Setting Notes
General
In DIGSI double-click on Settings to display the relevant selection. A dialog box with the tabs Transformers,
Power System and Breaker will open under Power System Data 1 in which you can configure the indi-
vidual parameters. The following subsections are structured in the same way.
Current Transformer Polarity
In address 201 CT Starpoint, the polarity of the wye-connected current transformers is specified (the
following figure also goes for only two current transformers). The setting determines the measuring direction
of the device (forward = line direction). A change in this setting also results in a polarity reversal of the earth
current inputs Ι
E
.
[polung-stromwandler-020313-kn, 1, en_GB]
Figure 2-3 Polarity of current transformers
Nominal Values of the Transformers
In the addresses 203 Unom PRIMARY and 204 Unom SECONDARY the device obtains information on the
primary and secondary rated voltage (phase-to-phase voltage) of the voltage transformers; in addresses 205
CT PRIMARY and 206 CT SECONDARY the primary and secondary rated current transformers are set.
It is important to ensure that the secondary CT nominal current matches the rated current of the device, other-
wise the device will be blocked. The nominal current is set with jumpers on the measuring module (see
3.1.2 Hardware Modifications).
Correct entry of the primary data is a prerequisite for the correct computation of operational measured values
with primary magnitude. If the settings of the device are performed with primary values using DIGSI, these
primary data are an indispensable requirement for the correct function of the device.
Voltage Connection
The device features four voltage measuring inputs, three of which are connected to the set of voltage trans-
formers. Various possibilities exist for the fourth voltage input U
4
.
2.1.3.1
Functions
2.1 General
32 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
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