Substation transformers transfer the incoming high voltage to the next lower voltage level. As an example, incoming high voltage of 400 kV would be transferred down to 220 kV.
In general substation transformers are equipped with on-load-tap changers (OLTC). Incoming transmission lines are connected to the transformers through bushings and cables through cable boxes and cable sealing ends. These transformers are built in core form with auto connected windings, ie common main winding and a separate low voltage winding.
- Ratings up to 1,300 MVA (sometimes higher ratings are required)
- Primary voltage up to 765 kV and higher
- Secondary voltage generally <= 230kV or higher depending on the grid configuration
- Load tap changers generally required
- Single- or three-phase
Why ABB core intertie transformers?
- ABB track record of 1,400+ units delivered since 1995
- Short circuit performance at twice the industry standard
- Proven track record in meeting customer performance requirements. Ask for ABB's test floor failure statistics
- 12 factories - one global approach - bringing consistency, delivery performance and technology
Why ABB shell intertie transformers?
- Design technology eliminates the risk of a hot spot
- Outstanding thermal performance resulting from directed oil flow, minimization of losses and control of the hot spot