10.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overfrequency protection SAPTOF
SYMBOL-O V1 EN
81
10.2.2 Functionality
Overfrequency protection function SAPTOF is applicable in all situations, where
reliable detection of high fundamental power system frequency is needed.
Overfrequency occurs because of sudden load drops or shunt faults in the power
network. Close to the generating plant, generator governor problems can also cause
over frequency.
SAPTOF measures frequency with high accuracy, and is used mainly for generation
shedding and remedial action schemes. It is also used as a frequency stage initiating
load restoring. A definite time delay is provided for operate.
SAPTOF is provided with an undervoltage blocking.
10.2.3 Function block
SAPTOF
U3P*
BLOCK
TRIP
START
BLKDMAGN
IEC09000280_1_en.vsd
IEC09000280 V1 EN
Figure 151: SAPTOF function block
10.2.4 Signals
Table 189: SAPTOF Input signals
Name
Type Default Description
U3P GROUP
SIGNAL
- Three phase group signal for voltage inputs
BLOCK BOOLEAN 0 Block of function
1MRK 502 048-UEN A Section 10
Frequency protection
299
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