Functions
2.8 Frequency Protection 81 O/U
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
143
Figure 2-43 Logic diagram of the frequency protection
2.8.2 Setting Notes
General
Frequency protection is only in effect and accessible if address 154 81 O/U is set to Enabled during config-
uration of protective functions. If the fuction is not required Disabled is set. The function can be turned ON or
OFF under address 5401 FCT 81 O/U.
By setting the parameters 5421 to 5424, the function of each of the elements 81-1 PICKUP to 81-4 PICKUP
is set individually as overfrequency or underfrequency protection or set to OFF, if the element is not required.
Minimum voltage
The minimum voltage below which the frequency protecion is blocked is entered in address 5402 Vmin.
The threshold values is set as phase-to-phase quantity.
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