I have an ADE7753 circuit design that I would like to adapt to sum voltages on 2 phase legs and sum the currents of those phases sensed by 2 different Current Transformers.
For this, I reference the V2N and V2P to the different phase legs (120V each), and get the expected 208V read by the 7753. I then hook 2 current transformers, each serving one phase leg, in series and connect the resulting P and N to V1P and V1N, but I do not read the expected current. If I just connect 1 of the CT’s to the ADE (either one), the circuit works and I read the expected current. Each CT has its own burden resistor network.
In text, the circuit looks like :
ADE V1N -> CT_B minus -> (CT B) -> CT_B plus -> CT_A minus -> (CT A) -> CT A plus -> ADE V1P
Each CT pin is connected to analog GND via a 4.99 ohm burden resistor.
Am I wrong in expecting this to work? I realize that the implementation is a little strange, but we would like this same basic design to function in 2 different modes.