What is CT and PT ?

The term C.T means the current transformer, and the term P.T means potential transformer. In-circuit where measurements of high voltage and high current are involved, they are used there. Electrical Interview Page | 2 Particularly when a measuring device like a voltmeter or ammeter is not able to measure such a high value of quantity because of the large value of torque due to such high value it can damage the measuring device.so, CT and PT are introduced in the circuits. They work on the same principle of a transformer, which is based on the linkage of electromagnetic flux produced by primary with secondary. They work on the ratio to which they are designed. E.g. if CT is of ratio 5000\5A and it has to measure the secondary current of 8000A.then ANS=8000*5\5000=8Aand this result will be given to ammeter .and after measuring 8A we can calculate the primary current. The same is the operation of PT but measuring voltage.