ABB RET543 Generator Controller Combined Numerical Relay

ABB RET 543 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.

The 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 terminal forms an integrated transformer management unit.

A special control version terminal, which includes just voltage regulator and control functions is also available.

Scope

• Transformer protection relay

ABB RET 543 Relay 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

Product features

• Three-phase current differential protection with stabilized and instantaneous stages for fast and selective winding short-circuit and interturn fault protection
• Optional automatic on-load tap-changer control function for single or parallel transformers
• Support for IEC 61850 and Profibus DP protocols through adapters
• 25 binary inputs and 18 output relays