Phase sequence indicator


Posted on Nov 20, 2012    9770

Simple, portable phase-sequence indicator determines the proper phase rotation in polyphase circuits. Major components are two neon lamps, two resistors, and a capacitor. In operation, the leg voltages are unbalanced, so that the lamp with the maximum voltage—or proper phase sequence—lights

Phase sequence indicator - schematic

Table shows typical component values for various circuit frequencies.

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