Siemens SIPROTEC 7SK80 - Page 212

Functions
2.13 Flexible Protection Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
212
Note
With regard to the phase-selective pickup messages, a special behavior is observed in the three-phase voltage
protection with phase-to-phase variables, because the phase-selective pickup message "Flx01 Pickup Lx" is
allocated to the respective measured-value channel "Lx".
Single-phase faults:
If, for example, voltage V
A
drops to such degree that voltages V
AB
and V
CA
exceed their threshold values, the
device indicates pickups “Flx01 Pickup A” and “Flx01 Pickup C”, because the undershooting was detected in
the first and third measured-value channel.
Two-phase faults:
If, for example, voltage V
AB
drops to such degree that its threshold value is reached, the device then indicates
pickup "Flx01 Pickup A", because the undershooting was detected in the first measured-value channel.