• Model: REL670 | Part No.: 1MRK002801-AA | Brand: ABB (Hitachi Energy)
• Type: Line Distance Protection & Control IED | Series: Relion 670
• Rated Voltage: 110/220V DC (auxiliary); 690V–500kV system applicable
• Rated Current: 1A/5A CT input | Frequency: 5–95Hz
• Protection Zones: 5 distance zones (phase/earth); quadrilateral/mho characteristics
• Communication: IEC 61850 (GOOSE/MMS), IEC 60870-5-103, Modbus TCP, DNP3
• Data Recording: 40 analog + 96 binary channels; fault recorder (up to 40s)
• Operating Temp: −25°C ~ +70°C | Protection Class: IP54
• Dimensions: 220 × 180 × 154 mm | Weight: ~3.5 kg
• Certifications: IEC 60255, IEEE C37.90, CE, UL, RoHS

• 5-zone distance protection (21): quadrilateral/mho, series-compensated line support
• High-impedance differential (87) & sensitive earth fault protection
• Overcurrent (50/51), directional overcurrent (67), voltage (27/59), frequency (81)
• Power swing detection, out-of-step protection, load encroachment blocking
• Breaker failure, auto-reclosing, synchronism check & dead-line detection
• Bay control, interlocking, HMI local operation & SCADA remote control

• Power Utilities: Transmission line protection (110kV–500kV)
• Renewable Energy: Wind/solar farm grid connection lines
• Industrial Grids: Large plant distribution cables & line-transformer units
• Railway Electrification: High-speed rail power supply lines

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