ABB RET545 Transformer terminal Numerical Relay

ABB RET 545 Transformer terminal Numerical Relay

ABB RET 545 Relay terminals are loaded with functionality to suit your application. Besides the three-phase stabilized current differential function featuring 2nd and 5th harmonic restraint, the basic version terminals incorporate three-phase over-current, non-directional earth-fault, restricted earth-fault, transformer thermal overload and phase unbalance protection.

These multi-version terminals further include over-voltage and under-voltage supervision, directional earth-fault, residual voltage and over-excitation protection, over-frequency and under-frequency protection, and under-impedance protection. Enhanced with an optional automatic voltage regulator function the RET 545 terminal forms an integrated transformer management unit.

A special control version terminal with just voltage regulator and control functions is also available.

Scope

Transformer protection relay

Product benefits

• Withstands harsh environments e.g. in heavy industry, marine and offshore applications
• Programmable logic functions (PLC)
• Wide support for different communication protocols
• Optical communication for fast disturbance-free communication