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Potential Transformers
Potential Transformers are step down transformer.
Potential transformers are used to step down the voltage rating because lower voltage rating can only be allowed to pass through voltmeter for measurement purposes. Principle of Potential transformers are same as that of current transformer. Potential transformers are usually shell type transformer and do not differ much from the ordinary two-winding transformer, except that their power rating is extremely small.
| Voltage Range | Type of Transformer |
|---|---|
| 5000 V | dry type transformer. |
| 5000 V to 13800 V | dry type or oil immersed Transformer. |
| > 13800 | Oil immersed transformer |
For safety purpose, the secondary winding of the potential transformer is always grounded. Potential transformer is mostly used in mobile charger.
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