Logic of the Stage
[lonspdir-300112-01.tif, 1, en_US]
Figure 6-158
Logic Diagram of the Function Directional Negative-Sequence System Protection with Current-
Independen Time Delay
Measurand
The negative-sequence current I2 is used as a measurand. From the 3-phase currents, the fundamental
phasors are determined via a 1-cycle filter and, corresponding with the definition equation of the symmetrical
components, the negative-sequence system is calculated from this.
Protection and Automation Functions
6.18 Directional Negative-Sequence Protection
644 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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