I'm sorry I haven't been following this thread. But a pretty simple and
reliable (I think) method of detecting a phase loss on a 3 phase wye
connection is to just have three resistors from the three phases to a
common. Measure the voltage between neutral and common. It is ideally
zero. Loss of a phase will make it substantially away from zero.

Harold


>
> ----- Original Message -----
> From: "alan smith" <micro_eng2@yahoo.com>
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
> Sent: Tuesday, January 09, 2007 12:07 AM
> Subject: RE: [PIC]: Phase failure detection
>
>
>> 1-off project?  'They' make phase monitoring relays, but maybe they
>> don't
>> do what your after.
>>
> No; hopefully, if people like the demo it would go into small scale
> production.
>
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