The ABB REL670 is a sophisticated Intelligent Electronic Device (IED) from the Relion® 670 series, specifically engineered for the high-speed protection, control, and monitoring of transmission lines.
The specific part number 1MRK004812-DC refers to a configuration of the REL670 unit. In ABB’s ordering system, these long alphanumeric codes (beginning with 1MRK…) represent specific hardware and software bundles, including the I/O capacity, communication interfaces, and pre-loaded protection algorithms.
Core Functions & Capabilities
The REL670 is highly regarded for its versatility in transmission networks, providing:
- Full-Scheme Distance Protection: It offers five-zone distance protection for phase-to-phase and phase-to-earth faults. This is effective for overhead lines and underground cables, including complex configurations like parallel lines or series-compensated circuits.
- High Sensitivity: Designed to detect high-resistance faults in heavily loaded lines using load encroachment features.
- System Stability: Includes power swing detection to prevent unwanted trips during system oscillations.
- Integrated Control: Beyond protection, the REL670 can manage bay control functions, such as synchro-check, dead-line detection, and auto-reclosing (single- or three-phase).
- Communication: Supports advanced substation automation protocols, including IEC 61850, which allows for seamless integration into modern digital substations.
When is the REL670 used?
- Transmission Networks: Protecting high-voltage (HV) and extra-high-voltage (EHV) lines.
- Multi-Terminal Lines: Ideal for lines where tripping requirements are complex.
- Retrofitting: Its compact design and high flexibility make it a common choice for upgrading aging infrastructure.
- Backup Protection: Often serves as a high-performance backup for transformers and reactors.
Important Note for Procurement
If you are looking to replace an existing unit or procure a spare for an active system:
- Part Number Sensitivity: The code
1MRK004812-DCis specific to the hardware/software build. Because REL670 units are often configured for specific site requirements, always verify the full order code (which may include additional suffixes) on the nameplate of your existing relay to ensure the new unit is compatible with your current logic, settings, and I/O wiring. - Configuration: These relays are generally delivered “ready-to-use” with pre-configured settings, but they may require site-specific adjustments using ABB’s PCM600 engineering software to align with your specific line impedance and protection coordination studies.
