Table 35. Line differential protection L3CPDIF, L6CPDIF, LT3CPDIF , LT6CPDIF single IED without communication , continued
Function Range or value Accuracy
**Operate time, unrestrained negative
sequence function
Min. = 10 ms
Max. = 20 ms
-
**Reset time, unrestrained negative
sequence function
Min. = 10 ms
Max. = 35 ms
-
The data in the table are valid for a single IED with two local current input groups.
*Note: Data obtained with single three-phase input current group.
**Note: Data obtained with two three-phase input current groups. The rated symmetrical currents are applied on both sides as pre- and
post-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.
Line differential protection RED670
1MRK 505 379-BEN N
Hitachi Power Grids 77
© Copyright 2017 Hitachi Power Grids. All rights reserved
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