Instrument transformers (figure 10) 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.
Figure 10 – Connections of Instrument Transformers
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.
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