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Three-phase AC power supply phase sequence detection circuit
Source: InternetPublisher:石榴姐 Keywords: AC power supply phase sequence detection three-phase AC power detection circuit Updated: 2021/08/18
It uses light-emitting diodes VLi~VL3 as display components. The function of the voltage regulator tubes vSl and
VS2 in the figure is to increase the identification voltage to prevent erroneous display due to unbalanced three-phase power supply voltage.
When the three-phase power supply is in forward phase sequence, the yellow, green and red LEDs VLi~VL3 light up; if it is in reverse phase sequence.
VLi~VL3 goes out.
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