General
A few seconds after the device is switched on, the default display appears on the LCD. In the 7UT6x the meas-
ured values are displayed.
The function parameters, i.e. function options, threshold values, etc., can be changed via the front panel of
the device, or via the operator or service interface from a personal computer using DIGSI. Password no. 5 (indi-
vidual parameters) is required. Operation via DIGSI is described in the /1/ SIPROTEC 4 System Manual.
In this general section, you make the basic decision for the correct interaction between your system, its meas-
uring points, the analog device connections and the protective functions of the device. Because of the
comprehensive range of features provided by the devices of the 7UT6x family, this section is quite extensive.
The device here acquires as complete as possible a profile of the system to be protected with its measuring
locations, i.e. the current and voltage transformers, and which protective functions of the device are to take
effect in what way.
In a first step (Section 2.1.3 Functional Scope), you specify which type of system element you want to protect,
since the scope of additional features offered varies depending on the type of main protected object. Then
you decide which protection functions you want to use, because not all of the functions integrated in the
device are necessary, useful or even possible for your relevant case of application.
In the next step (Section 2.1.4 Power System Data 1), you describe the topology of the protected object. i.e.
the arrangement of the protected object, its sides (windings for transformers, sides for generators/motors,
ends for lines, feeders for busbars), and the measuring locations which will provide the respective measured
values.
After entering some General Power System Data (frequency, phase sequence), you inform the device in
Section 2.1.4 Power System Data 1 of the properties of the main protected object. Object properties include
the ratings and (in the case of transformers) the starpoint treatment, vector group and, where applicable, the
auto-transformer winding.
Section 2.1.4 Power System Data 1 also deals with the CT data which must be set to ensure that the currents
acquired at the various measuring locations are evaluated in the device with the correct scale factor.
The above information is sufficient to describe the protected object to the device's main protection function,
i.e. the differential protection. For the other protection functions, you select in Section 2.1.6 Power System
Data 2 the measured values which will be processed by you and in which way.
The same section 2.1.6 Power System Data 2 provides information with regard to how to set the circuit
breaker data, and finding out about setting groups and how to use them. Last but not least, you can set
general data which are not dependent on any protection functions.
Device
Setting Notes
The parameters for the tripping logic of the entire device and the circuit breaker test have already been set in
Section 2.1.4 Power System Data 1 eingestellt.
Address 201 FltDisp.LED/LCD also decides whether the alarms that are allocated to local LEDs and the
spontaneous displays that appear on the local display after a fault should be displayed on every pickup of a
protection function (Target on PU) or whether they should be stored only when a tripping command is
given (Target on TRIP).
For devices with graphical display, use address 202 Spont. FltDisp. to specify whether or not a sponta-
neous annunciation will appear automatically on the display (YES) or not (NO). For devices with text display
such indications will appear after a system fault by any means.
In devices with text display, the start page of the basic display can be selected under address 204 Start
image DD.
2.1
2.1.1
2.1.1.1
Functions
2.1 General
28 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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