ABB REC650 ANSI - Functionality; Technical Data

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