ABB RED670 1MRK004810-AC Numerical Line Differential Protection Relays

The ABB RED670 1MRK004810-AC, also cataloged as the RED670 Numerical Line Differential Protection Relay, operates as a dedicated hardware component for line differential protection and communication bus management within power transmission systems.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

• Backplane Bus Communication Velocity Licences: Manages high-speed internal bus transaction velocities and internal processor communications.
• Profinet / EtherNet/IP Deterministic Networks: Executes deterministic data packet transfers across communication protocols including IEC 61850, IEC 60870-5-103/104, Modbus, and DNP3.
• I/O Density Scaling: Supports flexible expansion of differential communication channels via direct fiber optic or multiplexed (G.703, PDH/SDH) links.
• Firmware Flash Compatibility: Permits secure firmware upgrades and non-volatile configuration memory flashing without compromising base protection logic parameters.

Frequently Asked Questions

Q: Does the RED670 1MRK004810-AC unit support hot-swapping of internal modules during operation?

A: Hot-swapping is restricted for primary protection core units to prevent unintended tripping or interruption of line differential protection loops.

Q: What rated current options are configurable for this relay?

A: The rated current  is configurable for either 1 A or 5 A inputs.

Field Installation Guidelines

• Mount the relay securely into standard 19-inch electrical protection panels using appropriate structural fasteners.
• Connect the protective ground terminal directly to the substation grounding mesh using low-impedance copper conductors to ensure compliance with IEC 61850-3 and IEEE 1613 environmental standards.
• Route fiber optic differential communication cables through dedicated conduits, maintaining safe bend radius limits and physical separation from high-voltage primary circuits.