Page 8
REM 543 Protection,
Monitoring and Control
Technical Reference Manual
Part 1, General
ABB Network Partner
3.
Instructions
3.1.
Application
The REM 543 rotating machine terminals (referred to as "machine terminals" further
on) are designed to be used as a main protective system of generator and generator-
transformer units in small and medium-power diesel, hydroelectric and steam power
plants, among others. Protection of large and/or important MV synchronous and asyn-
chronous motors used e.g. in pumps, mills and crushers during start-up and normal run
forms another application area.
The functionality of REM 543 protection terminals is based on application-specific
libraries for protection, control, measurement, condition monitoring and communica-
tion. Each library includes a combination of specific function blocks, e.g. for protection.
Compared to the traditional use of separate products, the combination of libraries pro-
vides cost-effective solutions. Application-specific libraries together with the relay con-
figuration (IEC 1131 standard) allow the REM 543 protection terminals to be easily
adapted to different kinds of applications.
By means of the graphic MMI display, the control functions in the machine terminal
indicate the status of disconnectors or circuit breakers locally. Further, the machine ter-
minal allows status information from the circuit breakers and the disconnectors to be
transmitted to the remote control system. Controllable objects, such as CBs, can be
opened and closed over the remote control system. The status information and the con-
trol signals are transmitted over the serial bus. Local control is also possible via the
push-buttons on the front panel of the machine terminal.
The protection functions of REM 543 are designed for selective short-circuit and earth-
fault protection of rotating machines. Further, unlike most other power system compo-
nents, rotating machines also need protection against abnormal operating conditions
such as overcurrent, unbalanced load, overtemperature, overvoltage, underexcitation,
over- and underfrequency and generator motoring. Furthermore, stall protection and
cumulative start-up counter are provided for motor protection start-up supervision.
The REM 543 terminal measures three phase currents and three phase-to-phase volt-
ages, neutral current, residual voltage, frequency and power factors. Active and reactive
power is calculated from measured currents and voltages. Energy can be calculated on
the basis of the measured power. The measured values can be indicated locally and
remotely as scaled primary values.
In addition to protection, measurement, control and condition monitoring 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 inte-
grated into one unit. The data communication properties include SPA bus or LON®
*)
bus communication with higher-level equipment. Further, LON communication,
together with PLC functions, minimizes the need of hardwiring between the protection
terminals.
*) LON is a trademark of Echelon Corporation registered in the United States and other countries.
