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Wye/wye primary neutral
With balanced load still has 3rd harmonic. 60hz × 3 =180hz.
Must be identical trans without PN
Wye/wye voltage
Primary line ex. 208= primary phase 208÷R3
Secondary phase ex 120
Secondary line=120 × R3
Wye/wye current
Primary phase current=transformer VA ÷ primary phase V
Same for secondary
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