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User Manual LineTroll R400D
2. Functional Description.
LineTroll R400D base the fault sensing on detection changes in the electromagnetic field
below the conductors.
The unit is fully self-contained, no external transformers or connections of any kind are
required.
The indicator is looking for a specific sequence in the line conditions to happen before it starts
indicating a fault and send the alarm to the control center. The general sequence is as
follows: (ref. fig.2)
1. The line should be energised for at least 5 seconds. (Inrush blocking time is configurable)
2. The line current should increase rapidly above the value set by the user (the nominal trip
level).
3. The line should be de-energised.
Figure 2. Fault sequence.
I
nom
Line
Energized
Fault
Occurs
B LOCKE D
REA DY
15 /30 s ec
INDI CATI ON
RES E T /
REA DY
Line
Energized
DET ECTI ON
t
LI NE
CURRENT
I
trip
5-15 s ec
INDICATOR
t
Send
Alarm
Send
Reset
