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alstom(areva)MR627

The Alstom MR627 (originally developed by Areva) is a digital protection relay designed for railway traction power systems and medium voltage distribution networks. It provides advanced fault detection, measurement, and control for AC/DC electrification systems, ensuring safe and reliable power supply to rail infrastructure.

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Key Features
1. Advanced Protection Functions
Overcurrent, earth fault, and differential protection

Distance protection (impedance-based for overhead lines)

Arc flash detection for enhanced safety

2. Railway-Specific Adaptations
EN 50155 compliant (railway electronic equipment)

SIL2 certified (EN 50126/8/9 for safety-related functions)

Immunity to harmonics & transient disturbances (EN 50121-3-2)

3. Smart Monitoring & Control
Real-time metering (voltage, current, power, harmonics)

Event recording & fault analysis (up to 1000 events)

Ethernet & RS-485 communication (IEC 61850 & Modbus support)

4. Rugged & Maintenance-Friendly
-25°C to +70°C operating temperature

Front-access HMI with LCD display

Modular design for easy servicing

Technical Specifications
Parameter Specification
Voltage Range 15kV–36kV AC / 1.5kV–3kV DC
Current Inputs 5A or 1A (configurable)
Protection Speed <20ms for overcurrent faults
Communication Ethernet, RS-485, IEC 61850
Power Supply 24V DC / 110V DC / 220V AC
Certifications EN 50155, IEC 60255, UL 508
Applications
✔ Railway traction substations (AC 25kV / DC 1.5kV–3kV)
✔ Catenary protection (overhead line monitoring)
✔ Feeder automation in rail power networks
✔ Industrial medium voltage switchgear

Benefits
✅ High Reliability – Proven Areva/Alstom protection technology
✅ Precise Fault Detection – Adaptive algorithms for railway-specific conditions
✅ Easy Integration – Compatible with SCADA & Alstom Iconis®
✅ Reduced Downtime – Self-diagnostics & event logging