ABB REM 543 Machine Terminal REM543BG214AAA A

General Description

The REM 543 is a member of ABB's REM 500 series of protection terminals, specifically designed for the protection, monitoring, and control of generators, motors, and transformers. The variant REM543BG214AAA A includes a specific hardware configuration with enhanced I/O and communication options. It integrates multiple protection functions into a single unit, reducing the need for separate relays and simplifying engineering.

Protection Functions

• Differential Protection: 87G for generators, 87T for transformers, with second-harmonic blocking.

• Overcurrent Protection: Phase and earth fault (50/51/50N/51N) with definite time or inverse characteristics.

• Stator Earth Fault Protection: 100% stator earth fault using injection or third-harmonic voltage.

• Rotor Earth Fault Protection: For brushless or slip-ring machines.

• Overexcitation (Volts/Hz): 24, with alarm and trip stages.

• Under/Overvoltage and Frequency: 27/59, 81U/81O.

• Reverse Power / Low Forward Power: 32R/32F.

Hardware Specifications

• Processor: 32-bit, 150 MHz, with DSP for signal processing.

• Analog Inputs: 4 current inputs (1 A or 5 A), 4 voltage inputs (100-230 V AC).

• Digital Inputs: 16, 24-250 V DC, programmable.

• Output Relays: 12, with trip, alarm, and signalling functions.

• Communication Ports: 2x RJ45 Ethernet (IEC 61850-8-1, Modbus TCP), 2x RS485 (Modbus RTU, DNP3), 1x front USB.

• HMI: Local display with 4-line text and keypad for settings and monitoring.

Technical Data

• Auxiliary Voltage: 80-265 V AC/DC, or 24-60 V DC.

• Power Consumption: < 15 W.

• Operating Temperature: -25°C to +55°C.

• Degree of Protection: IP54 (front), IP20 (rear terminals).

• Dimensions: 177 x 266 x 210 mm (H x W x D), 19" rack mountable.

Monitoring and Recording

The REM 543 includes continuous self-supervision, event logging (up to 1024 events), fault recording (up to 120 s), and disturbance recording (up to 10 s). It also features phasor measurement and synchrocheck functionality for breaker control.

Communication and Integration

With native IEC 61850 Ed. 2 support, the terminal seamlessly integrates into modern substation automation systems. It also supports IEC 60870-5-103, Modbus, and DNP3 for legacy system compatibility. The redundant Ethernet ports enable PRP/HSR topologies for high availability.

Applications

Ideal for power plants, industrial facilities, and large motor drives. The REM543BG214AAA A configuration is particularly suited for medium-sized generators and power transformers up to 40 MVA.

Note: Technical data presented here is for reference; consult the official ABB relay manual for detailed engineering guidelines.