[lo-esd-anr-20101116, 2, en_US]
Figure 2-14
Ground fault differential protection pickup, isolated/resonant-grounded system
If only the V0 voltage is connected, only parameter 1226 87N L: 3V0> is effective. The threshold checks
87N L:Vph-g min and 87N L:Vph-g max (parameter 1227 and 1228) are not relevant.
You will find the logic diagram for the differential protection trip in Section 2.2.5 Differential Protection Pickup
Logic and Tripping Logic.
Functions
2.2 Phase Comparison Protection and Ground Differential Protection
60 SIPROTEC 4, 7SD80, Manual
E50417-G1100-C474-A2, Edition 02.2018
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