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2.1.3
Power System Data 1
2.1.3.1 Description
The device requires certain data regarding the network and substation so that it can adapt its functions to this
data depending on the application. This may be, for instance, nominal data of the substation and measuring
transformers, polarity and connection of the measured quantities, breaker properties (where applicable), etc.
There are also certain parameters that are common to all functions, i.e. not associated with a specific protec-
tion, control or monitoring function. The following section discusses this data.
2.1.3.2 Setting Notes
General
Some P.System Data 1 can be entered directly at the device. See section 2.22 for more information regard-
ing this topic.
In DIGSI double-click Settings to open the corresponding dialog box. In doing so, a dialog box with tabs will
open under P.System Data 1 where individual parameters can be configured. The following descriptions
are therefore structured according to these tabs.
Nominal Frequency (Power System)
The nominal frequency of the system is set under the Address 214 Rated Frequency. The factory pre-setting
in accordance with the model need only be changed if the device will be employed for a purpose other than
that which was planned when ordering. In the US device versions (ordering data position 10= C), parameter
214 is preset to 60 Hz.
Phase Rotation (Power System)
Address 209 PHASE SEQ. is used to change the default phase sequence (A B C for clockwise rotation) if your
power system permanently has an anti-clockwise phase sequence (A C B). A temporary reversal of rotation
is also possible using binary inputs (see Section 2.18.2).
Temperature Unit (Power System )
Address 276 TEMP. UNIT allows displaying the temperature values either in degrees Celsius or in degrees
Fahrenheit.
Polarity of Current Transformers (Power System )
At address 201 CT Starpoint, the polarity of the wye-connected current transformers is specified (the fol-
lowing figure applies accordingly to two current transformers). This setting determines the measuring direction
of the device (forward = line direction). Changing this parameter also results in a polarity reversal of the ground
current inputs I
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
or I
.
N
NS
Functions
2.1 General
39
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