[logikdia-frequenzschutz, 1, en_GB]
Figure 2-108
Logic diagram of frequency protection
Setting Notes
General
The application of frequency protection is only possible in 3-phase protected objects. Furthermore, it is
required that the device is connected to a three-phase voltage transformer.
Frequency protection is only in effect and accessible if address 156 FREQUENCY Prot. was set to Enabled
during configuration of the protection function (Section 2.1.3 Functional Scope).
At address 5601 O/U FREQUENCY the frequency protection ON or OFF can be set. Furthermore, the command
can be blocked if the protective function is enabled (Block relay).
Pickup Values, Times
If the frequency protection is used for network splitting or load shedding, the setting values depend on the
system conditions. Normally, the objective is a graded load shedding that takes the priority of consumers or
consumer groups into account.
Other types of application are available in the power station sector. The frequency values to be set mainly
depend, also in these cases, on power system/power station operator specifications. In this context, frequency
decrease protection ensures the power station's own demand by disconnecting it from the power system on
time. The turbo regulator then regulates the machine set to nominal speed so that the station's own require-
ment can be continuously provided with rated frequency.
2.16.2
Functions
2.16 Frequency Protection
240 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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