Dear,
All the links are related to AC Pwer measuring & dc voltage & current display. But my concern is dc power measurement. Pl guide in this regard by using 51micro core.
Thanks for your response. I want to draw your attention to below point also:
If Instantant Voltage & current is multipilied then output will be instant power. But i have to measure enegy consumed for 1 month. Below formula can give the desired output:
Consumed Energy (30days)=[(P1+P2..........P3600)/3600]*24*30KWH
Where P1=Measured Power after each second
My concern is accurecy with this process as i dont know what will be the practical impact of the same path.
sample input current and voltage and convert synchronously into digital. multiply them and then make a low pass filtering on them to get the dc power(the cut-off of this filter should be your harmonics frequency u want to measure), then convert this number into BOT. Thingsa are not so simple. See analog devices energy metering systems to get a full overview. Lot of other thiongs are required to consider. metering standard itself is critical and u need to meet them (the converter itself should be a sigma delta....means u are gone ). I have practical experience on this thing and i know it is not so easy
Thanks Sumit.....
I have seen aanalog device ICs and no doubt, there are so many parameters to be considerd. But again my point is that all the parametrs are required for DC Power measuring also or not. We can use the Analog Device ICs for this application or it can be done only by Micro. Can u pl share your practical experience with me.
If Instantant Voltage & current is multipilied then output will be instant power. But i have to measure enegy consumed for 1 month. Below formula can give the desired output:
Consumed Energy (30days)=[(P1+P2..........P3600)/3600]*24*30KWH
Where P1=Measured Power after each second
My concern is accurecy with this process as i dont know what will be the practical impact of the same path.
Instant power / 3600, next second do the same thing. You will be integrating the power. When the reminder provides you a 1 as reminder increment UNITS counter. You will get energy in UNITS consumed.
Thanks Mr. Ravimarcus,
I already taking this one in same way but my worry is for taking accurecy. Have you done this type of project. Pl share some practical views.
In one project, I was receiving 4-20mA and I was integrating this.
In the second project, I was multiplying voltage and current resulting in instant power. I was integrating and producing UNITS.
For example
In the 1st sample, you will get a Pi of 2400. Divide this by 3600, you will not have any carry. Retain 2400.
In the next sample, you will get a Pi of 2400. Add the retained 2400 to the current sample. You will get 4800. Divide this by 3600. You will get 1 and a reminder of 1200. Retain this for the next sample.
The 1 is the UNITS.
The accuracy will depending on your 1 second sampling.
Pl clarify below also:
1) I couldn't understand the above line exactly.
2) What are your views abt sumit_techkgp reply as posted earlier.
3) Is it possible with 8 Bit Controller to complete this type project while enrgy storage for 1 month wil be app. 7000.000KWH.
He has a point there, but too many conversions will result in losses. In any design, at the earliest, convert the analog data to digital and then play with the values, This way there will be no drift and more inaccuracies.
mak_goel said:
3) Is it possible with 8 Bit Controller to complete this type project while enrgy storage for 1 month wil be app. 7000.000KWH.