Phase sequence indicator

Posted on Nov 20, 2012

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
Click here to download the full size of the above Circuit.

Table shows typical component values for various circuit frequencies.

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