Instrument Transformers

Instrument Transformers Points : instrument transformers, what is instrument transformers Instrument transformers are used in a.c. systems for the measurement of current, voltage, power and energy. They are also used in connection with measurement of power factor, frequency and for indication of synchronism. These transformers find a wide application in protection circuits of power systems for the operation of over current, under voltage and various other types of relays.

In all the above applications, the transformer is put for measurement purposes, the actual measurements being done by measuring instruments. Transformers used in conjunction with measuring instruments for measurement purposes are called “Instrument Transformers”. The transformer used for measurement of current is called a “Current Transformer” or simply “C.T.” The transformers for voltage measurement are called “Voltage Transformer” or “Potential Transformer” or simply “P.T.” in short.