Siemens SIPROTEC 4 7UT6 Series Manual page 56

Functions
2.1 General
[phasenfolge-020904-rei, 1, en_GB]
Figure 2-10
Temperature Unit
The temperature of the hot-spot temperature calculation can be displayed in Celsius or Fahrenheit. This
applies in particular for the output of the hot-spot temperature if you are using the overload protection with
hot-spot calculation. Set the desired temperature unit in address 276 TEMP. UNIT. Changing temperature
units does not mean that setting values which are linked to these temperature units will automatically be
converted. They have to be re-entered into their corresponding valid addresses.
Object Data with Transformers
Transformer data are required if the device is used for differential protection for transformers, i.e. if the
following was set with the configuration of the protection functions (functional scope) under address 105
PROT. OBJECT = 3 phase transf. or 1 phase transf. or Autotr. node. In cases other than that,
these settings are not available.
Please observe the definition of the sides which you have performed during setting of the topology of the
main protected object (see Determining the Topology). Generally, side 1 is the reference winding having a
current phase angle of 0° and no vector group indicator. Usually this is the higher voltage winding of the
transformer.
The object data contain information about each of the sides of the protected object as defined in the topology
statements. No data of the sides which are not assigned are requested here. They will be entered at a later
date (margin heading "Object Data for Further Protected Objects").
For side 1 the device needs the following information:
•
The primary rated voltage U
•
The primary rated apparent power under address 312 SN SIDE 1. Note that the power ratings of the
windings of power transformers with more than 2 windings may differ. Here, the rating of the winding
assigned to side 1 is decisive. The power must always be entered as a primary value, even if the device is
generally configured in secondary values. The device calculates the rated current of the protected
winding from this power.
•
The starpoint condition under address 313 STARPNT SIDE 1: Earthed or Isolated. If the starpoint is
earthed via a current-limiting circuit (e.g. low-resistive) or via a Petersen-coil (high-reactive), set
Earthed, too. The starpoint is also treated as Earthed if a starpoint former (neutral earthing reactor) is
installed within the protected zone of the winding.
•
The mode of interconnection of the transformer windings under address 314 CONNECTION S1. If side 1
is that of the high-voltage side of the transformer, this is normally the capital letter of the vector group
according to IEC (Y or D). For auto-transformers and single-phase transformers, only Y is permitted.
If the transformer winding is regulated, not the actual rated voltage of the winding U
voltage which corresponds to the average current of the regulated range.
[anlagendaten-nennspannung-020904-rei, 1, en_GB]
56
Phase rotation
in kV (phase-to-phase) under address 311 UN-PRI SIDE 1.
N
is used, but rather the
N
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016