ABB Relion 650 Series Technical Manual page 265

1MRK 506 326-UUS B
8.2.1 Identification
Function description
Overfrequency protection
8.2.2 Functionality
Overfrequency protection function SAPTOF (81) is applicable in all situations, where reliable
detection of high fundamental power system frequency is needed.
Overfrequency occurs at sudden load drops or shunt faults in the power network. Close to the
generating plant, generator governor problems can also cause over frequency.
SAPTOF (81) is used mainly for generation shedding and remedial action schemes. It is also used
as a frequency stage initiating load restoring.
SAPTOF (81) is provided with an undervoltage blocking.
8.2.3 Function block
V3P*
BLOCK
ANSI09000280 V1 EN-US
Figure 132: SAPTOF (81) function block
8.2.4 Signals
Table 193: SAPTOF (81) Input signals
Name
V3P
BLOCK
Table 194: SAPTOF (81) Output signals
Name
TRIP
BFI
BLKDMAGN
Line distance protection REL650
Technical manual
SAPTOF (81)
TRIP
BFI
BLKDMAGN
ANSI09000280-1-en.vsd
Type Default
GROUP
SIGNAL
BOOLEAN
Type
BOOLEAN
BOOLEAN
BOOLEAN
© Copyright 2011 ABB Power Grids. All rights reserved
IEC 61850 IEC 60617
identification identification
SAPTOF
f >
SYMBOL-O V1 EN-US
Description
- Three phase group signal for voltage inputs
0 Block of function
Description
Common trip signal
General pickup signal
Measurement blocked due to low amplitude
Frequency protection
ANSI/IEEE C37.2
device number
81
PID-1968-INPUTSIGNALS v6
PID-1968-OUTPUTSIGNALS v6
Section 8
M14866-1 v4
M14953-3 v7
M14956-3 v5
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