A Brief Introduction to Transformers

A Brief Introduction to Transformers ECE 201 Circuit Theory 1

Transformer Construction ECE 201 Circuit Theory 1

Three-Phase Transformer ECE 201 Circuit Theory 1

Transformer Action -- DC ECE 201 Circuit Theory 1

Opposes battery voltage Opposes flux buildup ECE 201 Circuit Theory 1

Transformer Action -- AC ECE 201 Circuit Theory 1

ECE 201 Circuit Theory 1

Voltage ratio = Turns ratio ECE 201 Circuit Theory 1

“No-Load” Condition ECE 201 Circuit Theory 1

“No load” condition continued Io = Ife + IM Io = exciting current Io provides the “magnetizing flux” and the “core loss” Ife = core-loss current Ife = VT / Rfe IM = magnetizing current IM = VT / jXM ECE 201 Circuit Theory 1

Component Fluxes – Loaded Transformer ECE 201 Circuit Theory 1

ΦP = net flux in window of primary ΦS = net flux in window of secondary Φlp = leakage flux of primary Φls = leakage flux of secondary ΦM = mutual flux ΦP = ΦM + Φlp ΦS = ΦM – Φls ECE 201 Circuit Theory 1

A Brief Introduction to Transformers

A Brief Introduction to Transformers

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