ABB REL561 1MRK002496-AC Distance protection terminal

ABB REL561 1MRK002496-AC Distance protection terminal

DESCRIPTION

The ABB REL561 1MRK002496-AC is a full-featured, technologically advanced line differential protection terminal and distance protection terminal, whose powerful protection and control functions make it an indispensable and important piece of equipment in power systems.

Main Protection Functions

Line differential protection

Phase-separated current differential: Measurement of the evaluated amplitude and phase angle, improved stability by means of a CT saturation detector, continuous compensation of transmission delays.

Transmission trip charging current compensation within the digital communication channel: master/master design for interface to multiplexed connections.

Line distance protection

Simultaneous measurement of different phase-to-phase impedances and phase-to-ground impedances within the digital measuring element.

Separate measurements for each fault type and each distance zone for fast and reliable fault detection.

Three-zone protection, completely individually set up, with excellent phase selection of additional series compensation networks.

Programme communication logic with current reversal and weak end feed-in logic.

Additional protection functions

In addition to line differential protection and distance protection, the ABB REL561 1MRK002496-AC has the following additional protection functions:

Phase overcurrent, residual current and voltage functions.

Circuit breaker fault protection, fuse failure and current transformer circuit monitoring.

Fast cross-zone communication of binary signals.

Single-pole or multi-pole trip function.

Control functions

Command control: including automatic reclosing and synchronisation check, where synchronisation check includes phase and energisation check.

Technical features

Differential current protection: allows comparison of currents entering and leaving a protected overhead line or cable and requires reliable communication facilities to allow exchange of information between terminals at each end of the line. This differential function provides phase isolation to provide true current differential protection for transmission, sub-transmission and distribution networks.

Digital systems: Used in modern digital communication systems, including multiplexing and routing switching systems. Current comparisons are made on a per-phase basis, avoiding the problems of current summation methods and providing phase selection information for unipolar tripping.

Current Differential Function: Using a master/slave design, each phase of current is evaluated separately at each end, utilising both current magnitude and phase angle (isolated vector comparison). All currents are Fourier filtered to extract sine and cosine components.

Data transmission: In a message transmitted every 5 ms to the remote terminal via a synchronised 56/64 kbit/s data channel. The information also includes differential function monitoring, CT saturation detection, terminal synchronisation and transmission of trip signals.

Fields of application

ABB REL561 1MRK002496-AC line differential protection terminals and distance protection terminals are widely used in line protection of power systems, especially in scenarios requiring high accuracy, fast response and reliable protection, such as high-voltage transmission lines and large substations.

Other Functions

In addition to the protection and control functions mentioned above, the ABB REL561 1MRK002496-AC may also be used as an intelligent gateway to provide customers with smooth upgrades of HMIs and other devices that need to communicate with the A-BPLC on a DD++ network but do not have a DDH+ interface. It may also be used as a turbine combustion engine protection system to provide comprehensive protection functions, such as overload protection, overspeed protection, low oil pressure protection, high water temperature protection, etc., to ensure the safe operation of the combustion engine under various operating conditions.

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