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ADE7878 - phase fail detection (SAG and/or ZX ?)

Question asked by Martin1978 on May 11, 2015
Latest reply on May 12, 2015 by hmani

Dear all,

 

I have been trying to figure out a way to detect a phase voltage fail  (within a couple of cycles) with ADE7878 SAG and/or ZX events .

These are my findings (please correct me if they are incorrect):

 

- SAG detection is usefull if the end voltage is different than near zero; for instance, if 2 phases are already down, the fail of the third will not have ZX detection for counting the timeout cycles; For slow decaying voltages, the SAG works great.

 

- ZX missing timeout event (or generally all ZX events) is (are) inhibited when the voltage is below 10% full scale.

 

Is there any obvious way to implement a phase fail detection considering the above limitations?

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