Branding & design

This transformer changes the relationship between the incoming voltage and current and the outgoing voltage and current. Substation transformers are rated by their primary and secondary voltage relationship and their power carrying capability.

Power Transformers

Most of the transformers supplied to the market by us use Core Type Technology. They are mostly used in customer applications as generator step up and system intertie power transformers. Large Power Transformers are defined within ABB as units with a three-phase power rating higher than 200 MVA or with voltage ratings higher than 275 kV. ABB supplies three phase units up to 1100 MVA and single-phase units up to 500 MVA. Power transformers for system voltages up to and including 800 kV have been delivered to the market since the 1970’s.

HVDC Converter Transformers

The HVDC converter transformer is a key component in an HVDC transmission system. In addition to its normal application to provide transfer of power between two voltage levels, it serves a number of additional functions like galvanic separation between the AC and DC systems. A fairly large tapping range permits optimum operation also for a large variation in load without loss of efficiency.