[logikdia-unterspgschutz-phasenspg-wlk-310702, 1, en_GB]
Figure 2-29
Logic diagram of the undervoltage protection for phase voltages
Phase-to-phase undervoltage
Basically, the phase-to-phase undervoltage protection operates like the phase-to-earth protection except that
it detects phase-to-phase voltages. Accordingly, both phases are indicated during pickup of an undervoltage
stage the value fell below one of the stage thresholds Uph-ph< (address 3762) or Uph-ph<< (address 3764).
Beyond this, Figure 2-29 applies in principle.
It is sufficient for the current criterion that current flow is detected in one of the involved phases.
Functions
2.5 Under and over-voltage protection (optional)
104 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
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