[7sc80-unterspgs-schutz-1ph-20110601, 1, en_US]
Figure 2-56
Logic diagram for single-phase undervoltage protection
Setting Notes
General
The single-phase voltage protection via Vx is set at address 370 27/59 Vx = Enabled. If this function is not
required, select Disabled.
Overvoltage protection can be switched ON or OFF, or set to Alarm Only at address 390 59 Vx.
Undervoltage protection can be switched ON or OFF, or set to Alarm Only at address 380 27 Vx.
If the protection function is ON, tripping, trip log and fault recording will occur when limit values have been
exceeded and after time delays have expired.
When setting Alarm Only, no trip command is given, no trip log is initiated, and no spontaneous fault indi-
cation is issued in the Web Monitor.
Overvoltage Protection
Overvoltage protection includes two elements.
You can set the pickup thresholds at the following addresses:
59-1 Vx Pickup
Address 391
59-2 Vx Pickup
Address 392
The times for tripping delay are set at the following addresses:
59-1 Vx Delay
Address 393
59-2 Vx Delay
Address 394
2.8.2
Functions
2.8 27/59 Under/Over Voltage for Vx
SIPROTEC Compact, 7SC80, Manual 205
E50417-G1140-C486-A8, Edition 07.2017
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