Power Measuring!! Need Assistance
- From: "@donis" <adonis@xxxxxxxxxxx>
- Date: 12 Dec 2005 19:31:51 -0800
Hi Folks, Im working on a power meter design using the ADE7756 and
right now im working in the interfacing stage(taking the current and
voltage values) . My question is quite simple but right now im a little
bit confused. Im my country we use the North American 3-wire
configuration we have a Neutral , L1 and L2. From Neutral to ground
the voltage is 120VAC, L1 to L2 is 240VAC. I know that apparent power
equals S=VxI. So far so good with my concepts. My confusion is
regardings the power readings. IF I have a 120V load the current will
return thru the Neutral Wire. and if I have a 240 Load the current will
return thru one of the lines. My question is if I have both loads
connected(120V load and 240V) and S=VxI , what would be my total power
value? what voltage should I use for sensing this (120 or 240), what
would be the value of my current? would the current value be a
vectorial sum? . Please include any information that might help me in
my design. Thanks in Advance guys..
Regards,
Adonis
Electronics Engineer
DR
.
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