ABB REM545 Machine Terminals

ABB REM545 Machine Terminals

DESCRIPTION

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.

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.

DESIGN

The machine terminals REM 543 and REM  545 differ from each other in the number of  digital inputs and outputs available. Please  refer to the section “Ordering” for more  details.  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

Protection functions

Protection is one of the most important functions of the REM 54_ machine terminal. The  protection function blocks are independent of  each other and have their own setting groups,  data recording, etc. Typical current-based protection functions  (e.g. overcurrent) can use either Rogowski  coil or conventional current transformer measurement. Correspondingly, voltage-based  functions (e.g. overvoltage) use either voltage  dividers or voltage transformers.

For further information about functionality  levels and the protection functions included  in them, refer to the table “Functionality levels, protection functions” in section “Ordering”.

Measurement functions

The measurement functions include threephase currents, neutral current, three-phase  voltages, residual voltage, frequency, active  and reactive power and power factor. An optional RTD/analogue module can be  used for measuring stator winding, bearing,  and ambient temperatures.

Disturbance recorder

The transient disturbance recorder is able to  record 16 current or voltage waveforms and  16 logic digital signals. The sampling frequency of the analogue inputs is 2 kHz at the  rated frequency of 50 Hz and 2.4 kHz at the  rated frequency of 60 Hz.The user can set the length of a recording  within a range determined by the number of  analogue inputs used. The number of recordings depends on the sampling frequency,  length of recordings and number of analogue  inputs.

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.