Regarding the setting of the branch circuits(Wye of Delta) of HDPM6000

[T.Okada]

Hello,

I have a question about the branch circuit settings for the HDPM6000.
In the Channel Config tab, when combining three circuits, you can choose whether the branch circuit is Wye or Delta. How does this setting affect measurements and other values?
In my environment, I applied voltage and current using a tester with both options, and they appeared to show the same values. I couldn’t see any difference, so I’m asking for clarification.

Regards,

Okada

[Mehran_Mehrnia · Accepted solution]

Hi @T.Okada 

Yes, as long as the physical installation is wired properly for the system type and the matching option (Wye or Delta) is selected in the Channel Cfg tab, the meter will calculate true aggregate 3-phase power (kW, kVAR, kVA, and Power Factor) accurately.

Individual Channel Measurements:
Single-channel parameters (such as raw branch current or phase voltage) do not change because the physical CTs measure current directly regardless of topology. This is why basic individual tester inputs look identical in both modes.

3-Phase Aggregate Power Calculations:

The Wye vs. Delta toggle changes the internal math used to calculate total 3-phase power across the combined channels:

• Wye Configuration: Calculations reference Line-to-Neutral (VL-N) voltages across all 3 phases (3-element measurement).

• Delta Configuration: Because a standard 3-wire Delta system has no neutral wire, the meter uses Blondel’s Two-Wattmeter Method using Line-to-Line (VL-L) voltages.

Best Regards,

-Mehran

L3 Expert Advanced metering

[T.Okada]

Hi @Mehran_Mehrnia,

Thank you for your reply.

As a criterion for choosing Delta or Wye when combining three branch circuits, should we decide based on whether the main feeder is three-phase four-wire or three-phase three-wire?

Regards,

Okada

[AnandK]

Hi  

T.Okada

Not necessarily. Choose Wye or Delta based on the electrical system connected to the HDPM6000, not just the main feeder.

[Mehran_Mehrnia]

Hi @T.Okada 

The selection criterion for combining channels as Wye or Delta in the Channel Config tab should strictly match the physical wiring topology of the circuit being measured and connected to the HDPM6000:

Wye (3-Phase 4-Wire): Select this if the physical circuit includes a Neutral conductor connected to the meter's reference terminal.

Delta (3-Phase 3-Wire): Select this if it is a 3-wire line with no Neutral reference connected to the meter.

Additional Consideration:
If the main feeder carries a Neutral because it serves single-phase or unbalanced loads, you must connect the Neutral wire to the HDPM6000 and select Wye to ensure accurate 3-phase power and energy calculations. Omitting the Neutral wire and configuring as Delta is only valid if the downstream load is strictly a 3-wire, 3-phase balanced load (such as a 3-phase motor).

Best Regards,

-Mehran

L3 Expert Advanced metering

[Charles_Murison · Accepted solution]

Hello @T.Okada ,

For example you could have a head unit connected to a wye system, 80% of the circuits in the panel are connected wye, 20% of the circuits in the panel are connected Delta. You would wire the head unit as wye and configure circuits based on what the wiring in the panel is.

However if head unit is delta, then will not be able to monitor any circuits in the panel as wye.

Regards,

Charles

[T.Okada]

Hello @AnandK , @Charles_Murison , @Mehran_Mehrnia 

Thank you for your reply.

I understand that the choice between Wye and Delta affects how power is calculated.

Regards,

Okada