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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
Member

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

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

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. 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.

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