Differences Between Instrument and Power Transformers
|Power Transformers||Instrument Transformers|
|1. Mainly used to change voltage levels in
a power system.
|1. Mainly used to extend the ranges of the
instruments while measuring parameters like
|2. They are required to transform huge amount
of power to the load.
|2. They are required to transform very small power
as their loads are generally delicate moving elements
of the instruments.
|3. They can be used to step up or step down the
|3. They are basically step down transformers and
used along with devices such as protective
|4. The exciting current is a small fraction of the
secondary winding of load current.
|4. As the load it self is small, the exciting current is
of the order of the secondary winding.
|5. The cost is main consideration in the design
while efficiency and regulations are secondary
|5. Accuracy is the main consideration while designing
to keep ratio and phase angle errors minimum.
Cost is the second consideration.
|6. As they handle large power, the heat
dissipation is the major consideration and
cooling method is necessary.
|6. The power output is very small as loads are light.
Hence heating is not severe.
|7. The limitation on the load is due to temperature
|7. Accuracy is the main load limitation factor and not
the temperature rise.
|8. Example : Distribution transformer used in
|8. Example : Current transformer and Potential
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