K-WANG
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.
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