Frequency protection
Table 42. Under frequency protection SAPTUF
Function
Range or value
Accuracy
Operate value, start function
(35.00-75.00) Hz
± 2.0 mHz at
symmetrical three-
phase voltage
Operate value, restore frequency
(45 - 65) Hz
± 2.0 mHz
Reset ratio
<1.001
-
Operate time, start 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, start function
At 50 Hz: 60 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
At 60 Hz: 50 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
-
Operate time delay
(0.000-60.000)s
<250 ms
Restore time delay
(0.000-60.000)s
<150 ms
Table 43. Overfrequency protection SAPTOF
Function
Range or value
Accuracy
Operate value, start function
(35.00-75.00) Hz
± 2.0 mHz at
symmetrical three-
phase voltage
Reset ratio
>0.999
-
Operate time, start 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, start 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
Table 44. Rate-of-change frequency protection SAPFRC
Function
Range or value
Accuracy
Operate value, start function
(-10.00-10.00) Hz/s
± 10.0 mHz/s
Operate value, restore enable frequency
(45.00 - 65.00) Hz
± 2.0 mHz
Timers
(0.000 - 60.000) s
<130 ms
Operate time, start function
At 50 Hz: 100 ms typically
At 60 Hz: 80 ms typically
-
Transformer protection RET650
1MRK 504 137-BEN B
Product version: 1.3
48
ABB
