Appendix L L-PRO Setting Example
Appendix L-26
L-PRO 4000 User Manual
D02706R02.30
Notes:
* Security Margin = 0.5 to 1 cycle or a percentage of total expected time to account for errors in
scheme timing assumptions.
** Parallel Line applications: fault contribution can come from unfaulted line appearing as a Zone
2 fault at one end and zone 4 reverse fault at the other end. Depending on the location of the fault
on the faulted line and which breaker clears first, the current may change direction and the 2 ter-
minals on the unfaulted line may change state from forward to reverse and reverse to forward.
The unfaulted line contribution may come either end on a networked system.
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