Customers specify non-auto transformers for network applications when separate grounding systems between the high-voltage and low voltage is required.
Substation non-autotransformers, like autotransformers, transfer the incoming high-voltage to the next voltage level. As an example, an incoming high-voltage of 400 kV would be transferred down to 220 kV.
In general, they are equipped with on-load tap changers (OLTC) and are connected to the grids by bushings and cables. Non-autotransformers are built-in core forms with windings facing full power; that is, HV windings and LV windings are galvanically separated.
Product scope:
- Ratings up to 1,300 MVA (or higher as required)
- Primary voltage up to 765 kV and higher
- Secondary voltage, in general, <= 230kV or higher depending on a grid configuration
- Load tap changers available
- Single-phase or three-phase
Why Hitachi Energy
- A world leader with 1,000+ transformers delivered annually from 12 factories
- Twice the industry level on short circuit reliability
- The lowest noise level transformers available in the market
- Global methodology passed down through generations – BBC, ASEA, Westinghouse, General Electric, then Hitachi Energy
