Specifying the Correct Transformer
Contact us if you have questions regarding performance, design or
installation. You can email questions to technical_services@
bemag.com
- Transformer size is determined by the kVA of the load.
- Load voltage, or secondary voltage, is the voltage needed to
operate the load. - Line voltage, or primary voltage, is the voltage from the source.
- Single-Phase has two lines of AC power.
- Three-Phase has three lines of AC power, each line 120 degrees out of phase with the other two.
- kVA is kilovolt ampere or thousand volt amperes. This is how transformers are rated.
NOTE: If motors are started more than once per hour, increase minimum transformer kVA by 20%. To determine the size of the transformer you need, use the chart at the right.
Transformer Selection Formula
- Determine the proper kVA based on the required load voltage, line voltage and load current.
For an example: Load voltage = 480 volts, Load current = 80 Amps and Line voltage = 208 volts.
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_________________________ - Choose the appropriate style of transformer for the application. For example, if you need a transformer for a three phase industrial application you can choose the Three Phase Ventilated style.
- Find the appropriate section in the Product list.
- Select the options such as mounting brackets to assist your installation.
