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Problem: ADE7758 takes measures reactive energy under resistive load

Question asked by Harry077 on Apr 16, 2015
Latest reply on Apr 23, 2015 by Harry077

Hello!

 

I'm starting with the calibration process for the ADE7758 using line cicle mode with a 300Watts, 220V load (two incandescent bulb lamps 150W each). I tried different accumulation periods and I always get pretty similar WHR/LSB constants.

 

I noticed I should verify that the aparent energy accumulated was the same that the active energy and in result that was not the case.

 

A sample measure for phase A are these:

 

AWATTHR = 0xFE00 = 65024d

AVARHR = 0xFF8FFF= -28673d

AVAHR = 0x115FF = 71165d

 

At least, all the measure seem to verify S^2 = P^2 + Q^2, just a 0.14% difference. Hope anybody could guide me with this matter.

 

Thanks!

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