Dear Sir / Madam,

We use ADE7880 Applied to the three-phase three-wire delta wiring ( 2CT connected ), but the test has encountered several problems, please help us :

- 1. We want the angle between Voltage，But only get numerical on Angle0 . But Angle 1 and Angle 2 are “0”. ( Set COMPMODE = 0x 43FF ), Why we can't get numerical on Angle 1 and Angle 2 ?
- Set COMPMODE 0x 45FF，measure the angle between Current , But the result is the same.
- I want to determine three-phase total power factor is capacitive or inductive, what to do?

Thank you.

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Tsai

Hi Tsai

How have you connected ADE7880 in delta mode? I am assuming you have grounded Phase B and you don't have any signal entering the Phase B inputs of the IC. Is that correct? Then, Phase B voltage and current will not have any zero-crossings to measure and hence computing angles with reference to Phase B will not be useful. However, I would assume the angle between A and C would be the one of interest to you in this mode anyways. Do you agree?

page 15 of the AN639 app note should provide an overview of how to connect the ADE IC in delta mode.

Also, what value do you write to the CONSEL bits of the ACCMODE register? Set it to 0b'01. In a 3-phase delta system, what is your intended formula for computing total PF?

Regards

hmani