ABB 1MRS751173-MBG Machine Terminals

ABB 1MRS751173-MBG Machine Terminals

Features

• Integrated machine terminals for the protection, control, measurement and supervision of small and medium size generators,  synchronous motors and large asynchronous motors. 

• Voltage and current measurement via conventional measuring transformers or current sensors and voltage dividers. 

• Fixed man-machine interface including a  large graphic display, or an external display  module for flexible swichgear installation. 

• Extended functionality including protection, control, measurement, condition monitoring and communication. 

• Non-directional/directional overcurrent/earth-fault protection functions, over- /undervoltage protection functions and special functions for the protection of motors  and generators, e.g. voltage controlled  overcurrent protection, differential protection with several principles, underexcitation  protection, underimpedance protection  (line back-up prot.), thermal overload protection, protection against unbalanced  load, abnormal frequency protection,  reverse or low-forward power protection  and start-up supervision for motors.

• Control functions including local and  remote control of switching objects with  synchro-check, status indication of the  switching objects and interlockings on bay  and station level. 

• Measurement of phase currents, phase-tophase and phase-to-neutral voltages, neutral current and residual voltage, frequency,  power factor, active and reactive power  and energy. 

• Optional RTD/mA I/O-module for stator  winding, bearing and ambient temperature  monitoring. Analog mA outputs for interfacing with process control system. 

• Condition monitoring including circuitbreaker condition monitoring, trip circuit  supervision and internal self-supervision of  the machine terminal. 

• Communication over three communication  interfaces: one for local communication  with a PC and the others for remote communication with a substation control system or with a substation monitoring system. 

• Part of the ABB’s Distribution Automation  system.

Application

The REM 543 and REM 545 rotating machine terminals are designed to be used as an  integrated main protection system of generator and generator-transformer units in small  and medium-power diesel, hydroelectric and  steam power plants, etc. The protection of  large and/or important MV synchronous and  asynchronous motors used e.g. in pumps,  fans, mills and crushers during start-up and  normal run forms another application area.  The REM 54_ machine terminals as integrated packages make possible compact  marine environment solutions for unit protection, too.

In addition to protection, measurement, control and condition monitoring and general  functions, the machine terminals are provided  with a large amount of PLC functions allowing several automation and sequence logic  functions needed for substation automation to  be integrated into one unit. The data communication properties include SPA bus, LON  bus or MODBUS communication with  higher-level equipment. Further, LON interbay communication, together with PLC functions, minimizes the need for hardwiring  between the machine terminals.

The REM 54_ machine terminals incorporate  a wide range of functions:

• Protection functions 

• Measurement functions 

• Control functions 

• Condition monitoring functions 

• General functions 

• Communication functions 

• Standard functions

Control functions

The control functions are used to indicate the  status of switching devices, i.e. circuit breakers and disconnectors, and to execute open  and close commands for controllable switching devices of the switchgear. Furthermore,  control functions provide on/off switching  objects for control logic purposes and miscellaneous objects for data monitoring, etc.

The control functions configured with the  Relay Configuration Tool must be linked to  object status indicators included in the  MIMIC configuration picture displayed on  the HMI. The object status indicators are used  to indicate the status of switching devices via  the MIMIC picture and to control them  locally.

Condition monitoring functions

Condition monitoring function blocks such as  supervision of the energizing current and  voltage input circuit, operation time counter,  circuit-breaker electric wear, scheduled maintenance, trip circuit supervision and breaker  travel time are available for the REM 54_  machine terminals.

General functions

Additional functions are available for different general purposes to be used in logics such  as activation of HMI backlight, switchgroups,  and resetting of operation indications, latched  output signals, registers and disturbance  recorder.