a brief introduction to transformers

A Brief Introduction to Transformers

ECE 201 Circuit Theory 1 1

Transformer Construction

2ECE 201 Circuit Theory 1

Three-Phase Transformer

Transformer Action -- DC

ECE 201 Circuit Theory 1 5

Opposes battery voltage Opposes flux buildup

Transformer Action -- AC

prms p

E N tdt

srms s

E N tdt

4.444.44

E N f NE N f N

Voltage ratio = Turns ratio

“No-Load” Condition

“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 / jXM10ECE 201 Circuit Theory 1

Component Fluxes – Loaded Transformer

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

a brief introduction to transformers

circuit theory

magnetizing flux

net flux

transformer action

leakage flux of secondarym

leakage flux of primary

transformer construction

phase transformer

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