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8.2.8
Technical data
Table 144:
SAPTOF (81) technical data
Function
Range or value
Accuracy
Operate value, pickup function
(35.00-75.00) Hz
± 2.0 mHz at
symmetrical three-
phase voltage
Reset ratio
>0.999
-
Operate time, pickup function
At 50 Hz: 200 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
At 60 Hz: 170 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
-
Reset time, pickup function
At 50 and 60 Hz: 55 ms typically at f
set
+0.5 Hz
to f
set
-0.5 Hz
-
Timer
(0.000-60.000)s
<250 ms
8.3
Rate-of-change frequency protection SAPFRC (81)
8.3.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Rate-of-change frequency protection
SAPFRC
df/dt
><
SYMBOL-N V1 EN
81
8.3.2
Functionality
The rate-of-change frequency protection function SAPFRC (81) gives an early indication
of a main disturbance in the system. SAPFRC (81) measures frequency with high
accuracy, and can be used for generation shedding, load shedding and remedial action
schemes. SAPFRC (81) can discriminate between a positive or negative change of
frequency. A definite time delay is provided for operate.
SAPFRC (81) is provided with an undervoltage blocking.
1MRK 511 287-UUS A
Section 8
Frequency protection
199
Technical manual
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