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- ABB
- REM 545
- Machine Protection Terminal
- Sweden (SE)
- 265.9 × 223.7 × 235 mm
- 8 kg
- Xiamen, China
- New & In Stock
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Product Overview
The ABB REM 545 Machine Protection Terminal is a rotating machine protection and control device used for generators, generator-transformer units, synchronous motors, and large asynchronous motors. It combines protection, measurement, control, condition monitoring, and communication functions in a single terminal, making it suitable for applications where several machine protection functions need to be coordinated within one device.
In generator applications, the REM 545 monitors electrical conditions such as current, voltage, frequency, power, and other operating parameters. Protection functions can be configured for faults and abnormal operating conditions including overcurrent, earth fault, overvoltage, undervoltage, thermal overload, unbalanced load, abnormal frequency, underexcitation, and power-related operating conditions.
For medium-voltage motors, the terminal can be applied to important equipment such as pumps, fans, mills, and crushers. Motor start-up supervision and protection functions help distinguish normal acceleration from conditions such as stalled starting or excessive thermal loading.
The REM 545 also incorporates programmable logic and communication capabilities, allowing protection decisions, interlocking, control sequences, alarms, and monitoring information to be coordinated within the machine protection architecture. It was also used as part of ABB substation automation solutions and supported communication with higher-level control and monitoring systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | REM 545 |
| Product Family | ABB REM 54 Series |
| Product Type | Machine Protection Terminal |
| Manufacturer | ABB |
| System Role | Rotating Machine Protection and Control |
| Primary Function | Generator and Motor Protection |
| Supported Equipment | Generators, Generator-Transformer Units, Synchronous Motors, Large Asynchronous Motors |
| Protection Functions | Overcurrent, Earth-Fault, Voltage, Frequency, Thermal, Unbalance and Machine-Specific Protection |
| Measurement | Current, Voltage, Frequency, Power, Energy and Related Electrical Parameters |
| Communication | Serial Communication / Substation Automation Communication |
| Dimensions | 265.9 × 223.7 × 235 mm |
| Weight | 8 kg |
Product Features
- Integrated protection, measurement, control, monitoring, and communication functions.
- Suitable for generator and generator-transformer protection applications.
- Supports protection of large synchronous and asynchronous motors.
- Handles electrical abnormal conditions including overcurrent, earth fault, voltage, frequency, thermal, and unbalanced-load conditions.
- Supports motor start-up supervision for demanding motor applications.
- Provides programmable logic functions for automation and interlocking sequences.
- Supports local and remote control of switching equipment.
- Provides internal self-supervision and condition monitoring functions.
- Supports current and voltage measurement through compatible measuring transformers or sensors.
- Can interface with higher-level substation automation and monitoring systems.
- Optional RTD and analog I/O functions can be used for temperature and process-related monitoring.
- Suitable for industrial power plants and rotating-machine protection architectures.
Working Principle
The REM 545 receives electrical measurement signals from the protected machine through compatible current and voltage measurement circuits. These signals are processed by the terminal and compared with configured protection thresholds and operating conditions.
When the measured electrical or operating condition reaches a configured protection level, the corresponding protection function generates an alarm or trip command. Programmable logic can combine protection information with breaker status, interlocking conditions, and control commands before the final output is issued.
Generator / Motor → CT / VT / Sensors → REM 545 → Protection & Logic Processing → Trip / Alarm / Control → Switchgear
For motor applications, the terminal can also supervise the starting process. Starting-related measurements and protection logic help identify abnormal acceleration, excessive thermal loading, or stall conditions before they develop into more serious equipment faults.
Role in a Machine Protection Control Architecture
The REM 545 acts as the central protection and monitoring terminal between the rotating machine, measurement transformers or sensors, switchgear, and higher-level automation system.
