GUID-7EA9731A-8D56-4689-9072-D72D9CDFD795 v8
Table 68. Voltage-restrained time overcurrent protection VRPVOC
Function Range or value Accuracy
Start overcurrent (2.0 - 5000.0)% of IBase ±1.0% of I
r
at I ≤ I
r
±1.0% of I at I > I
r
Reset ratio, overcurrent > 95% -
Operate time, start overcurrent at 0 to 2 x
I
set
Min. = 15 ms -
Max. = 30 ms
Reset time, start overcurrent at 2 x I
set
to 0 Min. = 15 ms -
Max. = 30 ms
Operate time, start overcurrent at 0 to 10
x I
set
Min. = 5 ms
Max. = 20 ms
-
Reset time, start overcurrent at 10 x I
set
to
0
Min. = 20 ms
Max. = 35 ms
-
Independent time delay to operate at 0 to
2 x I
set
(0.00 - 6000.00) s ±0.2% or ±35 ms whichever is greater
Inverse time characteristics,
see tables 182 and 183
13 curve types See tables 182 and 183
Minimum operate time for inverse time
characteristics
(0.00 - 60.00) s ±0.2% or ±35 ms whichever is greater
High voltage limit, voltage dependent
operation
(30.0 - 100.0)% of UBase ±1.0% of U
r
Start undervoltage (2.0 - 100.0)% of UBase ±0.5% of U
r
Reset ratio, undervoltage < 105% -
Operate time start undervoltage at 2 x U
set
to 0
Min. = 15 ms -
Max. = 30 ms
Reset time start undervoltage at 0 to 2 x
U
set
Min. = 15 ms -
Max. = 30 ms
Independent time delay to operate,
undervoltage at 2 x U
set
to 0
(0.00 - 6000.00) s ±0.2% or ±35 ms whichever is greater
Internal low voltage blocking (0.0 - 5.0)% of UBase ±0.25% of U
r
Overcurrent:
Critical impulse time
Impulse margin time
10 ms typically at 0 to 2 x I
set
15 ms typically
-
Undervoltage:
Critical impulse time
Impulse margin time
10ms typically at 2 x U
set
to 0
15 ms typically
-
Generator protection REG670
1MRK 502 074-BEN M
Hitachi Power Grids 89
© Copyright 2017 Hitachi Power Grids. All rights reserved
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