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#23914 - 03/30/03 10:13 AM three phase power
hisham Offline
Junior Member

Registered: 03/30/03
Posts: 1
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

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#23915 - 03/30/03 01:04 PM Re: three phase power
Ron Offline

Registered: 03/13/02
Posts: 577
Loc: White Plains, NY
Go to a search engine like and type in "phase rotation meter", and stand back for the huge # of hits.

#23916 - 03/30/03 04:03 PM Re: three phase power
Bjarney Offline

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
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.

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


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