Protected Machine → Measurement Interface → REM 545 → Protection Logic → Circuit Breaker / Alarm → Station Control System
| System Element | Function |
|---|---|
| Generator / Motor | Protected rotating machine |
| CT / VT / Sensors | Provide electrical measurement signals |
| REM 545 | Protection, measurement, logic, monitoring, and control |
| Circuit Breaker | Disconnects the protected machine during a trip |
| Alarm System | Reports abnormal operating conditions |
| Substation Automation System | Supervises and coordinates protection information |
| HMI / Engineering System | Provides configuration, monitoring, and diagnostic access |
Industrial Applications
| Application | Typical Use |
|---|---|
| Diesel Power Plants | Generator and generator-transformer protection |
| Hydroelectric Plants | Generator protection and monitoring |
| Steam Power Plants | Rotating-machine protection |
| Medium-Voltage Motors | Protection of critical motor feeders |
| Pump Systems | Motor protection and start-up supervision |
| Fan Systems | Protection of large industrial motors |
| Mills | Protection of high-power motor drives |
| Crushers | Motor protection during demanding starting cycles |
| Industrial Power Distribution | Integrated machine protection and control |
| Marine Applications | Compact rotating-machine protection solutions |
Installation and Maintenance
- Verify the REM 545 model and hardware configuration before installation.
- Confirm that the selected terminal configuration matches the protected generator or motor.
- Install the terminal in a suitable protected control or switchgear environment.
- Follow the approved wiring diagram for current and voltage measurement circuits.
- Verify CT polarity and phase identification before energizing the protection system.
- Check voltage measurement wiring and phase sequence carefully.
- Confirm auxiliary power connections before commissioning.
- Verify binary input and output assignments against the protection logic.
- Check circuit-breaker status and trip-circuit supervision signals.
- Review protection settings before placing the machine into normal operation.
- Test protection, alarm, interlocking, and trip functions during commissioning.
- Keep the configuration, protection settings, communication parameters, and application logic available for future maintenance or replacement.
Related Components
| Component | Function |
|---|---|
| Current Transformer | Provides machine current measurement |
| Voltage Transformer | Provides machine voltage measurement |
| Circuit Breaker | Disconnects the protected machine |
| Motor / Generator | Protected rotating equipment |
| RTD / Temperature Sensors | Monitor winding, bearing, or ambient temperature |
| Protection Test Equipment | Used for commissioning and relay testing |
| Substation Automation System | Collects protection and monitoring information |
| HMI / Engineering PC | Configuration and operational supervision |
| Communication Interface | Transfers terminal information to higher-level systems |
| Switchgear | Provides electrical isolation and switching |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| ABB REM 543 | Machine Protection Terminal | Generator and motor protection |
| ABB REM 54 Series | Rotating Machine Protection Family | Generator and motor applications |
| ABB REF 541 | Feeder Protection Terminal | Feeder protection and control |
| ABB REF 543 | Feeder Protection Terminal | Distribution and substation protection |
| ABB REF 545 | Feeder Protection Terminal | Advanced feeder protection |
| ABB RET 541 | Transformer Protection Terminal | Transformer protection and control |
| ABB RET 543 | Transformer Protection Terminal | Transformer protection applications |
| ABB RET 545 | Transformer Protection Terminal | Advanced transformer protection |
| ABB REU 610 | Voltage Protection Relay | Voltage monitoring and protection |
| ABB REX 521 | Protection and Control Terminal | Distribution protection and control |
Key Advantages
- Combines multiple machine protection functions in one terminal.
- Suitable for both generator and large motor protection.
- Supports protection against electrical faults and abnormal machine operating conditions.
- Integrates protection with measurement, control, monitoring, and programmable logic.
- Reduces the need for separate protection and automation devices in suitable applications.
- Supports integration into broader substation automation architectures.
- Provides self-supervision and diagnostic capabilities for maintenance.
Technical FAQs
What type of equipment is the ABB REM 545 normally used to protect?
The REM 545 is intended for rotating-machine protection. Typical applications include small and medium-power generators, generator-transformer units, medium-voltage synchronous motors, and large asynchronous motors.
Can the REM 545 be used for motor start-up protection?
Yes. Motor applications can use start-up supervision and related protection functions to monitor the motor during acceleration. This is particularly useful for large motors driving pumps, fans, mills, crushers, and other high-inertia loads.
What should be checked when replacing an REM 545 in an existing protection system?
The replacement should be checked against the original hardware configuration, measurement connections, protection settings, binary I/O assignments, communication parameters, programmable logic, and machine-specific protection requirements. A functionally similar terminal should not be installed without verifying the complete application configuration.
What can cause an REM 545 protection system to issue an unexpected trip?
Possible causes include incorrect protection settings, abnormal CT or VT signals, genuine machine faults, incorrect phase or polarity connections, communication or logic conditions, and external trip/interlocking signals. The event records, measured values, protection status, and external circuit conditions should be checked before changing protection settings.