3
Transformer Terminal RET 541, RET 543, RET 545
Features • Transformer terminal for protection, control,
measurement and supervision of two-wind-
ing power transformers and generator-
transformer blocks in distribution networks
• Designed to withstand harsh environments
e.g. in heavy industry, marine and offshore
applications
• Three-phase current differential protection
with stabilized and instantaneous stages
for fast and selective winding short-circuit
and interturn fault protection as main pro-
tection
• Fast and reliable operation even with satu-
rating CTs
• Numerical implementation of vector group
matching allows wye-connection of mea-
suring CTs as standard without interposing
CTs, irrespective of transformer vector
group
• Restricted earth-fault protection with the
conventional high impedance principle or
the stabilized numerical principle
• Three-phase overcurrent and earth-fault
back-up protection with definite time and
IDMT characteristics for both windings
• Thermal overload and negative phase
sequence protection
• Additional protection functions available in
the Multi –version terminal: overexcitation,
overvoltage, undervoltage, residual over-
voltage, directional overcurrent and earth-
fault, overfrequency, underfrequency and
underimpedance line back-up protection
• Large graphic display, either integrated or
as an external module
• Control functions including local and
remote control of switching objects, includ-
ing object status indication and interlock-
ings on bay and substation level
• Optional automatic on-load tap-changer
control function for single or parallel trans-
formers using the Master-Follower, Nega-
tive Reactance or Minimizing Circulating
Current principles
• Supports several methods to interface tap-
changer position information to differential
protection and voltage regulator
• Measurement of two sets of three-phase
currents, phase-to-phase or phase to neu-
tral voltages, neutral current, residual volt-
age, frequency, power factor, active and
reactive power and energy
• Condition monitoring including circuit-
breaker condition monitoring, trip circuit
supervision and internal self-supervision of
the transformer terminal
• Extensive set of integrated communication
protocols: SPA, LON, IEC 60870-5-103,
Modbus RTU/ASCII, DNP 3.0
• Interface to Profibus DP and IEC 61850
based systems via adapters
• Part of ABB’s substation automation sys-
tem
ret54_mimic_co180dpi
Fig. 1 Mimic view of RET 54_ transformer termi-
nal.
1MRS755543
Issued: February 2005
Status: Updated
Version: E/26.10.2010
Data subject to change without notice
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