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# ADE7880 single phase three wire (AB line connect to meter actually)

Hello

Customer would like use ADE7880 for single-phase three wire (But Phase A & Phase B line connect to meter actually). The power environment is PhaseA and PhaseB (VAB=220V). But neutral wire will not input to meter (ADE7880). In other words, Only phase A and Phase B connect to ADE7880 (Fig. 1). Has any doc or reference schematics of ADE7880 for this connection? How to connect Phase A and Phase B to ADE7880?

Another question for Fig 2. the register of ADE7880 should have IA and IB ? But how to calculate VAB and IAB value or get these information by above meter setup? it is a little urgent and looking forward to receiving a reply. Thank you.

Fig,1

Fig 2.

BR

Patrick

Modify words
[edited by: patrickchen@morrihan.com at 3:57 AM (GMT -4) on 12 May 2021]
Parents
• Hi Patrick,

220 currents IABRMS = IARMS +IBRMS   no it does not.

Only common currents are 220    IABRMS=((IARMS+IBRMS) - (ABS(IARMS-IBRMS)))/2

110 currents IBRMS=IBRMS - IABRMS

110 currents IARMS=IARMS - IABRMS

XLSX

• Hello

Thanks for reply. Below is schematics and question. Could you help provide comments?  It is a little urgent and look forward to receive reply. Thank you. Thank you.

1. IC (channel C – ICN ICP) does not use
2. IN (Channel N – INN INP) does not use
3. VAB à what is the mean ? what define pin? VAP?
4. The our schematic is summarized below image

BR

Patrick

• Hello

Has any suggestion for above question? Thank you.

BR

Patrick

• Vab is the voltage from line a to line b  . you have Va connected to Vap   Van would be connected to VB

The ade7880 Vap and Van  would be measuring Voltage line A to line B

• Hello Dave

Thank you. So the schematics modify looks no problem. right? Thanks.

BR

Patrick

Children
• Couple of modifications

PSm0 pin should be tied high or mcu controlled.

I would add and RC to the reset pin for noise immunity.

the ADE7880 should have the pad under the part tied to gnd

Dave

• Hello Dave

Can you double check Vb location , which would be connected Point 1 or Point 2?

Please refer to below image.  If Vb would be connected Point 2, please tell us what do R263 function. Thank you.

BR

Patrick