Hitachi Relion 670 Series Product Manual page 117

Line differential protection RED670
Version 2.2
Frequency protection
Table 82. Underfrequency protection SAPTUF
Function
Operate value, start function, at
symmetrical three phase voltage,
1)
StartFrequency
Reset hysteresis
1)
Operate time
1)
Disengaging time
Operate time delay,
1)
tDelay
Voltage dependent
time delay
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).
Hitachi Energy
M13360-1 v16
Range or Value
(35.00 - 75.00) Hz
10.0 mHz fixed
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
Settings:
UNom = (50-150)% of UBase
UMin = (50-150)% of UBase
Exponent = 0.0-5.0
tMax = (0.010-60.000)s
tMin = (0.010- 60.000)s
- Exponent
é ù
U UMin
=
t
ê ú
-
ë û
UNom UMin
=
U U
measured
EQUATION1182 V2 EN-US
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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
× - +
( tMax tMin ) tMin
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
±1.0% or ±120 ms
whichever is greater
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