ABB 1MRK002246-BC Main CPU Module | Relion 670 Series

Product Description

Overview

The ABB 1MRK002246-BC serves as the central processing unit for ABB Relion 670 series protection and control relays, including RED670, REL670, and REC670. As the primary microprocessor module, it executes protection algorithms, manages logic operations, and coordinates communication across all connected peripheral boards. Built for high-voltage substation environments, this module processes real-time signals from voltage and current transformers to make rapid protection decisions.

Key Features

High-Performance Numerical Processing
Optimized for fast floating-point calculations, enabling advanced operations such as:

• Harmonic and fundamental analysis via Fast Fourier Transforms (FFT)

• Execution of complex interlocking and protection logic

Real-Time Operating System (RTOS)
Designed for deterministic timing, ensuring critical protection functions execute within precise windows. Typical trip response times range from 10 to 30 milliseconds.

Integrated Communication Management

• Supports IEC 61850 Station Bus for GOOSE and MMS communication

• Handles sampled values from merging units (IEC 61850-9-2LE)

• Provides maintenance access via Ethernet for PCM600 configuration

Robust Memory and Event Handling

• Non-volatile memory for disturbance waveform recording

• Chronological event and alarm logging

• Configuration retention after complete power loss

Self-Diagnostics and Watchdog Protection
Includes hardware watchdog timers that automatically reset the CPU or signal an “Internal Fail” alarm if software hangs or memory corruption occurs.

Technical Specifications

Applications

Essential for line differential (RED670) and distance protection (REL670) schemes, the CPU module ensures reliable execution of protection, control, and communication functions in critical substation environments.

Maintenance Notes

Replacing the 1MRK002246-BC requires configuration restoration using ABB PCM600 software. Firmware and relay settings must match the specific feeder or transformer, as the module is not plug-and-play.

FAQ

Q: Can this CPU module be used across different Relion 670 variants?
A: Yes, it is compatible with RED670, REL670, and REC670 series, but firmware must be aligned with the specific relay configuration.

Q: What happens if the CPU experiences a software failure?
A: The module contains a watchdog timer that triggers a reset or an “Internal Fail” alarm to prevent undefined states.

Q: Does this module store event and waveform data during a power outage?
A: Yes, non-volatile memory ensures all configuration, event, and disturbance data are retained after complete power loss.

Comparison with Other CPU Modules
Compared to earlier Relion 670 CPU boards, the 1MRK002246-BC offers higher processing speed, larger memory, and enhanced time synchronization options for advanced protection schemes.