ABB 1MRK002826-AG - Page 87

GUID-9B1C0C10-8AF9-4D9E-8076-B3E1C238D29A v8
Table 65. Accidental energizing protection for synchronous generator AEGPVOC
Function Range or value Accuracy
Operate value, overcurrent (5-900)% of IBase ±1.0% of I
r
at I≤I
r
±1.0% of I at I>I
r
Reset ratio, overcurrent >95% at (20–900)% of IBase -
Transient overreach, overcurrent
function
<10% at τ = 100 ms -
Critical impulse time, overcurrent 10 ms typically at 0 to 2 x I
set
-
Impulse margin time, overcurrent 15 ms typically -
Operate value, undervoltage (2-150)% of UBase ±0.5% of U
r
at U ≤ U
r
±0.5% of U at U > U
r
Critical impulse time, undervoltage 10 ms typically at 2 x U
set
to 0 -
Impulse margin time, undervoltage 15 ms typically -
Operate value, overvoltage (2-200)% of UBase ±0.5% of U
r
at U ≤ U
r
±0.5% of U at U > U
r
Definite time delay, overcurrent, at 0
to 2 x I
set
(0.000-60.000) s ±0.2% or ±35 ms whichever is greater
Definite time delay, undervoltage, at
1.2 x U
set
to 0.8 x U
set
(0.000-60.000) s ±0.2% or ±35 ms whichever is greater
Definite time delay, overvoltage, at 0.8
x U
set
to 1.2 x U
set
(0.000-60.000) s ±0.2% or ±35 ms whichever is greater
GUID-3C80D7DB-2ECA-4429-B1BA-2977C7ECE644 v4
Table 66. Generator stator overload protection GSPTTR
Function Range or value Accuracy
Current 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 >95%
Start time 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
Generator protection REG670
1MRK 502 074-BEN M
Version 2.2
Hitachi Power Grids 87
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