GUID-A1CB5B4F-768E-4B1B-937E-B91EC3EFA2CC v3
Table 63. Generator rotor overload protection GRPTTR
Function
Range or value
Accuracy
Overcurrent start level for
overload protection
(105.0–900.0)% of IBase
±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Reset ratio, overcurrent
>95%
—
Start time, overcurrent at 0 to 2 x
I
set
Min = 50 ms
—
Max = 170 ms
Thermal time characteristic
According to
IEEE Std C50.13–2005
±1.5% or ±200 ms whichever is greater
Minimum operate time for
thermal characteristic
(1.0–120.0) s
±1.5% or ±200 ms whichever is greater
Maximum operate time for
thermal characteristic
(100.0–2000.0) s
±1.5% or ±200 ms whichever is greater
Undercurrent start level
(5.0–500.0)% of IBase
±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Start time, undercurrent at 2 to 0
x I
set
Min = 15 ms
—
Max = 30 ms
Independent time delay for
undercurrent function at 2 to 0 x
I
set
(0.0–600.0) s
±0.2% or ±45 ms whichever is greater
1MRK 502 068-BEN D
Generator protection REG670 2.1 IEC
Product version: 2.1
70
ABB
Содержание RELION 670 SERIES REG670
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