ABB RELION 670 Series Product Manual page 94

Transformer protection RET670 2.1 IEC
Table 73. 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 157 and 158
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
set
Internal low voltage blocking
Overcurrent:
Critical impulse time
Impulse margin time
Undervoltage:
Critical impulse time
Impulse margin time
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GUID-7EA9731A-8D56-4689-9072-D72D9CDFD795 v7
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
(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 504 155-BEN F
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 157
±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
r
-
set
-
set
r
r
and 158
ABB