ABB Relion 670 Series Product Manual page 56

Line differential protection RED670 2.0
Product version: 2.0
Table 25. Line differential protection L3CPDIF, L6CPDIF, LT3CPDIF, LT6CPDIF , continued
Function
**Operate time, unrestrained
negative sequence function
**Reset time, unrestrained negative
sequence function
The data in the table are valid for a single IED with two local current input groups.
*Note: Data obtained with single input current group.
**Note: Data obtained with two input current groups. The rated symmetrical currents are applied on both sides as pre- and after-fault currents. The
fault is performed by increasing one phase current to double on one side and decreasing same phase current to zero on the other side.
Table 26. Additional security logic for differential protection LDRGFC
Function
Operate current, zero sequence current
Operate current, low current operation
Operate voltage, phase to neutral
Operate voltage, phase to phase
Independent time delay, zero sequence current at 0 to 2 x I
Independent time delay, low current operation at 2 x I
Independent time delay, low voltage operation at 2 x U
Reset time delay for startup signal at 0 to 2 x U
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Range or value
Min. = 10 ms
Max. = 20 ms
Min. = 10 ms
Max. = 35 ms
set
to 0
set
to 0
set
set
Accuracy
-
-
Range or value
(1-100)% of lBase
(1-100)% of lBase
(1-100)% of UBase
(1-100)% of UBase
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
(0.000-60.000) s
1MRK505310-BEN C
Accuracy
±1.0% of I
r
±1.0% of I
r
±0.5% of U
r
±0.5% of U
r
±0.2% or ±40 ms
whichever is greater
±0.2% or ± 40 ms
whichever is greater
±0.2% or ±40 ms
whichever is greater
±0.2% or ±40 ms
whichever is greater
ABB