ABB RET 54 Series Technical Reference Manual, General page 21

1MRS755225 Transformer Terminal
Technical Reference Manual, General
Fig. 4.1.-1 An application example of the integrated transformer terminal
RET 543 with basic functions.
While offering full protection with local and remote control in a cost-effective way,
the integrated terminal technology of the RET 541/543/545 units provides a wide
variety of control logic, measurement and condition monitoring functions, thus
minimizing the need for auxiliary relays and panel work.
The graphical configuration tool (based on the IEC 61131-3 standard) enables easy
creation of application-specific configurations and MIMIC pictures corresponding
to different switchgear systems. The process status is shown on a dynamic large
graphical display. Detailed information, for instance, measured values, events and
application-specific alarms, are presented in the display views.
RET 541/543/545 terminals can measure two sets of three phase currents, phase-to-
phase or phase-to-earth voltages, neutral current, residual voltage, frequency and
power factor. Active and reactive power is calculated from the 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.
With the condition monitoring functions, RET 54_ transformer terminal monitors
e.g. trip circuits, gas pressure of the breaker and breaker wear, and provides
scheduled time intervals for maintenance.
The RTD1 card, available as an option to the RET 541 and RET 543 terminals,
provides versatile analog inputs enabling e.g. tap position supervision of the on load
tap changer, RTD inputs for top and bottom oil temperature monitoring, and ambient
temperature biasing for accurate thermal overload protection. The mA outputs allow
transfer of any measurement data to PLCs.
RET 54_
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RET 54_
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