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Transformer TerminalRET 541, RET 543, RET 545

1MRS755543

Issued: February 2005Status: Updated ! Version: C/15.06.2005 ! Data subject to change without notice !

Features

Transformer terminal for protection, control, measurement and supervision of two-wind Optional automatic on-load tap-changer control function for single or parallel trans - - ing power transformers and generator-transformer blocks in distribution networks formers using the Master-Follower, Nega - tive Reactance or Minimizing Circulating Current principles Designed to withstand harsh environments e.g. in heavy industry, marine and offshore applications Supports several methods to interface tap-changer position information to differential protection and voltage regulator Three-phase current differential protection with stabilized and instantaneous stages for fast and selective winding short-circuit and interturn fault protection as main pro Measurement of two sets of three-phase currents, phase-to-phase or phase to neu - - tral voltages, neutral current, residual volt - tection age, frequency, power factor, active and reactive power and energy Fast and reliable operation even with satu - rating CTs Condition monitoring including circuit-breaker condition monitoring, trip circuit supervision and internal self-supervision of the transformer terminal Numerical implementation of vector group matching allows wye-connection of mea - suring CTs as standard without interposing CTs, irrespective of transformer vector group Extensive set of integrated communication protocols: SPA, LON, IEC 60870-5-103, Modbus RTU/ASCII, DNP 3.0 Restricted earth-fault protection with the conventional high impedance principle or the stabilized numerical principle Interface to Profibus DP and IEC 61850 based systems via adapters Three-phase overcurrent and earth-fault back-up protection with definite time and IDMT characteristics for both windings Part of ABB s substation automation sys - tem 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
ret54_mimic_co180dpi Fig. 1Mimic view of RET 54_ transformer termi - nal. 3