Potential transformer is an instrument transformer used for protection and measurement purposes in power systems. potential transformer is mainly used to measure high alternating voltage in a power system.
Potential transformer is similar to a transformer, but the purpose of the voltage transformer to transform the voltage is mainly to supply power to the measuring instrument and the relay protection device, so as to measure the voltage, power, and electric energy of the line, or to protect the valuable equipment in the line when the line fails, motors and transformers. Therefore, the capacity of the voltage transformer is very small, generally only a few VA, tens of VA, and the maximum does not exceed one thousand VA.
