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Fortunately, sizing your transformer is relatively simple. It involves using a straightforward formula to generate your kVA requirements from the current and voltage of your electrical load. In the guide to transformer kVA ratings below, we’ll explain in more detail how to calculate the required capacity kVA rating.
Standard KVA sizes are shown on the left margin, Standard Line-to-Line Voltages are shown along the top margin. Chart Example: Using the numbers from the earlier Three Phase Transformer Example V=208, I=175. Use the chart titled "Three Phase Low Voltage Dry Type Transformers".
Use our transformer sizing calculator to obtain the minimum kVA needed to power your load.
Transformers are sized by determining the total load required (in amps). Transformer capacity is rated in KVA (kilo-volt-amperes). The load voltage and load amps must be known to calculate KVA rating.
Here is a simple transformer sizing calculator, that can help you determine the required kVA rating of a transformer for a given load. Transformer size is calculated based on load voltage and load current.
This free online transformer calculator allows you to calculate the full load current in the primary and secondary transformer windings. The inputs are the transformer kVA (power), and the voltage in the primary and secondary windings.
We round this figure up to a standard Single-Phase size of 50 kVA (as shown in the chart below). 3-phase kVA calc: voltage X amperage X 1.732 / 1,000. 1-phase kVA calc: voltage X amperage / 1,000. Voltage and Amperes required by the load. Make sure the load is designed to run on a single-phase supply.
Here is a simple transformer kVA calculator, that can help you determine the required kVA rating of a transformer for a given load. Transformer kVA capacity is calculated based on load voltage and load current.
Select the type of transformer (single or three-phase). Input your load's current requirement. Input your load's voltage requirement. Our calculator will automatically output the minimum kVA rating for the transformer. Give it a try!
Transformer Sizing is the process of determining the appropriate transformer kVA rating for a specific electrical load. How do I calculate Transformer Sizing? Use the formula: Transformer_Size (kVA) = (Load (kW) + Motor Load (kW) + Lighting Load (kW)) / (Transformer Efficiency). Why is Transformer Sizing important?