Trafo

Koopmann Transformatoren

We maintain a comprehensive in-house inventory of approximately 210 oil-filled and cast resin transformers with a wide range of power and voltage ratings, some of which are available for immediate delivery or with very short lead times.

These units can be accessed via our online database, which allows for the generation of customized data sheets. The database includes an internal search function and is updated daily with incoming and outgoing stock information.

Thanks to our close relationships with various transformer manufacturers, we can also offer you new transformers at optimized prices and with short delivery times.

Furthermore, as former employees of TRO Berlin (Transformer Factory Oberschöneweide), we specialize in the maintenance and repair of oil-filled transformers in the power range of 50 kVA to 63000 kVA, with voltage levels between 6 kV and 110 kV.

We also offer our customers the conversion of transformers from a Dehner design to a hermetically sealed design. In this context, the entire transformer is overhauled, which means:

- Drying of the core and transformer oil,
- New coating of the tank,
- Re-tensioning of the core,
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- Conversion to Elastimold bushings (optional),
- Renewal of all seals,
- Final testing (winding resistances, turns ratio measurement, and insulation resistances) in our own electrical test field, including a high-voltage test.

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