M14976-1 v11
Table 55. Rate-of-change frequency protection SAPFRC
Function
Range and value
Accuracy
Operate value, start function, at
symmetrical three phase voltage *,
StartFreqGrad
or
Gs
per IEC
60255-181 standard
Positive gradient: from 0.05 to 10.00 Hz/s **
Negative gradient: from -0.05 to -10.00 Hz/s **
±10.0 mHz/s
Reset hysteresis *
< 15.0 mHz/s
Operate value, restore enable
frequency, at symmetrical three
phase voltage,
RestoreFreq
(45.00 - 65.00) Hz
±2.0 mHz
Restore time delay,
tRestore
fr = 50 Hz
(0.025 - 60.000) s
±0.2% or ±110 ms
whichever is greater
Test conditions:
Restore time delay measurement
with sudden frequency change
from
RestoreFreq
-0.02 Hz to
RestoreFreq
+ 0.02 Hz
fr = 60 Hz
±0.2% or ±100 ms
whichever is greater
Start time *
fr = 50 Hz
Gs: ±0.05 & ±0.50 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0, 10.0 x Gs
Min. = 110 ms
Max. = 290 ms
Gs: ±1.00 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0 x Gs
Min. = 180 ms
Max. = 300 ms
Gs: ±3.00, ±6.00 & ±10.00
Hz/s
Tested frequency slope:
1.2, 2.0 x Gs
Min. = 300 ms
Max. = 390 ms
fr = 60 Hz
Gs: ±0.05 & ±0.50 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0, 10.0 x Gs
Min. = 90 ms
Max. = 220 ms
Gs: ±1.00 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0 x Gs
Min. = 140 ms
Max. = 240 ms
Gs: ±3.00, ±6.00 & ±10.00
Hz/s
Tested frequency slope:
1.2, 2.0 x Gs
Min. = 180 ms
Max. = 300 ms
Line distance protection REL650
1MRK 506 384-BEN H
Version 2.2
Hitachi Power Grids
75
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