ABB Relion 650 Series Technical Manual page 261

1MRK 506 326-UUS B
Section 8
8.1 Underfrequency protection SAPTUF (81)
8.1.1 Identification
Function description
Underfrequency protection
8.1.2 Functionality
Underfrequency occurs as a result of lack of 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 provided with an undervoltage blocking.
8.1.3 Function block
V3P*
BLOCK
ANSI09000282 V1 EN-US
Figure 130: SAPTUF (81) function block
8.1.4 Signals
Table 188: SAPTUF (81) Input signals
Name
V3P
BLOCK
Line distance protection REL650
Technical manual
Frequency protection
SAPTUF (81)
TRIP
PICKUP
RESTORE
BLKDMAGN
ANSI09000282-1-en.vsd
Type Default
GROUP
SIGNAL
BOOLEAN
© Copyright 2011 ABB Power Grids. All rights reserved
IEC 61850 IEC 60617
identification identification
SAPTUF
f <
SYMBOL-P V1 EN-US
Description
- Three phase group signal for voltage inputs
0 Block of function
Frequency protection
ANSI/IEEE C37.2
device number
81
PID-1969-INPUTSIGNALS v6
Section 8
IP15746-1 v3
M14865-1 v4
M13349-3 v7
M13352-3 v5
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