Definition of Instrument Transformer
Current Transformers (C.T.) Construction:
Working of a current transformer and C.T Ratio:
Potential Transformers (P.T) Construction:
A potential transformer has two winding's namely primary and secondary. Primary winding has large number of turns and it is connected in parallel to the line(between line and ground) whose voltage is to be measured. Now the secondary has less number of turns. This is usually rated to 110 V and is connected directly to voltmeter. Through this voltmeter we can note down the value of voltage across the secondary winding of potential transformer.Symbolic representation of a potential transformer is as shown in the figure.