Description
The ABB REF545KB133AAAA (part of the ABB RE500 / REF 54_ series) is a multifunctional, microprocessor-based Feeder Terminal and Protection Relay. Designed for comprehensive protection, control, measurement, and supervision of medium-voltage distribution network feeders, power transformers, and substation busbars, the REF 545 combines protection elements (overcurrent, earth fault, voltage, frequency) with a front-panel graphic HMI for local circuit breaker bay control.
Key Specifications & Identification
| Attribute | Details |
| Manufacturer | ABB |
| Model Family | REF 545 (RE500 Series Terminal Platform) |
| Full Order Code | REF545KB133AAAA |
| Device Category | Feeder Terminal Protection & Bay Control Relay |
| Human Machine Interface | High-resolution graphic LCD with single-line mimic diagram, LEDs, & local control keys |
| Protection Elements | 50/51, 50N/51N, 67/67N, 27/59, 81O/81U, 25 (Synchrocheck), 79 (Auto-reclosing), 46, 49 |
| CT/VT Channels | Analog current transformer (CT) and voltage transformer (VT) sensor input channels |
| Fieldbus Interfaces | SPA-bus, LON-bus, IEC 60870-5-103, Modbus RTU, DNP 3.0 |
Primary System Functions
- Comprehensive Feeder Protection: Provides instantaneous and time-delayed directional/non-directional overcurrent, sensitive directional earth-fault, thermal overload, phase unbalance, and under/over-voltage protection functions.
- Integrated Substation Bay Control: Features a front-panel LCD displaying dynamic single-line circuit diagrams (MIMIC) with local open/close pushbuttons for motorized circuit breakers and disconnectors.
- Fault & Power Quality Recording: Logs sequence-of-events (SOE), transient fault waveforms, disturbance records, and power quality parameters (harmonics, voltage dips/swells) for post-fault analysis.
- Substation Automation Integration: Communicates over serial or optical links to stream real-time current, voltage, active/reactive power, and breaker status to plant SCADA and DCS networks.
Servicing & Replacement Guidelines
- CT Secondary Shorting Safety: Never open-circuit energized CT secondary leads. Always engage CT shorting links before extracting or disconnecting relay wiring harnesses.
- ESD & Circuit Board Protection: CMOS processing units and communication cards are sensitive to static electricity. Always wear a grounded anti-static wrist strap during maintenance or board handling.
- Configuration Backup: Upload and save existing protection parameter files (
.ARF/ CAP 505 configuration projects) using ABB CAP 505 / PCM600 tools prior to servicing or replacing an active unit. - Auxiliary Supply & Terminal Isolation: De-energize auxiliary control power (110–240 V AC/DC or 24–60 V DC depending on power supply variant) before connecting or removing rear terminal connectors.
