In the following, typical applications are described for the restricted ground-fault protection.
Protection of a Solidly Grounded Star Winding (Y Side)
[dwanster-170712-01.tif, 1, en_US]
Figure 6-271 Application Star Side
This application is a standard application. Here the phase currents of one side and the neutral-point current
are processed. The function is located in the Transformer Side function group.
The following figure show the structural division of the function. The restricted ground-fault protection gets
its measurands from the current transformers, which are connected to the Transformer side function group.
The neutral-point current is guided via the Transformer neutral point function group to the Transformer
side function group. To be compatible with SIPROTEC 4 (including reference arrow definition of the restricted
ground-fault protection), in addition to the magnitude scaling of the neutral-point current, a rotation of the
polarity (phase rotation by 180°) is also done in the Transformer neutral point function group.
NOTE
The fault record indicates the analog traces according to the connection. For this reason, the neutral-point
current is shown rotated by 180° in comparison to SIPROTEC 4.
[dw2wtyde-201112-01.tif, 2, en_US]
Figure 6-272 Function Group Structure of the Restricted Ground-Fault Protection
Protection and Automation Functions
6.43 Restricted Ground-Fault Protection
SIPROTEC 5, Overcurrent Protection, Manual 869
C53000-G5040-C017-8, Edition 07.2017
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