4.6 Frequency protection
4.6.1 Frequency protection FRPFRQ
4.6.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Frequency protection FRPFRQ f>/f<, df/dt 81O/81U, 81R
4.6.1.2 Function block
GUID-744529D8-E976-4AFD-AA77-85D6ED2C3B70 V1 EN
Figure 260: Function block
4.6.1.3 Functionality
The frequency protection FRPFRQ is used to protect network components against
abnormal frequency conditions.
The function provides basic overfrequency, underfrequency and frequency rate-of-
change protection. Additionally, it is possible to use combined criteria to achieve
even more sophisticated protection schemes for the system.
The function contains a blocking functionality. It is possible to block function
outputs, timer or the function itself, if desired.
4.6.1.4 Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of the frequency protection function can be described using a
module diagram. All the modules in the diagram are explained in the next sections.
Section 4 1YHT530004D05 D
Protection functions
494 615 series
Technical Manual
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