Test #1 Handout Mutual Inductance and Linear Transformers

ECEN 2633 – Test #1 HandoutMutual Inductance and Linear Transformers| |[( ) ( )] ( )Ideal Transformers√ ( )AC Informationv V m (ωt φ) fV ZI V eff ZI effTωπRectangular to Polar conversionV A jB √A B ∠− B A °Polar to Rectangular conversionV V m ∠φ° V m φ jV m φ(Note that V m is a magnitude and should be positive, thusangle needs to reflect the change)Complex Number IdentitiesjjjLagging power factor: implies that the current lags thevoltage – hence inductive loadLeading power factor: implies that the current leadsthe voltage – hence capacitive load

ECEN 2633 – Test #1 HandoutPhasor diagrams showing the relationshipbetween line-to-line and line-to-neutralvoltages in a balanced system. (a) The abcsequence. (b) The acb sequencePhasor diagrams showing the relationshipbetween line currents and phase currents ina -connected load. (a) The positivesequence. (b) The negative sequence.