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Function
Range or value
Accuracy
Reset time, definite time function at f
set
- 0.02 Hz to
f
set
+ 0.02 Hz
(0.000-60.000)s
±0.2% or ±120
ms whichever is
greater
Voltage dependent time delay
Settings:
VNom=(50-150)% of V
base
VMin=(50-150)% of V
base
Exponent=0.0-5.0
t_MaxTripDelay=(0.010–
60.000)s
t_MinTripDelay=(0.010–
60.000)s
±1.0% or ±100
ms whichever is
greater
(
)
_
_
_
Exponent
V VMin
t
t MaxTripDelay t MinTripDelay
t MinTripDelay
VNom VMin
-
=
×
-
+
-
é
ù
ê
ú
ë
û
EQUATION1559 V1 EN-US
(Equation 62)
V=V
measured
10.2
Overfrequency protection SAPTOF (81)
IP15747-1 v3
10.2.1
Identification
M14866-1 v4
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overfrequency protection
SAPTOF
f >
SYMBOL-O V1 EN-US
81
10.2.2
Functionality
M14953-3 v12
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 trip.
Section 10
1MRK 511 408-UUS A
Frequency protection
308
Phasor measurement unit RES670 2.2 ANSI
Technical manual
Содержание Relion RES670
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