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4. APPLICATION NOTES
The aim of this section is to describe how
the LINETROLL 110E indicator behaves
in different service situations and network
events.
4.1. Energising a healthy line
As the magnetising inrush current of a line
can be very high, the indicator is provided
with a 5 seconds blocking which prevents
it from being activated until the line current
is stabilised. Once the blocking time has
elapsed, the indicator is enabled for fault
detection.
See Figure 5.
.
Figure 5: Criterion of the blocking time.
a) shows the sequence when a fault occurs less
than 5 sec after line has been energised:
No Indication.
If, upon re-energising of the line, the unit is
indicating due to a previous fault, the unit
will reset if the voltage- or current reset
option is enabled, but even in this case the
indicator will flash for 30 seconds
(depending on the programming, see 4.7)
before finally extinguishing. See Figure 6.
LINETROLL 110E /110Eµr User Guide February 2010
Figure 6: Delayed reset of flashing.
4.2. Connecting a faulty line while the
indicator is activated
Closing a breaker onto a fault leads to
another trip almost instantly.
As the activated indicator needs 30 seconds
with the line energised in order to reset, it
will continue indicating.
See Figure 7.
Figure 7: Reclosing upon a faulted line.
Page 7 of 16
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