DOC. MIE91093 Rev. 1.34
Page 79 of 145
tests will continue until fault N+1 is generated, followed by
open N+1 and reclose N+1.
.
Second test
: TD is programmed smaller than the set
reclaim TDr, for instance 0.95*TDr. Program the number of
tests N foreseen by the Recloser. As the fault arrives before
the reclaim time is expired, after N+1 faults the Recloser must
not issue the close command. This behavior confirms that
faults occur before TDr has expired. The following time
diagram explains the test evolution.
The second test allows also to verify the reclose timings RX,
and the number of reclose commands, N.
The first fault starts the sequence. The relay trips after D1;
the Recloser sends a reclose command after R1. The test set
automatically injects fault No. 2 after the programmed TD,
that is less than TDr. If N = 1, the sequence is completed;
else, tests will continue until fault N+1 is generated, followed
by open N+1, but no reclose N+1; the CB will be left open.
The test set waits for the last close command for a time equal
to 10 times the last measured RX delay; then, the sequence is
finished.
The two tests together allow verifying TDr with the set
accuracy (for instance, 5%).
1
TRIP
CLOSE
CB POS
1
N+1
N+1
2
2
1
2
CLOSED
OPEN
(N+1
)
D1
R1
<TDr
