Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

phase sequence
describes the rotational orientation of the voltage phasors in a 3phase electrical power system.
A positive phase sequence, designated by the nomenclature ABC, indicates a 3-phase connection in which the B phase voltage lags the A phase voltage by 120 degrees, and the C phase voltage leads the A phase voltage by 120 degrees.
A negative phase sequence, designated by ACB, reverses this relationship so that the B phase leads the A phase, and the C phase lags the A phase.
See phase sequence indicator
phase sequence indicator
device used to detect the phase sequence of a 3-phase electrical power system.
See phase sequence
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