Table of Contents
Line distance protection REL670
Version 2.2
Table 79. Rate-of-change frequency protection SAPFRC
Function
Operate value, start function, at
symmetrical three phase voltage *,
StartFreqGrad or Gs per IEC
60255-181 standard
Reset hysteresis *
Operate value, restore enable
frequency, at symmetrical three
phase voltage, RestoreFreq
Restore time delay, tRestore
Test conditions:
Restore time delay measurement
with sudden frequency change
from RestoreFreq -0.02 Hz to
RestoreFreq + 0.02 Hz
Start time *
Hitachi Energy
M14976-1 v11
Range and value
Positive gradient: from 0.05 to 10.00 Hz/s **
Negative gradient: from -0.05 to -10.00 Hz/s **
< 15.0 mHz/s
(45.00 - 65.00) Hz
fr = 50 Hz
(0.025 - 60.000) s
fr = 60 Hz
fr = 50 Hz
Gs: ±0.05 & ±0.50 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0, 10.0 x Gs
Gs: ±1.00 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0 x Gs
Gs: ±3.00, ±6.00 & ±10.00
Hz/s
Tested frequency slope:
1.2, 2.0 x Gs
fr = 60 Hz
Gs: ±0.05 & ±0.50 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0, 10.0 x Gs
Gs: ±1.00 Hz/s
Tested frequency slope:
1.2, 2.0, 5.0 x Gs
Gs: ±3.00, ±6.00 & ±10.00
Hz/s
Tested frequency slope:
1.2, 2.0 x Gs
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1MRK 506 372-BEN Q
Accuracy
±10.0 mHz/s
±2.0 mHz
±0.2% or ±110 ms
whichever is greater
±0.2% or ±100 ms
whichever is greater
Min. = 110 ms
Max. = 290 ms
Min. = 180 ms
Max. = 300 ms
Min. = 300 ms
Max. = 390 ms
Min. = 90 ms
Max. = 220 ms
Min. = 140 ms
Max. = 240 ms
Min. = 180 ms
Max. = 300 ms
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