ABB Relion 670 Series Product Manual page 96

Generator protection REG670
Version 2.2
Table 77. 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,
tDelay 1)
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).
Table 78. Rate-of-change of frequency protection SAPFRC
Function
Operate value, start function
Operate value, restore enable frequency
Definite restore time delay
Definite time delay for frequency gradient
trip
Definite reset time delay
96
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
M14976-1 v10
Range or value
(-10.00-10.00) Hz/s
(45.00-65.00) Hz
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
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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
Accuracy
±10.0 mHz/s
±2.0 mHz
±0.2% or ±100 ms whichever is greater
±0.2% or ±120 ms whichever is greater
±0.2% or ±250 ms whichever is greater
1MRK 502 074-BEN M
Accuracy
±2.0 mHz
±2.0 mHz
-
-
-
-
±0.2% or ±200 ms
whichever is greater
±0.2% or ±175 ms
whichever is greater
Hitachi Power Grids