POLYPHASE AC CIRCUITS


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POLYPHASE AC CIRCUITS
POLYPHASE AC CIRCUITSA polyphase ac circuit consists of two or more circuits that are usually interconnected and so energized that the currents through the separate circuits and voltages have exactly equal frequencies but differ in phase. A difference in phase means that the voltages do not reach peak positive or peak negative values at the same time. Also, the corresponding values of current are usually separated by an equal number of degrees. For example, in a three-phase ac system, no. 1 phase will reach a peak voltage 120° before the no. 2 phase, the no. 2 phase will reach the maximum positive voltage 120° before no. 3 phase. Thus the three phases are separated by an angle of 120° (
Citation
Thomas K. Eismin: Aircraft Electricity and Electronics, Sixth Edition. POLYPHASE AC CIRCUITS, Chapter (McGraw-Hill Professional, 2014), AccessEngineering Export