ABB GPU2000R REG544 Generator Protection Relay

Overview

The REG544 GPU2000R (1SABB084621R0001) is a microprocessor-driven generator protection relay engineered for the comprehensive protection of synchronous generators operating in utility, industrial, and renewable-energy power systems. Developed by ABB, this unit is part of the proven GPU2000R platform, designed to deliver fast fault detection, precise protection logic, and continuous operational monitoring.

This relay integrates multiple generator protection functions into a single compact device, reducing system complexity while improving reliability and diagnostic transparency.

Protection Capabilities

The REG544 GPU2000R (1SABB084621R0001) implements advanced protection algorithms to safeguard generators against electrical and mechanical stress conditions:

• Phase overcurrent protection

• Ground fault protection

• Overvoltage and undervoltage supervision

• Underfrequency protection

• Reverse power and anti-motoring protection

• Loss-of-excitation detection using impedance-based (Mho circle) principles

• Rotor earth-fault monitoring

• Continuous supervision of voltage, current, frequency, and excitation status

Reverse-power sensitivity is optimized for generator protection, with detection thresholds down to approximately 0.2% of rated power, allowing early intervention before mechanical damage occurs.

Electrical Ratings

• Phase current input range: 2.0–8.0 A

• Ground current input range: 2.0–8.0 A

• Auxiliary supply voltage: 38–58 VDC

• Nominal system frequency: 60 Hz

Inputs, Outputs, and Logic

• 8 programmable binary inputs for external status and interlocking signals

• 6 configurable output relays for trip, alarm, and control actions

• Integrated programmable logic enables customized protection schemes

• Internal timers for runtime supervision, alarms, and event sequencing

Monitoring and Diagnostics

• Real-time electrical metering for generator operating conditions

• Event and disturbance recording for post-fault analysis

• Non-volatile flash memory firmware supporting updates and parameter retention

• Self-diagnostics with alarm signaling for internal failures

Mechanical and Environmental Characteristics

• Form factor: Panel-mounted protection unit

• Dimensions: 200 × 200 × 100 mm

• Weight: 23 lb

Typical Applications

• Utility and captive power plants

• Industrial cogeneration systems

• Renewable-energy generator installations

• Synchronous generators connected to medium-voltage grids

Frequently Asked Questions

Q: Is the REG544 suitable for both utility and industrial generators?
A: Yes. The relay is designed for synchronous generators across utility, industrial, and renewable-energy applications.

Q: Does the unit support customizable protection logic?
A: Yes. The integrated programmable logic allows users to adapt protection schemes to specific generator and grid requirements.

Q: Can this relay operate with DC control power only?
A: Yes. The auxiliary supply range of 38–58 VDC supports typical DC control systems used in power plants.