ABB REX521GHHPLH50G Feeder protection relay

Protection functions

The IED offers directional and non-directional overcurrent and thermal overload protection as

well as directional and non-directional earth-fault protection. 

Some standard configurations allow as an option admittance-based, harmonics-based

or wattmetric-based earth-fault protection to be used in addition to directional earth-fault

protection. Further, the IED features sensitive earth-fault protection, phase discontinuity

protection, transient/intermittent earth-fault protection, overvoltage and undervoltage

protection, residual overvoltage protection, positive-sequence undervoltage and negativesequence overvoltage protection.

Frequency protection, including overfrequency,underfrequency and frequency rate-of-change

protection, is offered in IEDs with standard configurations H and J. 

The IED also incorporates optional three-pole multi-shot auto-reclose

functions for overhead line feeders.

Enhanced with optional hardware and software, the IED also features three light detection

channels for arc fault protection of the circuitbreaker, busbar and cable compartment of metalenclosed indoor switchgear.

The arc-fault protection sensor interface is available on the optional communication module.

Fast tripping increases staff safety and security and limits material damage in an arc fault situation

Technical Description

Functional description

Functions of the machine terminal

The functions of REM 54_ machine terminal are categorized as:

• protection functions

• measurement functions

• control functions

• condition monitoring functions

• communication functions

• general functions

• standard functions

The functions are further divided to two subsets that correspond to different functionality levels.

The 610 series protection relays are suitable for employment in marine and offshore environments.

The numerical voltage protection relays of the 610 series support a wide range of standard communication protocols,

among them the IEC 61850, IEC 60870-5-103, DNP3, Modbus,Profibus, LON and SPA communication protocols.

The REM 545 machine terminals are used as the main protection system of generator and generator-transformer 

units in small and medium-power diesel, hydroelectric and steam power plants. 

The protection for large and/or important MV synchronous and asynchronous motors used, 

for example, in pumps, mills and crushers during start-up and normal run forms another application area.

The protection functions of REM 545 are designed for selective short-circuit and earth-fault protection of rotating machines. 

Unlike most other power system components, rotating machines also need protection against abnormal 

operating conditions such as over-current, unbalanced load, over-temperature, over-voltage, over and under-excitation, 

under-impedance, over- and under-frequency and generator motoring. 

For motor protection start-up supervision, there are also stall protection and cumulative start-up counter features.

Further, the protection relay can be used for undervoltage protection of motors and overvoltage protection of capacitor

batteries, for initialization of automatic busbar changeover and disconnecting small power units from the network in case of a major network disturbance. 

Relay Retrofit Program for REX 521 Product Guide 1MRS758962

Relay Retrofit Program for REX 521 Installation Manual 1MRS758961

Relay Retrofit Program for REX 521 Application Manual 1MRS758960

Relay Retrofit Program for REX 521 Cutting Tool Safety Guide 1MRS758975

Relay Retrofit Program for REX 521 Cutting Tool Operating Guide 1MRS758976

ABB IOR810 S800 I/O Gateway Module (For HN800)

ABB IOR810A S800 I/O Gateway Module (For HN800)

ABB IOR810K02 S800 I/O Gateway Kit, Redundant

ABB PDP800A Profibus DP V0/V1/V2 Master Module

ABB PIO800K02 Profibus I/O Interface Kit [Redundant]

ABB PIO800K02A Profibus I/O Interface Kit [Redundant]

ABB PTU810 PDP800 Module Mounting Base

ABB PTU810A PDP800A Module Mounting Base

ABB RFO810 HN800/CW800 Fiber Optic Repeater Module

ABB RFO810A HN800/CW800 Fiber Optic Repeater Module

ABB IOR810K02A S800 I/O Gateway Kit, Redundant