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ADE7880 Phase of Power Factor

Question asked by Glenn_Wilson on May 24, 2017
Latest reply on Jun 2, 2017 by Glenn_Wilson

How may we reliably detect the Power Factor PHASE in a Delta System?

 

ALL Voltages, Currents, Delta VA, Delta Watts, Delta VAR, and Delta PF all measure Perfectly.

The sign of the PF is continuing to be unreliable – we have tried many methods.

 

                The system has a minimum of 500 Watts of real power.

 

The system is connected per figure 13.4 of AN-639.

 

CONSEL = 0b01

 

A_watts is read from 0xE513

 

C_Watts is read from 0xE515

 

Delta_Watts = A_Watts + C_Watts

 

A_VA is read from 0xE519

 

C_VA is read from 0xE51B

 

Delta_VA = A_VA + C_VA

 

Delta_VAR = sqrt(Delta_Watts^2 - Delta_VA^2)

 

PF = 100(Delta_Watts/Delta_VA)

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We have tried using the sign of FWATTS.

We have tried using SUM1SIGN bit 3 from PHSIGN 0xE617.

We have tried using SUM2SIGN bit 7 from PHSIGN 0xE617.

We have tried using SUM3SIGN bit 8 from PHSIGN 0xE617.

We have tried using the sign of Delta_Watts.

 

We have had marginal success with the first 4 but do NOT obtain reliable results.

 

Please tell me the correct method for determining the phase of PF.

 

Thanks, Glenn Wilson Wilson@stny.rr.com

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