Testing A Transformer The Right Way – Miracle Electronics

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Lighting surges, short circuits, overloading,
loose connections are just some of the most
common failures seen occurring in transformers
you may experience a lot more if your
transformers arent built right and to avoid
such catastrophes, it is crucial that the
transformers are thoroughly tested before being
used.
While there are a variety of different types of
transformers available, the basic construction
of any kind of transformer involves two coils
wound together on a core made of either iron or
ferrite with the main function being to alter
the AC current and voltage. Because of such an
intricate purpose being solved with a
transformer, you would certainly approach a
reliable and trusted transformer manufacturer in
India to have your transformer build. But, you
should be certain that the transformers are not
only built, but also tested before being
delivered to you. How Are Transformers
Tested? Winding breakdown test If a very high
voltage or current passes through the coil, the
circuit may break down due to the heating up of
the winding. To check for such winding
breakdowns, AC voltage is first applied to the
primary winding. In case of low or zero voltage
from the secondary, an opening of the winding is
indicated.
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Ringer test To check for any shorts, a ringer
test is performed. The most cost- effective
ringer test is the LOPT or FBT tester, which can
instantly tell the results on the bar graph by
connecting its probes to the primary winding. A
4-8 reading indicated full winding, while a 1-3
reading signifies partial shortening. A complete
switch off means heavy shortening in the
coil. Megger test This test is used to
determine the quality of insulation within the
transformer, which is performed with the help of
a megohmmeter. The insulation of the transformer
must be determined to have a greater resistance
than defined by international standards. Any
lower than the required measurement signifies an
issue with the insulation, which then requires
replacement. Power factor test This process
involves the testing of the power loss of the
insulation system, which is done by measuring the
power angle between an applied AC voltage and
the resultant current. The angle of the current
should measure 90 degrees the closer to 90 that
the current is, the better the insulation is.
Using a power factor test kit to regularly test
the transformer from time to time can help
detect deteriorating or malfunctioning
insulation, giving you an idea of when the
transformer will need to be replaced. Resistance
test This test checks for any differences
between the opens and windings within the
transformer with the help of an ohmmeter,
ensuring that all the circuits are still wired
and connected correctly. Repairing a transformer
is not easy, and requires a good amount of
knowledge and skill, which is why you need to
approach a reliable and professional transformer
manufacturer in India like Miracle Electronics,
to have your transformers built, wherein the
equipment is not only built, but also thoroughly
tested.