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POTENTIAL TRANSFORMER

 

Potential Transformer is primarily designed to check single and three-phase power line voltages in power metering and electrical instrumentation systems. Since it provides step up or step down voltage and current with electrical isolation, is effective in connecting electrical applications to high-voltage and high current power systems.
Potential Transformer has primary and secondary winding. The primary winding is precisely connected to the power circuit between two phases or one phase and the ground depending upon the grade of the transformer and requirement of the application.
A potential transformer is exclusively designed that permits the meter to take readings from electrical connections with higher voltage (potential) than the meter competent of handling the same without potential transformer.
The working principle of potential transformer is the same as of other transformers. It transforms voltages from high to low. A potential transformer functions for single and three phase technique and is attached at a position where it is suitable to measure the voltage.
Potential transformers provide precise voltages for meters suitable for billing applications for industrial business client or Companies. Potential transformers provide precise voltages for meters suitable for watt hour meters, demand meters, billing applications for industrial business client or Companies and are used as pilot devices for power factor meters, voltmeters and ammeters.
The potential transformers are used to scale down the line to neutral voltage of Wye system in which the voltage between any two wires permanently gives the similar extent of voltage on a three phase systems or, the line-to-line voltage of a Delta system to the rated input scale of the meter i.e. normally 120 V.