Logic of the Advanced Stage
[lodiinva-280812-02.tif, 2, en_US]
Figure 7-113
Logic Diagram of the Directional Inverse-Time Overcurrent Protection, Ground – Advanced
Measurand (Basic and Advanced Stage)
The function uses the zero-sequence current (3I0) as a criterion for the ground fault.
Depending on the parameter setting connection type of the Measuring point I-3ph, the zero-sequence
current is measured or calculated. Depending on the applied CT terminal type, the 3I0 Threshold range
varies according to the following table.
Protection and Automation Functions
7.7 Directional Overcurrent Protection, Ground
720 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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