Underfrequency Protection Saptuf (81) - ABB REG650 Technical Manual

1MRK 502 043-UUS B
Section 10
10.1
10.1.1
10.1.2
10.1.3
Technical Manual
Frequency protection

Underfrequency protection SAPTUF (81)

Identification
Function description
Underfrequency protection
Functionality
Underfrequency occurs as a result of a lack of sufficient generation in the network.
Underfrequency protection SAPTUF (81) is used for load shedding systems, remedial
action schemes, gas turbine startup and so on.
SAPTUF (81) is also provided with undervoltage blocking.
Function block
SAPTUF (81)
V3P* TRIP
BLOCK PICKUP
RESTORE
BLKDMAGN
ANSI09000282-1-en.vsd
ANSI09000282 V1 EN
Figure 135: SAPTUF (81) 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
291