7: Instrument Transformers

 Instrument Transformers

Instrument transformers (figure) are used for measuring and control purposes. 

They provide currents and voltages proportional to the primary. 

But there is less danger to instruments and personnel.

Those transformers used to step voltage down are known as potential transformers (PTs) and those used to step current down are known as current transformers (CTs).

The function of a PT is to accurately measure voltage on the primary, while a CT is used to measure current on the primary.