ABB RED650 - Technical Data; Rate-Of-Change of Frequency Protection SAPFRC; Identification; Functionality

10.2.7 Technical data
M14964-1 v12
Table 145: SAPTOF technical data
Function
Range or value Accuracy
Operate value, start function
at symmetrical three-phase
voltage
(35.00-90.00) Hz
±2.0 mHz
Operate time, start at f
set
-0.02 Hz to f
set
+0.02 Hz
fn = 50Hz
Min. = 80 ms
Max. = 95 ms
-
fn = 60 Hz
Min. = 65 ms
Max. = 80 ms
Reset time, start at f
set
+0.02
Hz to f
set
-0.02 Hz
Min. = 15 ms
Max. = 30 ms
-
Operate time, definite time
function at f
set
-0.02 Hz to f
set
+0.02 Hz
(0.000-60.000)s
±0.2% ±100 ms
whichever is greater
Reset time, definite time
function at f
set
+0.02 Hz to
f
set
-0.02 Hz
(0.000-60.000)s
±0.2% ±120 ms,
whichever is greater
10.3 Rate-of-change of frequency protection SAPFRC
IP15748-1 v4
10.3.1 Identification
M14868-1 v4
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Rate-of-change of frequency protection SAPFRC
df/dt
>
<
SYMBOL-N V1 EN-US
81
10.3.2 Functionality
M14965-3 v13
The rate-of-change of frequency protection function (SAPFRC ) gives an early
indication of a main disturbance in the system. SAPFRC measures frequency with
high accuracy, and can be used for generation shedding, load shedding and
remedial action schemes. SAPFRC can discriminate between a positive or negative
change of frequency. A definite time delay is provided for operate.
SAPFRC is provided with an undervoltage blocking. The operation is based on
positive sequence voltage measurement and requires two phase-phase or three
phase-neutral voltages to be connected. For information about how to connect
1MRK 505 394-UEN A Section 10
Frequency protection
Line differential protection RED650 2.2 IEC 277
Technical manual