Voltage Transformers are used for metering and protection in high-voltage circuits. They are designed to prevent negligible load to the supply being measured and have an exact voltage ratio to accurately step down high voltages so that metering and protective relay equipment can be operated at a lower potential. Voltage Transformers are used with grounded (3-pin) appliances and can be used with both "electric" and "electronic" appliances. They can be used continuously for long periods of time and at higher wattages.
There are low voltage transformers (Step Down) and high voltage (Step Up) transformers. While the former are used to step down voltage and convert it from 220V to 110V, the latter function by stepping up voltage and converting it from 110V to 220V. Some transformers are dual voltage also.
If you are thinking of buying a voltage transformer, the following tips will help you select the right transformer for your appliance:
- Determine if your appliance actually requires a transformer. Look for the voltage rating on the appliance; if the rating states something similar to 100Vto 240V that means your product is dual voltage. In such a case you can use your product in a 220V without a transformer. If the voltage rating is 110V or 120V, it means that your product is only single volt and will require a step down transformer for use in 220V.
- Once you know that you require a voltage transformer, you need to determine the right kind for your product. Look for the watt rating on the appliance or calculate wattage by multiplying voltage x amps. Select the transformer according to the wattage rating of your appliance. It is better to use a transformer that is rated at least 25% higher than your product's wattage rating.
- After selecting the right transformer, make sure that you have the proper plug adapter on the transformer.
- Always buy voltage transformers and adapters from a reputed source only.
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