ABB RET670 1MRK002246-BD Protection Relays Module

The ABB RET670 1MRK002246-BD, also cataloged as the RET670 Protection Module, operates as a dedicated hardware component for high-speed differential protection and switchgear control of power transformers and shunt reactors.

Hardware Specifications

Industrial Control & Backplane Communication Properties

As a specialized Intelligent Electronic Device (IED) within ABB Relion 670 platforms, the RET670 1MRK002246-BD provides real-time processing and grid integration:

• Profinet / EtherNet/IP Deterministic Networks: Communicates across substation Ethernet architectures using native IEC 61850 implementations to transfer high-speed interlocking signals and SCADA telemetry.
• Backplane Bus Communication Velocity: Internal digital processing bus tracks system frequency shifts across wide-band operational ranges to maintain high-speed differential algorithm accuracy during transformer start-up and shutdown events.
• Firmware Flash Compatibility: Internal flash memory supports flexible logic and I/O adaptability, maintaining custom control routines and harmonic restraint profiles across system firmware updates.

Frequently Asked Questions

Q: Are external interposing current transformers (CTs) required for phase-angle and ratio matching on the RET670 1MRK002246-BD?

A: No, the RET670 utilizes software-based compensation to eliminate the need for interposing CTs while maintaining low requirements on main CTs.

Q: How many differential protection functions can a single RET670 IED host simultaneously?

A: The device can host two independent differential protection functions within a single unit to support multi-winding transformer schemes.

Field Installation Guidelines

Proper mechanical and electrical installation practices ensure protection stability during transformer energization and switching operations:

• Panel Mounting and Earth Grounding: Mount the IED in a standard 19-inch panel rack cutout. Connect a dedicated copper grounding strap from the chassis frame ground stud directly to the substation earth ground bar to eliminate high-frequency noise coupling.
• CT/VT Terminal Connections: Secure all incoming current transformer secondary leads to the rear compression terminals. Ensure CT shorting switches are in place and verified prior to performing maintenance on the device logic modules.
• Communication and I/O Cabling: Connect shielded Ethernet cables for IEC 61850 communication. Separate low-voltage I/O wiring for bay control and interlocking from high-voltage primary control circuits to prevent induced surge interference.