Section 8 Frequency protection
8.1 Underfrequency protection SAPTUF
8.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Underfrequency protection SAPTUF
SYMBOL-P V1 EN
81
8.1.2 Functionality
Underfrequency occurs as a result of a lack of sufficient generation in the network.
Underfrequency protection SAPTUF measures frequency with high accuracy, and is
used for load shedding systems, remedial action schemes, gas turbine startup and so
on. Separate definite time delays are provided for operate and restore.
SAPTUF is provided with undervoltage blocking.
8.1.3 Function block
SAPTUF
U3P*
BLOCK
TRIP
START
RESTORE
BLKDMAGN
IEC09000282_1_en.vsd
IEC09000282 V1 EN
Figure 78: SAPTUF function block
1MRK 511 287-UEN A Section 8
Frequency protection
179
Technical manual
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