Sunday, 15 October 2017

INSTRUMENT TRANSFORMER /INTERVIEW QUESTIONS

By Ask Biomedical


*What do you mean by an instrument transformer?
Transformer which is used with measuring instrument is called instrument transformers. Instrument transformer is used as a protection circuit of power system for the operation of over current, under voltage, Earth fault etc.

*what are the types of instrument transformer?
there are two types of instrument transformer:
1. Current transformer- used to measure current
2. Voltage transformer - to measure voltage

*what are the Advantages of instrument transformer?
Advantages of instrument transformer are:
1. Instrument transformer s are moderate in size and used for 5A current and 100 to 200 V measurement.
2. Instruments using instrument transformer are low cost.
3. Replacement of damage parts is Easy.
4. The metering circuit is isolated the high voltage power circuit hence insulation and safety is assured for operation.
5. There is low power consumption in metering circuit.

*what do you mean by a phase Angel of instrument transformer?
The angle between secondary current and primary current of a current transformer is called phase angle of instrument transformer.

*what do you mean by transformation ratio of instrument transformer?
It is the ratio of primary winding current to the secondary winding current of an instrument transformer.

*what do you mean by Nominal ratio of instrument transformer?
It is the ratio of rated primary winding current to the rated secondary winding current of an instrument transformer.

*what do you mean by ratio correction factor of instrument transformer?
It is the ratio of the transformation ratio to the nominal ratio of an instrument transformer

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