How do I configure ADE7880 to correctly calculate energy in 4-wire DELTA, where the Neutral is the actual Neutral, not between phase A and B?
Let me see if I understand this correctly:
The connections available to you are the 3 phases (A, B and C) and the Neutral, in total 4 wires. Does this mean that the load is connected in a delta configuration with 3 loads, one between A and B, one between B and C, and one between C and A. Then the source is an actual 4-wire wye source supplying a 3-wire delta load? What is the neutral used for in this case?
With the 3-phase wye configuration that is available, given the 3-phase and a neutral, the system can be treated like a wye system (phase current and phase to neutral voltage measured) and the energy can be calculated per phase and added up for the total for all 3 phases. Or it can be treated like a 3-wire delta measuring phase current and phase B taken as the reference to measure Phase A/C to B voltage.
My configuration is exactly as you have describe it in your first paragraph.
This configuration does not fit any of the four configurations described in the datasheet, as far as I can see. Then my question is:
Can ADE7880 calculate actual energy for this configuration? Is there a way that the internal calculations can be manipulated by the firmware?
Thank you for your help,
In that case, there are a variety of different options and it is convenient that you have the Neutral as a connection, as you will see below. Page 14 - 15 of the Application Note, AN-639, may be helpful in visualizing the configurations. Below are two configurations that can be used:
Please let me know if these configurations need clarification.
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