Setting Notes - Siemens SIPROTEC 4 Manual

[7sj6x_frequenzschutz-070906-he, 1, en_US]
Figure 2-51

Setting Notes

2.8.2
General
Frequency protection is only in effect and accessible if address 154 81 O/U is set to Enabled during configu-
ration of protective functions. If the function 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
Address 5402 Vmin is used to set the minimum voltage. Frequency protection is blocked as soon as the
minimum voltage is undershot.
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
Logic diagram of the frequency protection
Functions
2.8 Frequency Protection 81 O/U
139