Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

phase shift
a time displacement of a waveform with respect to another waveform of the same frequency.
phase shifter
a device that changes the phase angle between two buses in a power system. Conventional phase shifters are special autotransformers in with each phase voltage in connected in series with a variable component of voltage from another phase.

By adjusting the variable component, the phase angle can be changed. Newer phase shifters are built with power electronic devices. Phase shifters are often used in antenna arrays.
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