Siemens SIPROTEC 7SD610 Manual page 154

Functions
2.11 Undervoltage and Overvoltage Protection (optional)
Figure 2-56 Logic diagram of the overvoltage protection for phase voltage
Phase-to-phase overvoltage
The phase-to-phase overvoltage protection operates just like the phase-to-earth protection except that it
detects phase-to-phase voltages. Accordingly, phase-to-phase voltages which have exceeded one of the stage
thresholds Uph-ph> (address 3712) or Uph-ph>> (address 3714) are also indicated. Beyond this, Figure 2-
56 applies in principle.
The phase-to-phase overvoltage protection can also be blocked via a binary input „>Uph-ph>(>) BLK".
154
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011