Hitachi Relion 670 Series Product Manual page 120

Line differential protection RED670
Version 2.2
Table 84. Rate-of-change frequency protection SAPFRC , continued
Function
Disengaging time *
Operate time delay *, tDelay
Test conditions:
Gs: ± 0.2 Hz/s
Frequency slope: 0.4 Hz/s
Test points: 10%, 20%, 30%, 50%
and 100% of the time delay setting
range
Reset time delay, tReset
Test conditions:
Gs: ±0.2 Hz/s
Frequency slope: 0.4 Hz/s
* The settings and test conditions are in accordance with IEC 60255-181 standard (section 6.2 – 6.7).
** The value ±0.05 Hz/s is used as minimum pickup value for frequency gradient.
Note! The stated accuracy is valid for phase-to-earth voltage range from 50 V to 250 V secondary. During testing three phase-to-earth voltages
with magnitude of 110/sqrt(3)=63.5 V were always used.
120
Range and value
fr = 50 Hz Gs: ±0.05 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0, 10.0 x Gs
Gs: ±5.00 Hz/s
Tested frequency slope:
1.2, 2.0 x Gs
Gs: ±10.00 Hz/s
Tested frequency slope:
1.2 x Gs
fr = 60 Hz Gs: ±0.05 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0, 10.0 x Gs
Gs: ±5.00 Hz/s
Tested frequency slope:
1.2, 2.0 x Gs
Gs: ±10.00 Hz/s
Tested frequency slope:
1.2 x Gs
fr = 50 Hz (0.000-60.000) s
fr = 60 Hz
fr = 50 Hz (0.000-60.000) s
fr = 60 Hz
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1MRK 505 379-BEN R
Accuracy
Min. = 130 ms
Max. = 270 ms
Min. = 130 ms
Max. = 210 ms
Min. = 130 ms
Max. = 160 ms
Min. = 100 ms
Max. = 210 ms
Min. = 100 ms
Max. = 170 ms
Min. = 100 ms
Max. = 130 ms
±0.2% or ±220 ms
whichever is greater
±0.2% or ±180 ms
whichever is greater
±0.2% or ±220 ms
whichever is greater
±0.2% or ±180 ms
whichever is greater
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