Setting Notes - Siemens 7SC80 Manual

Functions
2.30 Additional Applications with 6 Voltage Inputs
[lo_frequency_Side2, 1, en_US]
Figure 2-146
2.30.3.2

Setting Notes

General
Frequency protection of side 2 is only in effect and accessible when 6PT is in use and the address 156 81 O/U
S2 is set to Enabled during the configuration of protective functions. If the function is not required, Disa-
bled is set. The function can be turned ON or OFF under address 5901 FCT 81 O/U S2.
By setting the parameters 5903 to 5906, the function of each of the elements 81-1 PICKUP S2 to 81-4
PICKUP S2 is set individually as overfrequency or underfrequency protection or set to OFF, if the element is
not required.
Minimum Voltage
Address 5902 Vmin S2 is used to set the minimum voltage of side 2. The frequency protection of side 2 is
blocked as soon as the minimum voltage is undershot.
For all three-phase connections, the threshold must be set as a phase-to-phase value.
Pickup Values
The setting as overfrequency or underfrequency element does not depend on the parameter threshold values
of the respective element. An element can also function, for example, as an overfrequency element if its
threshold value is set below the nominal frequency and vice versa.
440
Logic diagram of the frequency protection of side 2
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017