ABB RED670 1MRK002810-AC Line Differential Protection

Product Overview

The ABB RED670 (1MRK002810-AC) is an advanced Intelligent Electronic Device (IED) specifically engineered for the high-speed protection of overhead transmission lines and underground cables. As part of the Relion® 670 series, it utilizes the "Unit Protection" principle, comparing the instantaneous current values at both ends of the protected zone via a dedicated communication link. 

Technical Specifications

• Manufacturer: ABB

• Model Number: RED670 (Part: 1MRK002810-AC)

• Frequency: 50/60 Hz (Auto-detecting)

• Operating Temperature: -40°C to +70°C

• Protection Speed: Sub-cycle fault detection and clearance

• Environmental: 5% to 95% RH (Non-condensing)

• Physical: 230 mm x 160 mm x 100 mm; Weight: 1.5 kg

• Compliance: Full IEC 61850 support for digital substation integration

Key Features & Engineering Advantages

• Phase-Segregated Differential Protection: Evaluates each phase independently, providing superior performance for single-phase-to-earth faults, which are the most common on transmission grids.

• Communication Flexibility: Supports various communication media, including direct fiber optic links or multiplexed networks (SDH/SONET), ensuring the two relays at either end of the line remain perfectly synchronized.

• Adaptive Algorithms: The unit automatically adjusts its sensitivity based on load conditions and charging currents, effectively eliminating nuisance trips on long, high-voltage cables.

• Multi-Application Support: Beyond line protection, the RED670 includes functional libraries for busbar and transformer protection, making it a versatile asset for substation engineering.

• Sub-Cycle Operation: Rapidly identifies internal faults to trigger circuit breakers within milliseconds, minimizing the thermal and mechanical stress on expensive grid infrastructure.