![]() Our transformer technicians drive us to the forefront of transformer design and manufacturing in the UK. Our technical team can design and build transformers for unique applications. We manufacture custom built transformers for a variety of applications. We aim to produce the most efficient and cost effective solution for your specific transformer requirements. ![]() From design through to installation our team are here to help. R Baker (Electrical) Ltd have an in-house engineering team readily available to work with you. There are many useful tools online to aid you with transformer rating and design, here is a useful link Transformer Basics How can we help? Volts x Amps / 1000 = _ KVA Three phase transformer Line Voltage = _ Single phase transformer ![]() Load Current/Amps = _ What is the Line Voltage (For three phase applications) Load Voltage = _ What is the Load Current (Amps) Transformer Formulas What is the Load Voltage The kVA rating will also be affected by the application of the load, for example motors may need an increased kVA rating. It is advised that the kVA of the transformer should be equal to or greater than the rating of the load to handle present requirements. Depending if the application is three phase or single phase, this will determine which formula to use. When sizing a transformer it is important to determine the application. There are a few different formulas which can be used to determine the size of a transformer. The Current that passes through transformer windings will determine the Copper Losses, whereas Iron Losses, Core Losses or Insulation Losses depends on voltage. For example a 1KW (1000 Watts) load would require a 1kVA transformer unity power factor. In many circumstances the power required by the load is equivalent to the rating of the transformer expressed in either VA or kVA. The size of a transformer is determined by the kVA of the load. ![]() KVA stands for Kilovolt-Ampere and is the rating normally used to rate a transformer. ![]()
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