Description

Key Technical Specifications

Brand: ABB
Order Number: 1MRK004810-CC
Device Type: Line Differential Protection Relay
Primary Protection: Line Differential (87L), Distance Protection (21)
Measurement Accuracy: <0.25% for Current & Voltage, <0.5% for Power
Communication Protocols: IEC 61850-8-1, IEC 60870-5-103, LON, SPA
Fiber Optic Support: C37.94, G.703, Multiplex & Dedicated networks
Breaker Arrangement: Supports Single or Multi-breaker (up to 1.5 breaker)
Disturbance Recorder: 40 analog signals, 96 binary signals
Time Synchronization: GPS, IRIG-B, or Echo method

Product Introduction

Protecting high-voltage transmission lines is a high-stakes game where a single millisecond of delay or a false trip can cost a utility millions. The ABB RED670 (1MRK004810-CC) is a beast in the substation world, acting as a highly reliable line differential protection relay. It is specifically designed to handle the complexities of multi-terminal lines, heavy-load cables, and even generator-transformer feeders with absolute precision.What makes engineers trust the RED670 is its raw measurement accuracy and flexible configuration. With a current and voltage accuracy of better than 0.25%, it provides incredibly stable protection even during heavy through-faults. It supports up to 6 CT groups and can manage complex arrangements like ring bus or 1.5 breaker setups natively. I have deployed these on 220kV lines where the fiber optic synchronization had to be flawless over 40km, and the RED670 handled the C37.94 protocol without breaking a sweat. Just a heads-up: this unit ships with many advanced functions turned “Off” by default, so be ready to configure it in PCM600.

Quality SOP & Tech Pitfalls (The Reality Check)

The Lab Report (SOP)
We treat every RED670 relay as a mission-critical asset. Here is our pre-shipment checklist:

Visual & Seal Inspection: We verify the 1MRK004810-CC label matches the chassis and check for any physical damage to the fiber optic ports.
Power-Up Test: The unit is powered on to verify the local HMI (Human Machine Interface) boots up correctly and the display has no dead pixels.
Communication Handshake: We test the rear communication ports to ensure the IEC 61850 or LON modules are responsive.
Anti-static Packaging: The relay is sealed in heavy-duty anti-static bags with shock-absorbing foam, as the internal boards are highly sensitive to transit vibration.

The Engineer’s Warning (Pitfalls)
The most common headache with the RED670 is the Application Configuration. Out of the box, the main protection functions (like the differential element) are often disabled to prevent accidental tripping during installation. If you mount it and wonder why it isn’t picking up faults, check your PCM600 configuration—you likely need to enable the specific protection blocks. Also, pay close attention to the CT polarity and phase sequence. With such high accuracy (0.25%), even a minor wiring error will cause the differential protection to see a false internal fault and trip immediately.

Installation & Configuration Guide

Follow this guide to get your RED670 online safely.

Pre-Installation: ⚠️ Safety First. Ensure all CT (Current Transformer) secondary circuits are shorted before disconnecting any wiring to prevent dangerous high voltages. Verify the DC supply voltage matches the relay’s rating.
Removal & Mounting: If replacing an old unit, label every wire and fiber optic cable (Tx/Rx). The RED670 is typically rack or panel mounted; ensure the cutout dimensions match the RELION 670 series specs. Secure the unit firmly to avoid vibration issues.
Wiring & Fiber Optics: Connect the CT and VT inputs carefully, double-checking polarity. Crucial Step: When connecting the fiber optic cables for differential protection, ensure Tx connects to Rx at the remote end. Use the correct C37.94 or G.703 interface as configured.
Power-On & Testing: Apply auxiliary power. The relay will run a self-supervision check. Use the local HMI to check for any “Hardware Fault” alarms. Connect your engineering laptop via the front USB or rear Ethernet to verify the configuration and enable the protection functions.

Compatible Replacement Models

The RELION 670 series is highly modular, so replacements depend on your specific ordering code.

✅ Drop-in Replacement: RED670 1MRK004810-CC. This is the exact match. Ensure the suffix (CC) matches your original order code, as it dictates the specific hardware I/O and communication modules installed.
⚠️ Software Compatible: RED670 1MRK004810-xx (Different Suffix). Other RED670 variants share the same core hardware platform. They can physically fit, but you will need to re-download the specific application configuration via PCM600 to match your substation’s logic (e.g., single vs. multi-breaker).
❌ Hardware Mod Required: RED615 / RED630. These are lower-tier feeders in the RELION family. They lack the multi-terminal differential capabilities and advanced communication ports of the RED670. Do not attempt to substitute these for a main transmission line.

Frequently Asked Questions (FAQ)

Does this relay support IEC 61850 GOOSE messaging?
Yes. The RED670 comes with a built-in data communication module for the station bus IEC 61850-8-1. It fully supports GOOSE for fast horizontal communication between bays, which is standard for modern digital substations.Can I use this for a 3-terminal transmission line?
Absolutely. The RED670 is designed to handle multi-ended lines. It supports differential protection for 2 to 3 line ends (and up to 5 ends with specific configurations). Just ensure your fiber optic network is set up to handle the multi-drop or star topology.What software do I need to configure the 1MRK004810-CC?
You will need ABB’s PCM600 engineering tool. This is the standard platform for connecting to, configuring, and diagnosing all RELION 670 series relays. Make sure your PCM600 version is compatible with the relay’s firmware revision.Is the fiber optic interface included or an add-on?
The 1MRK004810-CC typically includes the communication modules as per the order code. It supports C37.94 and G.703 protocols for differential protection signaling. Always check the rear panel of the physical unit to confirm which specific communication cards are plugged in.How accurate is the metering on this relay?
It is extremely accurate. The RED670 boasts a measurement accuracy of better than 0.25% for currents and voltages, and better than 0.5% for power. This makes it suitable not just for protection, but also for high-precision revenue-grade metering applications if configured correctly.