Functions
2.1 General
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
30
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 2.14 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.
Voltage Connection (Power System)
Address
213
specifies how the voltage transformers are connected.
VT Connect. 3ph
=
Van, Vbn, Vcn
means that the three phase voltages are wye connected, i.e. the three
phase-to-ground voltages are measured.
VT Connect. 3ph
=
Vab, Vbc, VGnd
means that two phase-to-phase voltages (open delta voltage) and
the displacement voltage V
GND
are connected.
VT Connect. 3ph
=
Vab, Vbc
means that two phase-to-phase voltages (open delta voltage) are connected.
The third voltage transformer of the device is not used.
VT Connect. 3ph
=
Vab, Vbc, Vx
means that two phase-to-phase voltages (open delta voltage) are con-
nected. Furthermore, any third voltage V
x
is connected that is used exclusively for the flexible protection func-
tions. The transformer nominal voltages for V
x
are set at address
232
and
233
.
VT Connect. 3ph
=
Vab, Vbc, VSyn
means that two phase-to-phase voltages (open delta voltage) and
the reference voltage for V
SYN
are connected. This setting is enabled if the synchronization function of the
device is used.
VT Connect. 3ph
=
Vph-g, VSyn
is used if the synchronization function of the device is used and only
phase-to-ground voltages are available for the protected object to be synchronized. One of these voltages is
connected to the first voltage transformer; the reference voltage V
SYN
is connected to the third voltage trans-
former.
The selection of the voltage transformer connection affects the operation of all device functions that require
voltage input.
