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1YSA160045-EN - Rev. 5
D.3.
Minimum Time Required for Power up the wiAutoLink
The wiAutoLink is a self-powered device. The following graphs displays the minimum time required for the device to be powered at
different currents to enable the operation. The wiAutoLink can harvest the required energy from the precharge current and also from the
fault current as far as it fulfills the time-current requirement for fully charge its main energy storage device. The minimum nominal current
of the wiAutoLink to be fully charged is 5A.
100
90
80
70
60
50
40
30
20
10
0
0
D.4.
Minimum Autoreclosing Operating Time required for wiAutoLink operation
The wiAutoLink requires a line current greater than 5 A in order to be fully charged during at least 90 seconds. After the condition
of the device is fully charged the line current can vary as low as 3A and it will continue to be operative.
The recloser reclaim time should be set to 90 seconds. When a fault occurs before that time the recloser goes directly to lockout. If
a fault occurs after that time the reclosing sequence is done. The recloser reclaim time is designed to prevent the reclosing operation before
the sectionalizer is ready to operate (wiAutoLink is fully charged).
The wiAutoLink is able to detect a fault on the line with a period as small as one cycle. So the recloser can be set to start the tripping
command as long as it enables to flow through the sectionalizer one sinusoidal cycle in order to correctly measure the fault using its detection
algorithm.
The minimum opening time that the recloser is set to maintain the line deenergized after a fault during a reclosing cycle must be
set higher than 0,5 seconds in order to permit the wiAutoLink to perform the mechanical trip and safely isolate its connected faulty load and
isolate the fault from the other branches connected to the recloser.
Minimum Current - Time Requirement
20
40
Current [A]
Figure 40.
60
80
30 / 33
100
120
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