Problem: ADE7758 takes measures reactive energy under resistive load

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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  • Hi Dlath!

    The load are two incandescent bulb lamps 150W each. I didn't measure the delay between the voltage and current yet but it should be cero as this kind of lamps are of resistive load only. So yes, I'm expecting only active power and then when knowing xWATTHR value find a WHR/LSB constant.

    About having a reference meter to compare, well, I have no one which I can use to compare the measures in the energy registers. But I have an osciloscope (with only one probe test lead) and a current clamp.


    Thanks for the response.  I'll try to figure out which PF I really have and the phase shift the CT sensor adds to my current signal maybe if that's the problem I could solve it as you say. Anyway, I'll let you know how I'm doing with this.

    Regards,

    Harry

Reply
  • Hi Dlath!

    The load are two incandescent bulb lamps 150W each. I didn't measure the delay between the voltage and current yet but it should be cero as this kind of lamps are of resistive load only. So yes, I'm expecting only active power and then when knowing xWATTHR value find a WHR/LSB constant.

    About having a reference meter to compare, well, I have no one which I can use to compare the measures in the energy registers. But I have an osciloscope (with only one probe test lead) and a current clamp.


    Thanks for the response.  I'll try to figure out which PF I really have and the phase shift the CT sensor adds to my current signal maybe if that's the problem I could solve it as you say. Anyway, I'll let you know how I'm doing with this.

    Regards,

    Harry

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