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3.
If the upstream recloser or breaker closes and further fault detected, could be considered a
permanent fault condition and wiAutoLink process an Fault condition again waiting an opening
of the upstream recloser or breaker.
”Device returned to normal condition”
4.
If the upstream recloser or breaker open again and the occurrence of zero current, the
sectionalizer registers the last count and wiAutoLink opening procedure are performed as
indicated below:
a.
So far, show information
“Fault tripping condition”
b.
Opening operation
“
Tripping operation has been successfully performed
”
c.
After Opening operation
“
Device has been normally powered down (after trip)”
Below, in figure 4 diagram.
5.
Figure 39.
The times shown in Diagrams B and C as T1 correspond to the time the recloser takes to reconnect the
circuit. This “dead time” is usually adjustable up to 3 minutes. The wiAutoLink can operate while
keeping the count performed with the current at zero for up to 3.5 minutes, above any possible dead line
value configured in the recloser.
Due to the latest technological improvements recently introduced to reclosers, the time indicated as T2
is the time the recloser takes to open after the fault detected. The wiAutoLink, by means of the spectral
analysis in the second harmonic, only needs one cycle to identify a current as a fault current, isolating it
from symmetric and asymmetric inrush currents. This feature adds an outstanding technical advantage
to the wiAutoLink.
D.2.2.2.
Operating Under Permanent Fault Conditions with Trip three count setting Recloser.
1.
The wiAutoLink is in monitor mode under normal load conditions.
wiAutoLink register
“Device returned to normal condition”
if last overhead has been solved
without trip or
“
The device has been normally powered up
”
if is the first time that wiAutoLink
has powered.
2.
When a fault is present the wiAutoLink senses a current above a programmed pickup threshold
(Ia wiAutoLink) and becomes active.
So far, wiAutoLink process a Fault condition and waits an opening of the upstream recloser or
breaker.
