Description

 ABB REL551 1MRK002480-AE

It is a feeder protection relay produced by ABB and belongs to the 650 series of its famous RELION® product series.

 

1. Core Product Overview

• Product Name: REL551 Line Differential Protection Relay

• Product Series: RELION® 650 Series

• Manufacturer: ABB

• Order Number / Model: 1MRK002 480-AE

• Primary Function: A full-scheme current differential protection relay designed for medium-voltage distribution networks (typically 10kV to 40.5kV). It is primarily used to protect cable feeders, overhead lines, and mixed cable-overhead lines.

2. Key Functions and Protection Features

The core of the REL551 is current differential protection, one of the most sensitive, fastest, and selective principles for protecting a line. In addition, it integrates multiple protection and control functions:

• Main Protection:

  • Three-Stage Phase and Earth-Fault Current Differential Protection: Provides high-precision unit protection for the line, which is the core function of the product.

  • Differential High-Set Current Protection: Used to clear severe internal faults, providing backup protection.

• Backup Protection:

  • Four-Stage Directional Overcurrent Protection (Phase and Earth): Provides comprehensive stepped backup protection.

  • Two-Stage Voltage Protection (Overvoltage and Undervoltage).

  • Frequency Protection (Overfrequency and Underfrequency).

  • Breaker Failure Protection.

  • Autorecloser: Supports multiple reclosing sequences, suitable for overhead lines.

  • Fuse Failure Monitoring (VT Supervision).

• Control and Measurement:

  • Circuit Breaker Control: Local and remote opening/closing.

  • Measurement Functions: Real-time monitoring of current, voltage, power, power factor, frequency, energy, etc.

  • Disturbance Recording (Fault Recorder): Records current and voltage waveforms before and after a fault for event analysis.

  • Event Recording: Logs all operations, alarms, and status changes.

• Communication Features:

  • Supports multiple standard communication protocols, such as IEC 61850 (Station and Process Level GOOSE/SV), IEC 60870-5-103/104, Modbus, DNP3.0, etc., enabling seamless integration into digital substations and automation systems.

  • Features time synchronization capabilities, supporting IRIG-B, SNTP, etc., which is crucial for synchronizing the two ends of the differential protection system.

3. Technical Characteristics

• Unit Protection & High-Speed Operation: Operates only for internal faults within the protected zone with very fast operating times (typically within 20-30 ms), minimizing impact on system stability.

• High Reliability: Adopts an integrated main and backup protection design, where a single device provides a complete line protection solution.

• High Selectivity: Accurately distinguishes between internal and external faults, preventing unnecessary outages.

• Robust Communication Capabilities: Fundamental for implementing current differential protection, requiring a reliable high-speed communication channel (e.g., fiber optic) between the relays at both line ends.

• User-Friendly: Features a large graphical LCD display with a clear menu structure for easy on-site configuration and commissioning.

4. Typical Applications

The REL551 is widely used in power lines requiring high-reliability protection, such as:

• Industrial Power Networks: Internal supply feeders for industries like petrochemical, steel, and data centers.

• Urban Distribution Networks: Critical tie-lines or feeders between ring main units and distribution substations.

• Renewable Energy Plants: Collector lines in wind farms and photovoltaic power stations.

• Railway Traction Power Supply Systems.

• Any application requiring fast, selective, and sensitive line protection.

 

 

Sales of the brand:

ABB、EPRO、GE、FOXBORO、Schneider、Rexroth、Honeywell、Bently、YASKAWA other global DCS system and PLC system, servo system of famous industrial brand.

☀️Tara(Sales Director)

📞Tel: + 86-13806028623

📮Whatsapp:+86-13806028623

💬Email: ydf8801@163.com

🏚️Ship to you via DHL/TNT/UPS/EMS/Fedex

🥇Product Condition: One-year warranty

 

requently Asked Questions:
1. How long does it take to receive the goods?
We have stock in stock and can accept same-day payment and delivery!

2. What payment methods do you accept?
There are many methods (T/T…) for you to choose from, and you can choose whatever you want.

3. Is there after-sales service?
 they have a one-year warranty!

4. What courier services do you accept? We offer SF Express, DHL, and other international express delivery options.

5. How can I contact you?

You can contact me 24/7 via WeChat, Skype, WhatsApp, LINE, and my email!

 

Company Profile

Xingchuang Ronghe (Fuzhou) Electric Co., Ltd. is a company specializing in the sales and technical services of spare parts for the world’s top industrial automation systems. With our profound industry experience and stable supply channels, we provide domestic and foreign customers with original, authentic, complete models, and fast-delivered precision spare parts solutions. We are your reliable partner in ensuring production continuity and stability.

We specialize in distributing the following core brands and product lines:

ABB

•  Process Control: ABB DCS process control system full range of components.
• ABB FreeLance AC800F power modules: SA801F/SA811F/SD802F/SD812F, EI811F/ABB EI812F/ABB EI813F, etc.
• ABB S800 analog I/O modules: AI801/AI810/AI825/AO801/AO845/AO895
• ABB S800 digital I/O modules: DI801/DI810/DO801/DO810

Bently Nevada
3500 Module Mainboards: 3500/42, 3500/45, 3500/40, 3500/50, etc.
(CPU Modules): 3200/32, 3500/25
3500 Module Minimum Cards: 128229-01, 128229-01, 133442-01, 125800-01, 167699-02, etc.
Extension Cables: 330850-50-05 (for preamplifier), 330730-040-00-00, 330103-00-06-10-02-00, etc.

EPRO

•  MMS6000 TSI System: MMS6110/MMS6210/MMS6220 series monitoring modules.
  Sensors: Proximitor sensors CON011, CON021, CON031, etc

GE

• PLC Systems: IC693, IC695, and IC697 Series Modules.
• Drives and Protection: GE DRIVE SYSTEMS Series Inverters, SR Integrated Protection Frame Series.

Rexroth

• Drives and Motors: Full range of Rexroth servo drives and controllers; models include: servo motor 2AD160B-B0350R2-BS03-D2V1, MSK040C-0600-NN-M1-UP1-NSNN, etc.
• Rexroth communication boards and amplifier boards: MTS-P01.2-D2-B1-E1-NN-NN-FWEP, VT-VPCD-1-1X/V0/1-0-1, VT5006-17B, etc.

Siemens

· Process Instruments and Controllers: Siemens MOORE series, common models include: QLCDM024DCBAN, 39ACM24BEN, 39AC12T4V1, 16114-171, etc.
· Automation Systems: Full range of SIMATIC S5 PLCs, SIMATIC S7-400 CPU modules and expansion modules, Simatic C7 systems, and various Siemens touch screens.