ABB RED670 1MRK004810-AC Line Differential Protection

Product Overview

The ABB RED670 is a premier solution for the protection, control, and monitoring of overhead lines and cables. The 1MRK004810-AC variant is specifically optimized for high-speed, phase-segregated line differential protection. It provides sub-cycle fault detection by comparing current values at both ends of a protected line via a dedicated communication link. 

Technical Specifications

• Series: Relion® 670.

• Part Number: 1MRK004810-AC.

• Application: Line Differential and Distance Protection.

• Main Functions: Phase-segregated differential, 5-zone distance protection, Autoreclosing.

• Communication: IEC 61850 Editions 1 & 2, DNP 3.0, IEC 60870-5-103.

• Redundancy: Supports HSR (High-availability Seamless Redundancy) and PRP.

• Time Sync: Supports IEEE 1588 PTP and IRIG-B.

• Hardware: 6U height, 1/2 x 19" chassis with fiber-optic LDCM (Line Data Communication Module).

Key Features and Engineering Advantages

• Phase-Segregated Differential Logic: Evaluates each phase independently, providing superior sensitivity for single-phase-to-ground faults.

• Integrated Distance Backup: Includes a full 5-zone distance protection scheme to ensure the line remains protected if the communication link fails.

• Communication Flexibility: Equipped with LDCM modules for direct fiber connection or multiplexed communication (C37.94).

• Charging Current Compensation: Advanced algorithms compensate for the capacitive charging current of long cables, preventing nuisance trips.

• Synchrocheck and Autoreclosing: Features built-in logic for multi-shot autoreclosing and synchronism verification to safely restore power after transient faults.

• High Performance: Sub-cycle operating times (typically <1.5 cycles) minimize system stress and equipment damage during faults.