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Transformer protection

ABB’s protection solutions are designed to ensure safe and reliable operation of 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:

Typical applications

Group 1 protection unit, basic version
  • Biased differential protection for transformers / autotransformers
  • Current- and thermal-overload protection
  • Voltage protection
  • Overexcitation
  • Disturbance recorder

Group 2 protection unit, basic version
  • High-impedance/low-impedance restricted earth-fault (REF) protection on the primary and/or secondary winding for transformers
  • Per-phase high-impedance protection (for autotransformers)
  • Non-directional overcurrent protection
  • Tertiary earth-fault protection
  • Disturbance recorder
  • Busbar and breaker-failure protection schemes (decentralized) can be accommodated in transformer protection solutions.
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