hi can anyone help me in designing a circuit for phase reversal detection in 3 phase system.
i mean to protect a system in RYB is reversed or interchanged
Lets take the red phase and half wave rectify it, now we have a series of pulses at 20 mS intervals(20 mS = 1/50HZ). Lets pretend that your Yellow phase should occur 6.66 mS later (20mS/3). Likewise the Blue phase should be 13.3 mS later. So you can run a timer triggered by the red phase that samples the yellow phase at 6.6 mS, if there is a positive voltage - good!, and also a 13.3 mS timer to check for blue phase voltage.
Frank
i can use a microcontroller in the design. instead some logic gate may be used. let me try to work out some logic for that.
i was hoping there was some analog method to do this