| Excellence
in
Innovation
J.
S.
Hansom
Pty
Ltd
will
always
accept
a
challenge,
particularly
when
it
comes
to
solving
problems
for
specialty
applications.
In
1992
we
were
approached
by
Nu
Lec
Pty
Ltd
to
supply
Partial
Discharge
Free
Resin
Cast
Voltage
Transformers.
The
scope
of
the
work
was
to
manufacture
11KV,
22KV
and
33KV
V.T’s
which
would
sit
inside
vacuum
reclosers.
J.
S.
Hansom
Pty.
Ltd.
was
the
only
company
that
could
provide
a
resin
cast
voltage
transformer
that
was
stable
under
extreme
conditions
of
+70oc
to
-40oc
cycled
twice
per
day.
These
transformers
are
still
in
service
worldwide.
In
1997
J.
S.
Hansom
Pty.
Ltd
manufactured
a
High
Voltage
Resonant
Test
Set
for
Transgrid.
This
unit
was
to
be
used
for
age
testing
of
insulation
of
high
voltage
equipment
used
in
the
mining
industry.
The
aim
was
to
accelerate
aging
of
insulation
such
that
an
assessment
could
be
carried
out
on
the
materials
used
and
why
they
failed.
Our
company
was
asked
to
submit
an
11KV
Voltage
Transformer
along
with
9
other
local
and
overseas
suppliers
to
participate
in
this
test.
The
end
result
was
that
any
resin
cast
transformer
with
partial
discharge
levels
of
less
or
equal
to
50Pc
changed
over
an
equivalent
12
year
test
period
by
factors
of
10
to
15
times.
Transformers
with
greater
than
50pc
and
up
to
100Pc
failed
within
the
first
week
or
ended
up
having
>
1000Pc
to
5000pc
discharge.
The
only
unit
that
did
not
change
was
the
J.
S.
Hansom
Voltage
Transformer,
which
started
with
<1Pc
discharge
and
finished
with
<1Pc
discharge.
Indigo
Technologies,
a
company
that
provides
sustainable
air
emissions
solution
for
clean
coal
combustion
and
industrial
processes,
commissioned
J.
S.
Hansom
to
develop
a
high
voltage
D.C.
supply
to
drive
their
Bi-Polar
Agglomerator
for
their
Fine
Particle
Control
System.
This
6KV
20
pair
neutralizing
transformer
was
developed
by
John
Hansom
for
the
Electricity
Commission
during
the
seventies.
The
neutralizer
maintains
the
incoming
telephone
lines
to
the
same
power
station
earth
potential
during
a
major
phase
to
ground
fault.
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