The ABB 1MRK002311-AAR02 is a high-precision, numerical Line Differential Protection Relay, specifically the RED670 model, from ABB’s renowned Relion® 670 series. This device represents the pinnacle of protection technology for high-voltage and extra-high-voltage transmission lines. Its core function is to provide ultra-fast and selective primary protection against a wide range of faults occurring on the protected line segment by continuously comparing the electrical current entering and leaving the line at both ends. Using advanced communication channels (typically fiber optic) to exchange synchronized current data in real-time, the relay performs a differential calculation. Any significant imbalance between the incoming and outgoing current indicates an internal fault within the protected zone, triggering an instantaneous trip command to isolate the line with minimal delay, typically within one cycle (20ms or less). The suffix -AAR02denotes a specific hardware configuration, likely including particular communication interfaces, binary I/O options, and possibly a specific front-panel human-machine interface (HMI).
Beyond its primary differential protection function, the ABB RED670 1MRK002311-AAR02 is a multifunctional protection and control terminal. It integrates a comprehensive suite of backup protection functions such as distance protection (Zones 1, 2, 3), directional earth-fault protection, and overcurrent protection. It also includes advanced features like auto-reclosing, power swing detection/blocking, and breaker failure protection. Equipped with extensive metering, disturbance recording, and communication capabilities (supporting IEC 61850, IEC 60870-5-103/104, and others), it serves as an intelligent node in the substation automation system. For transmission system operators, this relay is a critical asset that ensures grid stability, minimizes fault damage, and enhances power supply reliability by isolating faults with unparalleled speed and selectivity.
Technical Specifications
Parameter Name
Parameter Value
Product Model
ABB 1MRK002311-AAR02 (Relion® RED670)
Manufacturer
ABB
Product Family/Series
Relion® 670 Series
Product Type
Numerical Line Differential Protection Relay
Primary Protection
Current differential protection (87L) with phase-segregated or composite scheme.
Large graphical LCD with keypad or touch screen (depending on variant).
Power Supply
48-250 V DC or 110-230 V AC (order code specific).
Standards
IEC 60255, IEC 61850, IEEE C37.94, etc.
Key Features and Advantages
The ABB RED670 1MRK002311-AAR02 excels through its ultra-fast and absolutely selective primary protection. The current differential principle (87L) provides unit protection, meaning it operates only for faults within its precisely defined zone (between the two sets of CTs). This eliminates the need for time coordination with downstream relays, enabling tripping times of less than 20ms, which is crucial for maintaining power system transient stability, especially on long or heavily loaded transmission lines.
1MRK002133-ABr02
Multifunctional integration and advanced system support are core strengths. It consolidates multiple protection, control, and monitoring functions into a single device, reducing panel space, wiring complexity, and lifecycle costs. Advanced features like adaptive auto-reclosing (considering fault type and dead time) and power swing blocking prevent unnecessary trips during stable power oscillations, enhancing grid resilience. Its support for IEC 61850 (including GOOSE for fast interlocking and Sampled Values for differential communication) makes it a future-proof cornerstone of the digital substation, enabling seamless data exchange and interoperability with other intelligent electronic devices (IEDs).
Superior reliability, diagnostics, and user experience define its operational value. The relay features redundant communication channels and power supplies for high availability. Its powerful disturbance recorder captures detailed pre- and post-fault waveforms and events, which are invaluable for fault analysis. The intuitive local HMI and powerful PCM600 engineering software allow for easy configuration, testing, and monitoring. For transmission asset owners, the ABB RED670 not only provides the fastest possible protection but also delivers deep operational insights, simplified maintenance, and seamless integration into modern, automated grid infrastructure.
Application Areas
The ABB 1MRK002311-AAR02 (RED670) is specifically designed for the protection and control of high-voltage and extra-high-voltage transmission lines in power transmission networks.
Its primary application is as the main protection for two-terminal or multi-terminal transmission lines in voltage levels ranging from 110 kV to 765 kV and above. This includes applications in:
National and Regional Grids: Protecting critical interconnectors and backbone lines that transfer bulk power across regions.
Renewable Energy Integration: Protecting lines connecting large wind farms or solar PV plants to the main grid, where reliable protection is key to renewable energy delivery.
Industrial Power Supply: Protecting dedicated high-voltage feeder lines supplying large industrial complexes (e.g., smelters, chemical plants).
Multi-Terminal Lines (Tapped Lines): Its differential scheme can be adapted for lines with more than two ends.
It is also perfectly suited for use in breaker-and-a-half or double-busbar substation configurations, where its multiple protection functions and extensive I/O can handle complex busbar and breaker failure logic. Essentially, wherever fast, selective, and reliable line protection is paramount for grid security and stability, the RED670 is the technology of choice.
Related Products
ABB REL670 / REF670: Relion 670 series relays for feeder and transformer/bay control applications, respectively, often used in the same substation.
ABB RET670: Transformer protection relay from the same family.
ABB REB670: Busbar protection relay.
ABB PCM600: The universal configuration and monitoring tool for the entire Relion® product family.
ABB CTs & VTs (Current & Voltage Transformers): The high-accuracy instrument transformers that provide input signals to the relay.
ABB FOX615 / FOXMAN: Communication interface modules or network switches used to establish the fiber optic communication channels for the differential protection.
IEC 61850 Process Bus Merging Units (MU): In fully digital substations, these devices digitize CT/VT signals and stream them via IEC 61850-9-2 LE to relays like the RED670.
Synchronization Equipment (GPS/IRIG-B): To provide precise time synchronization for the disturbance recorder and for certain differential schemes requiring time alignment.
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