Description
Product Introduction
⚡ Product: REL561
🏷️ Order Number: 1MRK002496-AC
🔧 Brand: ABB
🛡️ Product Type: Line Protection Terminal
The ABB REL561 1MRK002496-AC is a microprocessor-based line protection terminal designed for high-voltage and extra-high-voltage transmission applications. It combines line differential protection with distance and other protection functions, along with measurement, disturbance recording, control, and communication capabilities.
🔍 The REL561 is intended for protection of overhead and cable transmission lines. Its differential protection compares current information from the line terminals, while additional protection functions can provide backup protection when required. The exact available functions depend on the configured hardware and application.
🏭 It can be used in transmission substations, power-generation networks, industrial power systems, and other installations requiring dedicated line protection. Before replacement, verify the complete ordering code, hardware configuration, CT/VT ratings, communication interfaces, and protection settings.
Product Datasheet
🔹 Model: REL561
🔹 Order Number: 1MRK002496-AC
🔹 Brand: ABB
🔹 Product Family: ABB Relion / Protection Terminal
🔹 Product Type: Line Protection Terminal
🔹 Primary Function: Line Differential Protection
🔹 Additional Protection: Distance, Overcurrent, Earth-Fault and Configuration-Dependent Functions
🔹 Application: HV / EHV Transmission Lines
🔹 Communication: Digital Protection Communication, Configuration Dependent
🔹 Data Synchronization: Digital Communication Channel
🔹 Protection Configuration: Programmable / Application Dependent
🔹 Mounting: Protection Panel / Substation Cabinet
🔹 Dimensions: Configuration dependent*
🔹 Weight: Approx. 11.5 kg*
🔹 Country of Origin: Sweden / Europe*
*Exact dimensions, weight, I/O configuration, communication interfaces, auxiliary supply, and protection functions depend on the hardware configuration. Available references identify 1MRK002496-AC specifically as an ABB REL561 protection terminal.
Typical Applications
⚡ High-voltage transmission line protection
🔌 Extra-high-voltage substations
🏭 Industrial power networks
🛡️ Line differential protection
📊 Distance and backup protection
🔄 Overhead and cable line protection
⚙️ Substation automation and monitoring
Installation & Use
🛠️ Before installation, verify the REL561 ordering code, hardware revision, CT/VT ratios, auxiliary power supply, communication equipment, and existing protection configuration.
🔌 Isolate the relevant electrical circuit before installation. Check CT polarity, VT wiring, trip circuits, binary inputs, communication channels, and grounding connections against the approved protection drawings.
💻 During commissioning, verify protection settings and communication parameters using the appropriate ABB engineering tools. Confirm line differential communication, distance protection, event recording, measurements, alarms, and trip outputs.
📊 Perform secondary-injection and end-to-end protection testing where required. Verify that both line terminals exchange the correct protection data and that the trip logic operates as designed.
⚠️ Protection settings are specific to the protected line and system study. Do not transfer settings from another REL561 installation without engineering review and approval.
