Chapter 4 Single-Phase Isolation Transformers

Transformer

is a magnetically operated machine that can change values of voltage, current, and impedance without change of frequency

3 classifications

isolation, auto, current

Mutual Induction

one coil inducing voltage in another

Isolation transformers secondary winding is _____ and _____ isolated from the primary winding

physically, electrically

Line isolation

reduces voltages spikes and separates electrical components from ground

step up transformer

secondary is lower than primary

step down transformer

secondary voltage is lower than primary

Excitation current

the amount of current required to magnetize the core of the transformer

All values of a transformer are proportional to its turn ratio T/F

true

Distribution transformers are a common type of isolation transformer T/F

true

Metal core provides good magnetic coupling T/F

true

Neutral conductor, ground center tap; divides voltage equally between two lines of secondary T/F

true

laminating core reduces power losses due to eddy current induction T/F

true

power must be equal out T/F

true

Control Transformer common industrial transformer T/F

true , 2 primary 1 secondary

Self Induction

when a coil induces a voltage into itself