ABB Relion 670 series - Page 681

10.2.8 Technical data
M14964-1 v12
Table 391: SAPTOF (81) technical data
Function Range or value Accuracy
Trip value, pickup function at symmetrical
three-phase voltage
(35.00-90.00) Hz ±2.0 mHz
Trip time, pickup 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, pickup at f
set
+0.02 Hz to f
set
-0.02
Hz
Min. = 15 ms
Max. = 30 ms
-
Trip 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 frequency protection SAPFRC (81)
IP15748-1 v3
10.3.1 Identification
M14868-1 v3
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-US
81
10.3.2 Functionality
M14965-3 v12
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 trip.
SAPFRC (81) 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 analog inputs, refer to Application
manual/IED application/Analog inputs/Setting guidelines.
1MRK 502 066-UUS B Section 10
Frequency protection
675
Technical manual