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4.5.1.2
Function block
Figure 221: Function block
4.5.1.3
Functionality
The frequency protection function 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.
4.5.1.4
Operation principle
The function can be enabled and disabled with the
Operation setting. The
corresponding parameter values are "On" and "Off".
The operation of FRPFRQ can be described using a module diagram. All the modules
in the diagram are explained in the next sections.
F
BLOCK
Operate
logic
Freq>/<
detection
df/dt
detection
Blocking
logic
START
ST_FRG
ST_UFRQ
ST_OFRQ
OPERATE
OPR_FRG
OPR_UFRQ
OPR_OFRQ
dF/dt
Figure 222: Functional module diagram
Freq>/< detection
The frequency detection module includes an overfrequency or underfrequency
detection based on the
Operation mode setting.
1MRS758755 C
Protection functions
REC615 & RER615
Technical Manual
449
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