ABB REM543BG215AAA A Machine Terminal

The ABB REM543BG215AAA A is a numerical machine terminal from the REM 543 series, specifically designed for the protection, control, and monitoring of generator-transformer units in power generation and industrial applications. This model features a particular hardware and software configuration (BG215AAA A) optimized for medium to large generator-transformer blocks, integrating a comprehensive set of protection functions, advanced automation capabilities, and flexible communication options.

Protection Functions

The REM543BG215AAA A offers a full range of protection elements essential for safeguarding generators and step-up transformers. Key functions include:

• Differential protection (87G, 87T): High-impedance or biased differential with second and fifth harmonic blocking to prevent maloperation during inrush and overexcitation.

• Stator earth fault protection: 95% and 100% coverage using third-harmonic voltage and injection methods.

• Rotor earth fault protection: Single or two-stage with AC or DC injection.

• Overexcitation (V/Hz): Inverse-time characteristic with definite time limit.

• Overcurrent (50/51): Three-phase and earth fault with directional options (67/67N).

• Negative sequence overcurrent (46): Protects against unbalanced loads.

• Directional power (32): Reverse power and low forward power protection.

• Voltage protection: Undervoltage (27), overvoltage (59), residual overvoltage (59N).

• Frequency protection: Under/overfrequency (81U/O) and rate of change of frequency (81R).

• Thermal overload: For stator and transformer windings.

All protection stages are independently configurable with definite time or inverse time characteristics (IEC, IEEE, or user-defined curves).

Control and Automation

The terminal includes a powerful programmable logic controller (PLC) functionality that enables customized interlocking, sequencing, and automation schemes. It supports synchronism check (25) and auto-synchronizing for generator connection to the grid, with adjustable phase angle, voltage, and slip limits. The device can control circuit breakers, disconnectors, and tap changers directly via its binary outputs. The integrated disturbance recorder captures fault waveforms with high resolution (up to 32 samples/cycle) for post-fault analysis. Measured values (I, U, P, Q, f, cosφ) are displayed locally on the graphical LCD and transmitted via communication links.

Communication and Integration

The REM543BG215AAA A supports multiple communication protocols for seamless integration into substation automation systems. Standard rear communication ports provide options for IEC 61850 (including GOOSE messaging), IEC 60870-5-103, Modbus RTU, and DNP3.0. Redundant Ethernet options are available for high availability. Time synchronization via IRIG-B or SNTP ensures accurate event time-stamping. The front panel includes an HMI with keypad and LCD for local operation and configuration. The device is fully compatible with ABB's MicroSCADA and Network Manager systems, as well as third-party SCADA platforms.

Technical Specifications

• Measuring inputs: 4 current inputs (1/5 A) and 4 voltage inputs (100-230 V AC).

• Binary I/O: Up to 24 binary inputs and 16 output relays, depending on configuration.

• Power supply: 80-265 V DC or 100-240 V AC.

• Case: 6U high, 19" rack or flush mount, IP54 front.

• Operating temperature: -10°C to +55°C.

• Self-supervision: Continuous hardware and software monitoring with watchdog output.

Typical Applications

The REM543BG215AAA A is used in utility power stations, industrial co-generation plants, and renewable energy installations. It is particularly suited for protecting generator-transformer blocks where a high degree of reliability and communication integration is required. Its modular design allows adaptation to various generator types (steam, gas, hydro) and transformer configurations.

With its robust design, comprehensive protection algorithms, and advanced communication capabilities, the ABB REM543BG215AAA A machine terminal ensures reliable operation of critical generation assets, reduces downtime, and simplifies asset management through integration with modern substation automation systems.