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KWH energy reading reading more than KVAH

Thread Summary

The user is experiencing a mismatch between KWH and KVAH readings on the ADE9000 metering IC, even after calibration, especially during power cycle tests. The final answer suggests verifying the correctness of IRMS and VRMS calibration, as KVA is dependent on these values. The user waits approximately 1 second between power-on and reading the KVAH and KWH registers.
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Category: Hardware
Product Number: ADE9000

Hi, I’m using the ADE9000 metering IC in my product. I read phase wise energy registers AWATTHR_HI, BWATTHR_HI, CWATTHR_HI, AVARHR_HI, BVARHR_HI, CVARHR_HI, AVAHR_HI, BVAHR_HI, and CVAHR_HI in the same sequence inside the ISR whenever an EGY_READY interrupt occurs.

The EGY_TIME is configured for 999 samples. My ideal input load is 63.5 V, 5 A at UPF. While the measured power values are correct, I am observing a mismatch between KWH and KVAH in the energy (KWH > KVAH).

The behavior is frequent when switching test is done (power cycle is given continuously at an interval of 30sec). Note: The device is calibrated.

Parents
  • Can you show me the RMS values in codes and converted to amps and volts. 

    Same for the powers codes and converted power in watts

    RMS includes any noise, the ADC samples are squared so all information is used. The power calculations are V*I so only signals that are in both V and I are relevant. Could this different be Noise or harmonics that are only on one channel? 

    Dave

  • CONVERSION_CONSTANT_VOLTAGE       5.053972601
    CONVERSION_CONSTANT_CURRENT      0.508144971
    CONVERSION_CONSTANT_POWER          0.344691358
    CONVERSION_CONSTANT_ENERGY         0.098045542

    Supply is given in R phase (60V, 4A, UPF) without any harmonics/ noise. Below values are read inside EGYREADY ISR.


    Vrms code- 11.961741
    Irms code- 8.091316
    Vrms code (fundamental)- 11.952250
    Irms code (fundamental)- 8.086579
    Power code (W)- 719396
    Power code (VA)- 719167
    Power code (fundamental)(W)- 719945
    Power code (fundamental)(VA)- 720533
    Energy code (WH)- 87972
    Energy code (VAH)- 87970
    Energy code (fundamental)(WH)- 87889
    Energy code (fundamental)(VAH)- 87927
    PF- 134165.214

Reply
  • CONVERSION_CONSTANT_VOLTAGE       5.053972601
    CONVERSION_CONSTANT_CURRENT      0.508144971
    CONVERSION_CONSTANT_POWER          0.344691358
    CONVERSION_CONSTANT_ENERGY         0.098045542

    Supply is given in R phase (60V, 4A, UPF) without any harmonics/ noise. Below values are read inside EGYREADY ISR.


    Vrms code- 11.961741
    Irms code- 8.091316
    Vrms code (fundamental)- 11.952250
    Irms code (fundamental)- 8.086579
    Power code (W)- 719396
    Power code (VA)- 719167
    Power code (fundamental)(W)- 719945
    Power code (fundamental)(VA)- 720533
    Energy code (WH)- 87972
    Energy code (VAH)- 87970
    Energy code (fundamental)(WH)- 87889
    Energy code (fundamental)(VAH)- 87927
    PF- 134165.214

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