Description

Technical Specifications

• Product Model: ABB REL561 1MRK002496-AC
• Brand: ABB
• Warranty: One Year Full Coverage Warranty
• Working Voltage: 24–250V DC / 100–240V AC Universal Auxiliary Supply
• Working Temperature: -40°C to 70°C
• Storage Condition: -50°C to 85°C, Non-condensing Humidity
• Interface Type: Terminal blocks, optical communication port, IEC 60870-5-103, SPA bus, IEC 61850
• Anti-interference Level: Industrial EMC Anti-interference Standard

Product Overview

The ABB REL561 1MRK002496-AC line differential and distance protection IED belongs to ABB legacy 500-series ProtectIT family. It is designed for high-voltage and extra-high-voltage transmission lines, integrating phase-segregated current differential protection and multi-segment distance protection as primary protection. It supports two-terminal line differential protection with automatic communication delay compensation and CT saturation detection, suitable for series-compensated lines and HVDC adjacent circuits. Additional protection functions include directional overcurrent, earth fault, over/under voltage, over/under frequency, breaker failure backup protection and single/three-pole auto-reclosing. Equipped with local MMI, disturbance recording, event logging and high-precision measurement functions. Built for continuous reliable operation in transmission substations, this unit addresses protection failure and grid safety risks caused by aging or damaged original relays. Manufactured to strict power industry standards and fully tested, it serves as a dependable replacement spare part for transmission line protection system maintenance and fault repair.

Core Application Advantages

• Low Failure Rate Operation: Constructed with industrial-grade materials and circuitry, delivering strong stability and durability to cut recurring maintenance expenses.
• Fast Fault Recovery: Standard rack-mounted design enables quick installation and removal. Engineers can finish system repairs rapidly to minimize power outage losses.
• Wide System Compatibility: Fully compatible with original ABB 500-series line protection architecture. Supports multiple communication protocols for SCADA connection, no complex program adjustments needed after installation, bringing zero adaptation cost.

Typical Application Cases

• Industrial System Emergency Maintenance: Emergency replacement of faulty line differential and distance protection relays in EHV/HV transmission substations to restore high-speed line protection rapidly.
• Long-term Spare Part Reserve: Kept as regular inventory for power grid transmission substations, easing procurement bottlenecks and long lead times of original imported spare parts.
• Automation System Upgrade: Matches legacy transmission protection cabinets during power grid reconstruction and substation retrofitting projects.