Special Oil Transformers

For some applications, the transformer, whether hermetically sealed or free-breathing, with fins or radiators, has a customised tank design to allow the connection of other components present in the transformation cabin.

These instruments could be an MV or LV circuit breaker or switch. For some markets, the MV and LV terminals can be supplied laterally with the possibility of inspection of the transformer from above using a porthole or by removing the cover.

What is a Special Oil Transformer?

A Special Oil Transformer is an oil‑filled unit with a customised tank design tailored to fit additional equipment inside a transformation cabin, such as MV or LV circuit breakers or switches; it can be built as hermetically sealed or free‑breathing and fitted with fins or radiators to suit site and thermal requirements.

How does a Special Oil Transformer work?

It operates like a standard oil‑immersed transformer, but the tank is adapted to allow mechanical and electrical connections to other components, with terminals that can be arranged laterally and access provided from above via a porthole or removable cover, while fins, radiators or internal cushions manage oil expansion and cooling.

What are the benefits of a Special Oil Transformer?

The main benefits are space and integration. You get a single, compact assembly that combines the transformer and switching or protection gear, simplified installation and easier inspection, plus the flexibility to specify hermetic or free‑breathing construction and appropriate cooling for the application.

Where are Special Oil Transformers used?

They are used wherever a compact, integrated solution is needed in a transformation cabin or substation. For example, in industrial plants, utility substations and bespoke installations that require on‑tank circuit breakers, lateral terminal arrangements or top access for inspection and maintenance.