From the course: Electrical Systems: Panel Boards, Frequency Drives, and Transformers

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Transformer math/calculations

Transformer math/calculations

From the course: Electrical Systems: Panel Boards, Frequency Drives, and Transformers

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Transformer math/calculations

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- [Instructor] Let's try our hand at some of the math that is used when calculating the size of a transformer or the amount of work a transformer can do. First of all, you should understand the transformers are normally sized in kVA, or kilovolt-amps. It's a unit of measurement that reflects the amount of work a particular piece of apparatus can accomplish. K, in this instance, stands for the number 1,000. V stands for system or circuit voltage. A stands for system or circuit amperage. To determine KVA you must have at least two other pieces of information, the operating system voltage of the transformer, V, and the maximum load amperage, A. To calculate the kVA rating of a single-phase transformer use the formula kVA equals voltage times amperage divided by 1,000. To calculate the kVA rating of a three-phase transformer use the formula kVA equals volts times amps times 1.73 divided by 1,000. Remember, transformers are made in standard kVA sizes. So once you determine the kVA size…

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