ECN Forum Forums General Topics of the Trade General Discussion Area three phase power

Can any one help me find a circuit design that will allow me to :

1) detect phase sequence in a three phase AC circuit
2) use led to indecate the phase sequence.

Thank you

Go to a search engine like www.yahoo.com and type in "phase rotation meter", and stand back for the huge # of hits.

Here is one using incandescent lamps, including details on operating-mode impedances and phasors. You may be able to adapt it to LEDs. {Of course, LEDs are inherently DC devices and incandescent lamps don't care.} It is presumed that you are familiar with safe electrical practices in construction and use of the device. http://www.geocities.com/lemagicien_2000/elecpage/3phase/3phase.html

Keep in mind the design is very rudimentary, and unless powered from three healthy phases may give false readings.