Hello,

I am working with an ADE7880 and set to 3-phase, 4 wire configuration. I set to use the Regular accumulation mode.

Here is the settings is 50Hz and 240, 100 meter

CT turns ratio = 1:5000 = 1/5000 = 0.0002

Burden = 13.2 ohms , ADE fs I/P(V) = 0.5 volt

Voltage divider = 1096k = 1096000

Ifs = 0.5 fs *ct ratio/(R1+R2 x1.414) = 133.9 A

Like that Ufs = 387.8 v

Vn = 240 v

Based on above value i calculate VLEVEL = 6464134

WTHR = ?

Now i set WTHR = VARTHR = VATHR value = 0x03(default value) like that

LCYCMODE = 0x40

CFxDEN

MC = 1600 and n= -3 (fixed it) n - how calculate it ?

CFxDEN= 6250

COMPMODE = 0x3FF

I successfully get the Current, Voltage, V = 238.7 ,I = 2 ams and But when PF = 1 i Read watt value from reg. xWATTHR = 535 and PF = 0.5 watt value xWATTHR= 170 like that is correct value? Please help me ?

Hi,

I took a spreadsheet we put together to calculate the ADE7880 registers (attached) and I introduced your data. I chose to use two burden resistors in the current transformer circuit (you seem to use only one), similar to what we have in the ADE7880 evaluation board (UG-356, page 4, figure 3).

Please take a look for the values you were searching.

LCYCMODE=0x40 means you do not use line cycle accumulation. This means you have a timer in your microcontroller that dictates the accumulation time and the moment in which you read the ADE7880 energy registers. What time interval you use to read the xWATTHR registers? Please use the spreadsheet to calculate the expected xWATTHR value (location D32). The spreadsheet uses the line cycle accumulation to provide these values, but you can set an equivalent of LINECYC value equal to the time interval you use. For example, for 1s, at 50Hz, LINECYC=100, because there are 100 half line cycles of 50Hz in one second.

When pf=0.5, you can calculate the expected energy value by introducing 0.5 in location D30.

COMPMODE=0x3FF means you measure the angles between voltages and you include all phases in the CF1, CF2, CF3 pin calculations.

Keep me posted on the progress

Petre