Functionality; Technical Data - ABB REC650 ANSI Technical Manual

1MRK 511 287-UUS A
8.2.8
8.3
8.3.1
8.3.2
Technical manual

Technical data

Table 144: SAPTOF (81) technical data
Function
Operate value, pickup function
Reset ratio
Operate time, pickup function
Reset time, pickup function
Timer
Rate-of-change frequency protection SAPFRC (81)
Identification
Function description
Rate-of-change frequency protection

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.
Range or value
(35.00-75.00) Hz
>0.999
At 50 Hz: 200 ms typically at f
+0.5 Hz
At 60 Hz: 170 ms typically at f
+0.5 Hz
At 50 and 60 Hz: 55 ms typically at f
to f -0.5 Hz
set
(0.000-60.000)s
IEC 61850 IEC 60617
identification identification
SAPFRC
SYMBOL-N V1 EN
Section 8
Frequency protection
Accuracy
± 2.0 mHz at
symmetrical three-
phase voltage
-
-0.5 Hz to f -
set set
-0.5 Hz to f
set set
+0.5 Hz -
set
<250 ms
ANSI/IEEE C37.2
device number
81
df/dt > <
199