Section 10 Frequency Protection; Underfrequency Protection Saptuf; Identification; Functionality - ABB RET650 Technical Manual
Relion 650 series
transformer protection
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- Applications manual (392 pages) ,
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1MRK 504 135-UEN A
Section 10
10.1
10.1.1
10.1.2
10.1.3
Technical manual
Frequency protection
Underfrequency protection SAPTUF
Identification
Function description
Underfrequency protection
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.
Function block
SAPTUF
U3P*
TRIP
BLOCK
START
RESTORE
BLKDMAGN
IEC09000282_1_en.vsd
IEC09000282 V1 EN
Figure 102:
SAPTUF function block
Frequency protection
IEC 61850
IEC 60617
identification
identification
SAPTUF
f <
SYMBOL-P V1 EN
Section 10
ANSI/IEEE C37.2
device number
81
231
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