Phase monitoring design Require

There are many ways to do this.

I would approach the problem like this:

three zero-crossing detectors
timers to measure the time period from phase A to B and B to C
logic to interpret the time period data

Thanks for your reply.Please suggest me the better one and if you have pls provide the schematics / links.

Hi,

We need to monitor the phases in 3 phase line(230V ac,50 hz). Because we need to check weather all phases is good / Phase failure / 2 phases having same phase angle.
Please help me to design the circuit for this.

(I need to detect an OPEN Phase or phase to phase SHORT fault on 3 Phase supply input. I need to send status signal to microcontroller if I detect any of following faults.
OPEN Phase - A
OPEN Phase - B
OPEN Phase - C
Phase A to B Short
Phase B to C Short
Phase C to A Short )


Regards,
Naveen K

The block diagram I described should be enough to get you started. Looking on-line or in books you can find the appropriate circuits.

This is an AC line voltage circuit and skill and experience in designing and building such circuits is needed if it is to be more than a paper design. The voltage rating of components, using safety rated components where appropriate, leakage current, creepage, clearance, and insulation coordination are needed to build this properly.

If you are going to install this I suggest purchasing a unit. A google search shows many such units.

Please provide the block diagram so that i can get bit idea for this.