Instrumental Transformer:
The instrument transformer are
special type of transformers these transformers are defined as the transformer
intended to supply measuring instruments, meters, relay and other similar
apparatus.
In the measuring large current in a
do circuit current and voltage is measured by using low range ammeter with a
suitable shunt. For measuring high voltage high resistance is used in parallel.
For AC circuit capacities especially
for high voltage measurement the simple instruments are not suitable as these
are designed for low voltage. Also high rating instruments are not suitable on
the economic point of view.
The measurement of these numbers is
done with special device known as instrument transformers. These transformers or. transformer lamination manufacturer steps down current and voltage in definite
proportion. This reduced quantity is measured with the help of low range
ammeters and voltmeters and are then changed to actual value by knowing the
transformation ratio of the transformer.
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