly available components, while also increasing their sustainability and economic viability. Digitalization is currently creating new possibilities for optimizing availability and service life.

Like other transformer types, cast-resin transformers are mainly used where electricity needs to be transformed from the medium-voltage level down to low voltage, or to another incoming mains voltage. Unlike traditional models, they operate with high-voltage windings fully encapsulated in cast-resin insulation instead of transformer oil or other liquid insulating materials, which makes a tank with insulating and cooling liquid unnecessary. Thanks to this apparently simple idea, the technology has been successful ever since its market launch in 1966.

The percentage of cast-resin transformers compared with traditional, oil-immersed transformers continues to grow worldwide - with good reason, as they offer characteristic benefits.

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This article was originally published in the June 2019 issue of the The Dry-Type revolution magazine.

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