Linetroll 110Tµr Overview; Functional Description - Nortroll LineTroll 110Tmr User Manual

1. LINETROLL 110Tµr
OVERVIEW
The LINETROLL 110Tr is a line
mounted fault indicator for local and remote
indication.
The LINETROLL 110Tr has an
integrated radio that can communicate with a
pole-mounted Nortroll Collector device
(CmT 115C or others). The Collector can be
interfaced to a SCADA-RTU or a
communication device by means of dry relay
contacts or serial-port for remote indication
of faults..
The LT 110Tr is a single phase unit,
however they are normally used in groups of
3 to fully cover the different fault
configurations which can occur. Deliveries
come as a kit of 3 units to each package.
The LT 110Tr Fault Passage Indicator;
detects down-streams faults in the OH-
distribution network. Detectable faults
include short circuit and earth fault, if the
network provides sufficient earth fault
current.
The indicators are placed at strategic
locations along the line, such as after
branching points and sectionalisers. The
indicators mount directly on the high voltage
conductor.
Live line mounting is easily and rapidly
done with a shotgun type Hot-Stick.
Upon fault sensing, all indicators installed in
the faulty phase(s) between the feeding
substation and the fault will operate. The
indicators placed behind the fault or in the
non-damaged phase(s) remain idle.
Upon detecting a fault on the line, indication
is by means of an intermittent LED- flash (1
super intensive red LED's for a permanent
fault and 1 regular Green LED for transient
faults).
The LED-flash can be seen within 100-200
metres distance. The lens of the indicator
allows for uniform 360 degrees monitoring.
LineTroll 110E/110Eµr User Guide September 2009
LINETROLL 110Er provides fast fault
location through remote indication, enabling
reduction in outage times. This represents
enhanced service to the customer thereby
improving the utility image.
Another important aspect of using fault
indicators is that unnecessary operations of
circuit breakers and sectionalisers to locate
faults can be avoided. In this way the
indicators can help to reduce wear and tear,
as the reclosing cycle can cause stress to
switchgear.

2. FUNCTIONAL DESCRIPTION

The LINETROLL 110Tr continuously
monitors the line voltage and phase current,
the two sources of information it needs to
operate. The unit is fully self contained, no
external transformers or connections are
required.
During normal line conditions; the indicator
does not flash.
The device is looking for a specific sequence
of line conditions to occur before it starts
indicating locally and remotely. The general
sequence is as follows:
A. The line is energised (voltage or current
present) for at least 5 seconds.
B. The line current increases
instantaneously by a user defined set
value (the step level), or exceeds a user
defined threshold value (if enabled).
C. The line is de-energised. Voltage or
current not present (optional auto reset
when the line is re-energised)
The user can program the criteria for
operation to suit his local requirement by
manipulating a bank of micro-switches
inside the indicator.
Note: Voltage or current present as start
and stop criteria is user programmable.
Page 3 of 16