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Electrical Applications 2 by David W. Tyler

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Transmission
and
distribution
of
electrical energy
7
Fault finding Overhead lines
are
patrolled regularly
on
foot
or by
helicopter.
Broken insulators
can be
seen
and by
using infra-red detection
equipment local
hot
spots
can be
found possibly
in
compression
joints where two lengths of conductor have been joined. Repairs are
reasonably cheap since
the
line
can be
taken down, insulators
replaced, joints remade and towers repainted
at
almost any
time.
If
an underground cable develops
a
fault electrical methods have to be
used
to
locate
it.
Unless
the
route
<