ABB REF541EM115BAAA Feeder Protection Relay – Functional Overview
1. Core Protection Functions
Overcurrent Protection (50/51, 50N/51N)
Definite/Inverse Time (DTL/IDMT) curves compliant with IEC 60255-151
Earth fault protection with directional capability (67N)
Short-Circuit Protection (50BF)
Breaker failure detection with configurable timer (0.1–60s)
Thermal Overload Protection (49RMS)
Real-time thermal modeling of cables/transformers (IEC 60255-149)
2. Advanced Grid Support Features
Auto-Reclosing (79)
Programmable sequences (up to 4 shots) with dead-time synchronization
Under/Overvoltage (27/59) & Frequency (81O/U) Protection
Adjustable thresholds for grid code compliance (e.g., EN 50160)
3. Communication & Integration
IEC 61850-8-1 (GOOSE/MSV) for peer-to-peer protection signaling
Modbus TCP/RTU for SCADA integration
DNP3.0 for utility-grade telemetry
4. Monitoring & Diagnostics
Disturbance Recorder (up to 64 events with 256 samples/cycle)
Energy Metering (Class 1 per IEC 62053-21)
Condition Monitoring (CB contact wear, gas pressure for GIS)
5. Hardware Specifications
Environmental: -25°C to +70°C operation (IEC 60068-2)
Mechanical: 19″ rack-mount (4U) or panel-mount
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