Table 53. Under frequency protection SAPTUF
Function
Range or value
Accuracy
Operate value, start function
(35.00-75.00) Hz
±2.0 mHz
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
Line distance protection REL650
1MRK 506 384-BEN H
Version 2.2
Hitachi Power Grids
73
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