How do i setup the tdk current transformers with the eval ade9000 shield board?

https://www.analog.com/media/en/technical-documentation/user-guides/ADE9000-UG-1098.pdf   pg 4

https://www.analog.com/media/en/technical-documentation/user-guides/ev-ade9000shieldz-ug-1170.pdf pg 7

Dave

Hi Dave!

Thanks for sharing the info and guidance. By calculating the resistors R1 and R2 at 5.1 against the CT what should I achieve? Should this be done during calibration or prior?

The current channel  ADC input is .707vrms  I would suggest half of fullscale or more for surge currents

if you have 15a and a 1000:1 ct 

(.707/2)(15/1000) = 23 ohms   I would divide this by 2 and use then as differential burdens as show in the diagrams I sent R1 and R2

Replace the values for your ct ratio  and current and  you can calculate the burden value you need. 

Dave

The current channel  ADC input is .707vrms  I would suggest half of fullscale or more for surge currents

if you have 15a and a 1000:1 ct 

(.707/2)(15/1000) = 23 ohms   I would divide this by 2 and use then as differential burdens as show in the diagrams I sent R1 and R2

Replace the values for your ct ratio  and current and  you can calculate the burden value you need. 

Dave

Hi Dave,

The nominal ct ratio is 3000:1, so I should calculate accordingly as per your guidance, correct? Thanks

(.707/2)(15/3000) = x

What is your max current? Replace 15A with your current

I will get back to you on the max current we will use for testing purposes. Noted on replacing the 15A with the max current value.

Hi Dave,

The max current is 5amps.

Dave, so i would need to remove the plug point of the black and white wires and insert it into IA, IB and IC, correct?

Yes the 2 wires from each ct will connect to IA IB and IC

Noted with thanks Dave!

Dave,

Hope youre doing alright. Ive ran tests using the TDK CTs recommended in the technical datasheet, we ran the power source to 80A, however because the CT ratio is 3000:1, at 80A it is barely 0.02 at the IC, so in the Arduino Source Monitor it doesnt even register it at 0.02, it just stays at 0.01. Can you please guide me on improving what I had done? Thanks in advance.

What burden did you use? 

80/3000 = .02 which is current you need to add a burden do develope a voltage 

.707/(80/3000)= 26Ohms burden this assumes ADC full-scale = 80Amps  div .707/2 for some current headroom 

R1 and R2 should be 26/2   the center of the 2 resistors should be tied to gnd

you  also stated 5Amps max why are you running 80Amps?

"

Hi Dave,

Ok thats probably why I didnt get a reading. Because I just calculated the 260hms but didnt apply it to the resistors and gnd. How do I adjust the resistors and gnd to get a good reading?

And the reason we ran it at max of 80Amps was because of the max Amp value stated for the IC to ensure that it could cope with the load.