ABB Relion 650 Series Product Manual page 69

Transformer protection RET650
Version 2.2
Table 51. Under frequency protection SAPTUF
Function
Operate value, start function
Operate value, restore frequency
Reset ratio
Operate time, start function
Reset time, start function
Operate time delay
Restore time delay
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Range or value
(35.00-75.00) Hz
(45 - 65) Hz
<1.001
At 50 Hz: 200 ms typically at f
set
f -0.5 Hz
set
At 60 Hz: 170 ms typically at f
set
f -0.5 Hz
set
At 50 Hz: 60 ms typically at f
set
+0.5 Hz
At 60 Hz: 50 ms typically at f
set
+0.5 Hz
(0.000-60.000)s
(0.000-60.000)s
1MRK 504 172-BEN G
Accuracy
±2.0 mHz
±2.0 mHz
-
+0.5 Hz to -
+0.5 Hz to
-0.5 Hz to f -
set
-0.5 Hz to f
set
<250 ms
<150 ms
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