Potential Transformer is also known as Voltage Transformer. It consist of primary and secondary windings which are electrically isolated but coupled magnetically by a core. Their role in electrical systems is of primary importance as they “step down” the voltage of a system to measurable values, such as 110 V or 100 V, thus enabling Standardization of equipment.
Voltage Transformer Measurement For Metering:
A voltage Transformer with typical accuracy class: 0.1, 0.2, 0.5, 1.0 and 3.0 used mainly for measuring through meters and similar apparatus.
Voltage Transformer Measurement For Protection:
A Voltage Transformer with typical accuracy class 3P, 6P are used mainly for protection Relays.