Section 10
Frequency protection
10.1
Underfrequency protection SAPTUF (81)
IP15746-1 v3
10.1.1
Identification
M14865-1 v5
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Underfrequency protection
SAPTUF
f <
SYMBOL-P V1 EN-US
81
10.1.2
Functionality
M13349-3 v12
Underfrequency occurs as a result of a lack of generation in the network.
Underfrequency protection SAPTUF (81) 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 trip and restore.
SAPTUF (81) is provided with undervoltage blocking.
The operation is based on positive sequence voltage measurement and requires two phase-phase
or three phase-neutral voltages to be connected. For information about how to connect analog
inputs, refer to Application manual/IED application/Analog inputs/Setting guidelines
10.1.3
Function block
M13352-3 v6
ANSI06000279-2-en.vsd
SAPTUF (81)
V3P*
BLOCK
BLKTRIP
BLKREST
TRIP
PICKUP
RESTORE
BLKDMAGN
FREQ
ANSI06000279 V2 EN-US
Figure 361: SAPTUF (81) function block
1MRK 502 066-UUS B
Section 10
Frequency protection
665
Technical manual
Содержание Relion 670 series
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