Hitachi ABB Power Grids' protection solutions are designed to ensure safe and reliable operation of the transformer and auto-transformer feeders for distribution, sub-transmission, and transmission systems.
Protection solutions for transformers are designed to accommodate different busbar arrangements across all voltage levels and for high-voltage autotransformers. The solutions are intended for the following types of configuration:
- Two- and three-winding transformers in different configurations
- Autotransformers, with or without loaded tertiary winding
The protection functions are split between two groups of hardware (group 1 and group 2) to ensure good reliability. Different protection functions can be allocated to either of the groups, but typical arrangements are as follows: