Hitachi Relion 670 Series Product Manual page 118

Line differential protection RED670
Version 2.2
Table 83. Underfrequency protection SAPTOF
Function
Operate value, start function, at
symmetrical three phase
1)
voltage, StartFrequency
1)
Reset hysteresis
1)
Operate time
1)
Disengaging time
Operate time delay,
1)
tDelay
Note: The stated accuracy is valid for the voltage range 50 V – 250 V secondary.
1) The settings and test conditions are in accordance with IEC 60255-181 standard (section 6.2 – 6.7).
118
M14964-1 v13
Start time measurement with sudden
frequency change
fr = 50 Hz
Start time measurement with
frequency ramp
Start time measurement with sudden
frequency change
fr = 60 Hz
Start time measurement with
frequency ramp
Start time measurement with sudden
frequency change
fr = 50 Hz
Start time measurement with
frequency ramp
Start time measurement with sudden
frequency change
fr = 60 Hz
Start time measurement with
frequency ramp
fr = 50 Hz
fr = 60 Hz
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Range or Value
(35.00 - 90.00) Hz
10.0 mHz fixed
Min. = 175 ms
Max. = 195 ms
Min. = 70 ms
Max. = 90 ms
Min. = 150 ms
Max. = 165 ms
Min. = 60 ms
Max. = 75 ms
Min. = 20 ms
Max. = 30 ms
Min. = 75 ms
Max. = 100 ms
Min. = 20 ms
Max. = 30 ms
Min. = 65 ms
Max. = 90 ms
(0.000-60.000)s
1MRK 505 379-BEN R
Accuracy
±2.0 mHz
±2.0 mHz
-
-
-
-
±0.2% or ±200 ms
whichever is greater
±0.2% or ±175 ms
whichever is greater
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