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User Manual LineTroll R400D
4. Fault detection
The aim of this section is to describe how the LineTroll R400D indicator behaves in different
service situations and network events.
4.1 Line switching
– inrush blocking
Magnetising inrush current of a line can be
very high, the indicator is provided with a
5 to 15 second inrush blocking (the time is
configurable) of the dB/dt sensor 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.
The same inrush blocking will prevent
indication in case of switching against a
fault.
t
t
LINE
I
NO INDICATION
4.2 Faults
Permanent fault
Permanent faults will be indicated by
strong red strobe flash.
The time-out for the indication can be set
by the user in the interval 1.5hour to 12
hours.
If the line is restored within the time-out,
the LED’s will reset, assuming that the
voltage reset is enabled
Fast Auto
Reclosing
Last
Reclosing
Non-successful
Fault
40 to 300 sec
5 to 15 sec
SMS with ’Permanent
Fault’
Permanent Fault
D4
When a second fault occurs while indicating the previous fault
If a second fault occurs whilst the LineTroll R400D is indicating a previous permanent fault the
indicator will continue to indicate the first fault. The indicator must be reset before it can
detect the next fault while indicating a permanent fault.
