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Transformer TerminalRET 541, RET 543, RET 545

1MRS755543

Design

The transformer terminals RET 541, RET 543 and RET 545 differ from each other regarding the number of digital inputs and outputs available. Please, refer to section Ordering for more details. The control function blocks are documented on the CD-ROM Technical Descriptions of Functions (1MRS750889-MCD)
Condition monitoring functions The condition monitoring function blocks are documented on the CD-ROM Technical Descriptions of Functions (1MRS750889-MCD) The functions of the RET 54_ transformer terminal are categorized as: protection functions measurement functions
General functions Additional functions are available for differ - control functions ent 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. condition monitoring functions communication functions general functions standard functions
Communication functions The functions are further divided to three sub - The RET 54_ transformer terminal provides the IEC_103, Modbus, DNP 3.0, SPA and LON serial communication protocols. sets that correspond to different functionality levels, refer to section Ordering Informa - tion In a customer-specific transformer terminal configuration, special events can be gener
Protection functions - Protection is one of the most important func - ated via an EVENT230 event function. EVENT230 is documented on the CD-ROM Technical descriptions of Functions (1MRS750889-MCD). tions of the RET 54_ transformer terminal. The protection function blocks (e.g. NOC3Low) are independent of each other and have e.g. their own setting groups and data recording.
Standard functions Standard functions are used for logics, such as interlocking, alarming and control sequencing. The use of logic functions is not limited and the functions can be intercon The protection function blocks are docu - mented on the CD-ROM Technical Descrip - tions of Functions (1MRS750889-MCD) - nected with each other as well as with protec -
Measurement functions tion, measurement, power quality, control, condition monitoring and general functions. In addition, the digital inputs and outputs as well as LON inputs and outputs can be con The measurement function blocks are docu - mented on the CD-ROM Technical Descrip - tions of Functions (1MRS750889-MCD) - nected to standard functions by using the Relay Configuration Tool.
Control functions The control functions are used to indicate the position of switching devices, i.e. circuit breakers and disconnectors, and to execute open and close commands for controllable switching devices in the switchgear. Further The standard function blocks are documented on the CD-ROM Technical descriptions of Functions (1MRS750889-MCD). - more, there are supplementary functions for control logic purposes, e.g. on/off switches, MIMIC alarm, LED control, numerical data for the MIMIC and logic controlled position selection.
Other functions Low auxiliary voltage indication The RET 54_ transformer terminal is pro - vided with a low auxiliary voltage indication feature. The power supply module issues an internal alarm signal when a drop in the power supply voltage is detected (ACFail, active low). The alarm signal is activated if the power supply voltage falls about 10% below the lowest rated DC input voltage of the power supply module. The control functions configured using the Relay Configuration Tool can be associated with position indicators that are part of the MIMIC configuration picture displayed on the HMI. Position indicators are used to indi - cate the position of switching devices via the MIMIC picture and to control them locally.
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