ABB Relion 670 Series Product Manual page 88

Generator protection REG670
Version 2.2
Table 67. Generator rotor overload protection GRPTTR
Function
Overcurrent start level for overload
protection
Reset ratio, overcurrent
Start time, overcurrent at 0 to 2 x
I
set
Thermal time characteristic
Minimum operate time for thermal
characteristic
Maximum operate time for thermal
characteristic
Undercurrent start level
Start time, undercurrent at 2 x I
to 0
Independent time delay for
undercurrent function at 2 x I
0
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GUID-A1CB5B4F-768E-4B1B-937E-B91EC3EFA2CC v4
Range or value
(105.0–900.0)% of IBase
>95%
Min = 50 ms
Max = 170 ms
According to
IEEE Std C50.13–2005
(1.0–120.0) s
(100.0–2000.0) s
(5.0–500.0)% of IBase
Min = 15 ms
set
Max = 30 ms
(0.0–600.0) s
to
set
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Accuracy
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
—
—
±1.5% or ±200 ms whichever is greater
±1.5% or ±200 ms whichever is greater
±1.5% or ±200 ms whichever is greater
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
—
±0.2% or ±45 ms whichever is greater
1MRK 502 074-BEN M
Hitachi Power Grids