Voltage-Restrained Time Overcurrent Protection Vrpvoc - ABB RET670 Product Manual

Transformer protection RET670 2.0
Product version: 2.0
Table 67. Voltage-restrained time overcurrent protection VRPVOC
Function
Start overcurrent
Reset ratio, overcurrent
Operate time, start overcurrent at 0 to 2 x I
Reset time, start overcurrent at 2 to 0 x I
Operate time, start overcurrent at 0 to 10 x I
Reset time, start overcurrent at 10 to 0 x I
Independent time delay to operate at 0 to 2 x I
Inverse time characteristics,
see tables 117 and 118
Minimum operate time for inverse time characteristics
High voltage limit, voltage dependent operation
Start undervoltage
Reset ratio, undervoltage
Operate time start undervoltage at 2 to 0 x U
Reset time start undervoltage at 0 to 2 x U
Independent time delay to operate, undervoltage at 2 to 0 x U
Internal low voltage blocking
Overcurrent:
Critical impulse time
Impulse margin time
Undervoltage:
Critical impulse time
Impulse margin time
ABB
Range or value
(2.0 - 5000.0)% of IBase
> 95%
Min. = 15 ms
set
Max. = 30 ms
Min. = 15 ms
set
Max. = 30 ms
Min. = 5 ms
set
Max. = 20 ms
Min. = 20 ms
set
Max. = 35 ms
(0.00 - 6000.00) s
set
13 curve types
(0.00 - 60.00) s
(30.0 - 100.0)% of UBase
(2.0 - 100.0)% of UBase
< 105%
Min. = 15 ms
set
Max. = 30 ms
Min. = 15 ms
set
Max. = 30 ms
(0.00 - 6000.00) s
set
(0.0 - 5.0)% of UBase
10 ms typically at 0 to 2 x I
15 ms typically
10ms typically at 2 to 0 x U
15 ms typically
1MRK 504 141-BEN C
Accuracy
±1.0% of I at I ≤ I
r
±1.0% of I at I > I
-
-
-
-
-
±0.2% or ±35 ms whichever is
greater
See tables 117
±0.2% or ±35 ms whichever is
greater
±1.0% of U
r
±0.5% of U
r
-
-
-
±0.2% or ±35 ms whichever is
greater
±0.25% of U
-
set
-
set
r
r
and 118
r
79