Section 8 Frequency Protection; Underfrequency Protection Saptuf; Identification; Functionality - ABB REC650 Technical Manual

1MRK 511 287-UEN A
Section 8
8.1
8.1.1
8.1.2
8.1.3
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 78: SAPTUF function block
Frequency protection
IEC 61850 IEC 60617
identification identification
SAPTUF
f <
SYMBOL-P V1 EN
Section 8
ANSI/IEEE C37.2
device number
81
179