Gating energy consumption accumulation by detecting a fundamental component of a current

1. A method of measuring energy in an electric metering system, the method comprising:

receiving, at the electric metering system and from an electrical grid, an A/C signal;

obtaining a current measurement signal of a current of the A/C signal, wherein the current measurement signal includes a fundamental frequency component and a noise component;

filtering the noise component from the current measurement signal, thereby creating a filtered current measurement signal; and

when the filtered current measurement signal is greater than a starting current threshold:

obtaining a voltage measurement signal of a voltage of the A/C signal; and

calculating an energy consumption measurement from the voltage measurement signal and the current measurement signal.

2. The method of claim 1 , further comprising:

applying the A/C signal to a load that is connected to the electric metering system.

3. The method of claim 1 , further comprising:

when the filtered current measurement signal is less than the starting current threshold, outputting a zero energy consumption value.

4. The method of claim 1 , wherein calculating the energy consumption measurement comprises:

accumulating, over a period of time, a plurality of power consumption measurements; and determining an energy consumption by integrating the plurality of power consumption measurements.

5. The method of claim 1 , wherein the noise component comprises one or more harmonic components of the fundamental frequency component.

6. The method of claim 1 , wherein the noise component is generated from an electric circuit.

7. The method of claim 1 , wherein the voltage measurement signal comprises a voltage noise component, the method further comprising filtering the voltage measurement signal to remove any harmonic voltage components, thereby creating a filtered voltage component, and wherein the energy consumption measurement is calculated based on the filtered voltage component.

8. A method of measuring energy in an electric metering system, the method comprising:

receiving, at the electric metering system and from an electrical grid, an A/C signal;

applying the A/C signal to a load that is connected to the electric metering system;

obtaining a current measurement signal of a current of the A/C signal, wherein the current measurement signal includes a fundamental frequency component and a noise component;

filtering the noise component from the current measurement signal, thereby creating a filtered current measurement signal;

obtaining a voltage measurement of the A/C signal;

calculating an energy consumption measurement from the voltage measurement and the current measurement signal; and

when the energy consumption measurement is greater than an energy consumption threshold, accumulating the energy consumption measurement.

9. The method of claim 8 , wherein calculating the energy consumption measurement comprises:

filtering the voltage measurement of the A/C signal to remove a noise voltage component, thereby creating a filtered voltage component; and

calculating, from the filtered voltage component and the filtered current measurement signal, a fundamental-only energy consumption measurement.

10. The method of claim 8 , wherein calculating the energy consumption measurement comprises:

filtering the voltage measurement of the A/C signal to remove a noise voltage component, thereby creating a filtered voltage measurement signal; and

calculating, from the filtered voltage measurement signal and the filtered current measurement signal, a volt-ampere (VA) reactive energy consumption measurement.

11. The method of claim 8 , wherein calculating the energy consumption measurement comprises:

calculating a volt-ampere (VA) root-mean-squared (RMS) power consumption of the filtered current measurement signal.

12. An electric metering system comprising:

a current measurement device configured to obtain a current measurement signal of a current of an A/C signal, wherein the current measurement signal includes a fundamental frequency component and a noise component;

a voltage measurement device configured to a voltage measurement signal of a voltage of the A/C signal; and

a processor configured to perform operations comprising:

receiving, from the current measurement device, the current measurement signal;

filtering the noise component from the current measurement signal, thereby creating a filtered current measurement signal; and

when the filtered current measurement signal is greater than a starting current threshold:

obtaining the voltage measurement signal from the voltage measurement device; and

calculating an energy consumption measurement from the voltage measurement signal and the filtered current measurement signal.

13. The electric metering system of claim 12 , wherein the electric metering system is configured to apply the A/C signal to a load that is connected to the electric metering system.

14. The electric metering system of claim 12 , wherein the operations further comprise:

when the filtered current measurement signal is less than the starting current threshold, outputting a zero energy consumption value.

15. The electric metering system of claim 12 , wherein calculating the energy consumption measurement comprises:

accumulating, over a period of time, a plurality of power consumption measurements; and determining an energy consumption by integrating the plurality of power consumption measurements.

16. The electric metering system of claim 12 , wherein calculating the energy consumption measurement comprises:

calculating a volt-ampere (VA) root-mean-squared (RMS) power consumption of the filtered current measurement signal.

17. The electric metering system of claim 12 , wherein the noise component comprises one or more harmonic components of the fundamental frequency component.

18. The electric metering system of claim 12 , wherein the noise component is generated from an electric circuit.

19. The electric metering system of claim 12 , wherein the voltage measurement signal comprises a voltage noise component, wherein the operations further comprise filtering the voltage measurement signal to remove the noise voltage component thereby creating a filtered voltage component, and wherein the operations further comprise calculating the energy consumption measurement based on the filtered voltage component.

20. An electric meter testing environment comprising:

an electric meter comprising:

an input configured to receive an A/C signal;

a current measurement device configured to obtain a current measurement signal of a current of the A/C signal, wherein the current measurement signal includes a fundamental frequency component and a noise component;

a filter configured to filter the noise component from the current measurement signal, thereby creating a filtered current measurement signal;

a processor configured to determine, from the filtered current measurement signal and a voltage of the A/C signal, an energy consumption measurement; and

an output configured to provide the A/C signal to a load; and

a meter testing device configured to:

cause the output of the electric meter to be open- circuited;

apply the A/C signal to the input of the electric meter;

receive, from the electric meter, the energy consumption measurement; and

responsive to determining that the energy consumption measurement is within a tolerance of an expected energy consumption measurement, identify the electric meter as validated.