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LED 5
FREQUENCY PROTECTION INDICATION
OSWGAPC16
OUT
IN_12
SELGAPC4
OUT_5
IN_17
OR
FRPFRQ1
f>/f<,df/dt (1)
81(1)
BLOCK
START
OPERATE
3U
FRPFRQ2
f>/f<,df/dt (2)
81(2)
BLOCK
START
OPERATE
3U
GUID-8E6B38BF-E8C6-4346-9EA4-F6A3DB231343 V1 EN
Figure 19:
Frequency protection
The selectable underfrequency or overfrequency protection FRPFRQ prevents
damage to network components under unwanted frequency conditions. The function
also contains a selectable rate of change of the frequency (gradient) protection to
detect an increase or decrease in the rapid changing power system frequency at an
early stage. This can be used as an early indication of a disturbance in the system.
The operate signals of these frequency protections are connected to the master trip and
to alarm LED 5.
Section 3
1MRS758335 B
REU611 standardized configuration
38
REU611
Application Manual