We are using ADE9000 on our product, we finalized our prototype and now we are doing some specific tests.
We have a new design using the ADE9000 that is based on the eval board. We can read voltage and current but we have a strange situation with reading current channels.
We are connecting a three-phase signal generator to voltage and current for testing and calibration.
Voltages are connected in 4-Wire Wye configuration with A, B, and C connect to voltage sources and neutral connected to ground. Voltages work fine.
If we have connected only one current channel the value read from ADE9000 matched with the value of the generator. E.g Only IA.
If we have connections in more than one current channel the values read from ADE9000 does not match with the generator. E.g IA and IB.
We can’t understand what is happening. We noticed the same behaviour on the eval board.
VCONSEL = 000
ICONSEL = 0
Has anyone ever had something similar that might help to clarify?
Hi Can you please explain more what input are you putting to IA and IB? How do you connect those? and also, what are the results on the experiment with IA and IB?
We are testing our new prototype PCB at the moment which has 2 x ADE9000 devices incorporated and we want to iron this issue out before moving to the commercial design and volume build.
In a single phase arrangement, current and voltage are read as expected on Phase A.
When we setup a 3 phase, 4 wire arrangement, all three voltages read as expected. When the first current is applied to phase A, it reads as expected.
However, when subsequent current signals are applied, a lower than expected current is read across all three phases including phase A which read as expected initially.
In the test setup, we are using a Kocos EPOS 340 voltage and current signal generator (https://www.kocos.com/electrical-metrology/power-sources/introduction/epos-340/epos-340/) to generate 3 x 230L-N voltages 120degrees out of phase and 3 currents of 1A (simulating a CT) 120 degrees out of phase.
See below for an example of what occurs during the test:
VA = 230V 0 degree 50Hz
VB = 230V 240 degree 50Hz
VC = 230V 120 degree 50Hz
IA = 1A 0 degree 50Hz
IB = 1A 240 degree 50Hz
IC = 1A 120 degree 50Hz
CT turns ratio 1:1
Total CT Burden Resistor 0.07Ohm
VA, VB, VC and IA connected; AS EXPECTED
VA, VB, VC, IA and IB connected; VOLTAGES READING AS EXPECTED BUT IA AND IB CURRENT LESS THAN EXPECTED
VA, VB, VC, IA, IB and IC connected; VOLTAGES READING AS EXPECTED BUT IA, IB AND IC CURRENT LESS THAN EXPECTED
When the test setup is used with an independent off the shelf standard digital energy meter, we get behaviour as we would expect (i.e. 3 voltages of 230V and 3 currents of 1A across each phase).
Is there anything we could be doing wrong with configuration when it comes to a 3Phase 4 Wire configuration?
Hi Aheredia, ADE team!
Thanks for your help.
An additional update. We visited a site today to test the prototype board with a real set of CTs and 3phase 4 wire supply. All worked as required which is great.
The issue must be with our signal generator equipment which we will investigate further.
Thanks for your time in supporting our queries related to the ADE9000.