phase sequence??BUT HOW????? - Electronic Circuits Projects Diagrams Free

dolphin11 · 21st February 2005, 01:16 AM

no,i want measuare three phase if three phase is not correct direction, pic will be turn off the led(0) direction of three phase is correct pic turn on the led(1)
how can find right direction of three phase of line ???

**mechie** · 21st February 2005, 10:09 AM

A program something like this ?

Code:

TestRed
        Test RED phase - is it high? (this is my ref. point)
        - - If NOT goto TestRed
        Wait for 6.6mS (50Hz mains, three phase)
        Test YELLOW phase - is it high?
        - - If so then all is on track -- GOTO YelGood
        Test BLUE phase - is it high?
        - - If so then we are running backwards -- GOTO BluBad
        Signal that a phase is missing - GOTO TestRed

YelGood
        Wait for 6.6mS
        Test BLUE phase - is it high?
        - - If so then one phase complete -- GOTO SeqGood
        Signal that a phase is missing - GOTO TestRed

SeqGood
        Signal that all is well
        GOTO TestRed

BluBad
        Wait for 6.6mS
        Test YELLOW phase - is it high?
        - - If so then one phase complete -- GOTO SeqRev
        Signal that a phase is missing - GOTO TestRed

SeqRev
        Signal that phases are reversed
        GOTO TestRed

dolphin11 · 21st February 2005, 03:22 PM

thanx a lot
my second question is related my first question
which signal that i want to find direction of them
are over the DC signal
for waht!!???
beacause i convert the ac signal to dc but this dc voltage include ac riple as well as ....
on the other hand how i find when signal is start zero point because my pic initial with 4MHZ ...

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21st February 2005, 01:16 AM	#1
dolphin11	phase sequence??BUT HOW????? no,i want measuare three phase if three phase is not correct direction, pic will be turn off the led(0) direction of three phase is correct pic turn on the led(1) how can find right direction of three phase of line ???