Three Phase Transformer - Basic Calculations

Guide book that accompanies our YouTube tutorial on 3 phase transformer calculation basics. This 27 page guide book includes detailed illustrations, step by step calculations, worked examples and common formulas for different transformer configurations.

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We explain how

• Wye configuration provides 120/208V or 277V/480V

• How delta provides just 480V

• How high leg delta provides 240V/120V/208V

• How open delta provides 240V/120V/208V and how the capacity is reduced for the rated kVA as well as compared to full delta bank kVA

Worked examples for:

• How to calculate wye line to line voltage using trigonometry,

• How to calculate the line wye line voltage from the sine waves between phases,

• How to calculate the line current for a delta configuration using trigonometry

• How to calculate the high leg voltage using trigonometry

Formulas provided with worked examples for:

• Wye - phase voltage, line voltage, phase current and line current

• Delta - phase voltage, line voltage, phase current and line current.

• High leg delta - phase voltage, line voltage, high leg voltage, low leg voltage, phase current, line current,

• Open delta - phase voltage, line voltage, high leg voltage, low leg voltage, phase current, line current