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Isolation
Transformer
often
has
symmetrical
winding
which
is
used
to
decouple
2
circuits.
It
incorporates
a
full
metallic
shielding
(copper
/aluminum)
between
primary
&
secondary
winding
Isolation
Transformers
are
being
used
to
protect
electronic
&
sensitive
creative
equipment
such
computer
&
peripherals
medical
instruments,
digital
machines
&
CNC
M/C
from
the
Excessive
line
voltage
transient,
spikes/surges
which
produced
in
the
system.
Apart
from
this,
isolation
Transformer
also
obstructs
those
disturbances
that
are
generated
by
the
noisy
equipment
from
being
injected
into
the
power
line
i.e.
it
filters
common
mode
noise
usually
an
attenuation
of
approx.
30
db.
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In
Shielded
transformer,
4
low
impedance
path
Exist
for
noises
to
pass
to
secondary
&
vice
versa.
These
paths
are: |
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-
High
value
of
coupling
capacitance.
-
Maximum
leakage
of
magnetic
field.
-
Leakage
current
-
Static
transformers
of
electric
noise.
The
multiple
shielding
techniques
employed
in
isolation
Transformers
reduce
the
inter
winding
capacitance
below
to
0.005
Pico
farad
&
increase
D.C
isolation
to
over
1000
M
ohms.
Application
of
Isolation
Transformer |
•
Protection
of
microprocessor
based
Machines
from
Damage
&
data
loss
•
Where
ground
of
equipment
cannot
be
earthen
•
When
no
current
leakage
is
permitted
in
equipment
•
When
protection
is
needed
against
high
frequency
line
losses
&
strong
surges.
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