Function
Range or value
Accuracy
Reset time, pickup function
At 50 Hz: 60 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
At 60 Hz: 50 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
-
Operate time delay
(0.000-60.000)s
<250 ms
Restore time delay
(0.000-60.000)s
<150 ms
10.2
Overfrequency protection SAPTOF (81)
10.2.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overfrequency protection
SAPTOF
f >
SYMBOL-O V1 EN
81
10.2.2
Functionality
Overfrequency protection function SAPTOF (81) is applicable in all situations, where
reliable detection of high fundamental power system frequency is needed.
Overfrequency occurs 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 (81) 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 (81) is provided with an undervoltage blocking.
1MRK 502 048-UUS A
Section 10
Frequency protection
323
Technical manual
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