Hitachi Relion 670 Series Product Manual page 85

Line differential protection RED670
Version 2.2
Table 38. Line differential protection L3CPDIF, L6CPDIF, LT3CPDIF , LT6CPDIF with 64 Kbit/s communication , 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 64 Kbits/s communication in the loop-back mode.
*Note: Data obtained with single three-phase input current group. The operate and reset times for L3CPDIF are valid for the static output from
SOM.
**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.
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Range or value
Min. = 15 ms
Max. = 35 ms
Min. = 15 ms
Max. = 40 ms
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Accuracy
-
-
1MRK 505 379-BEN R
85