ELECTRICAL ENERGY LOSS DETECTION

• US 20200132739A1
• Filed: 01/10/2019
• Published: 04/30/2020
• Est. Priority Date: 10/25/2018
• Status: Active Grant

• Current Assignee: Microchip Technology Incorporated
• Original Assignee: Microchip Technology Incorporated
• Inventors: Staver, Daniel A.
• Granted Patent: US 10,914,770 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 11/57 Multi-rate meters G01R11/63 takes precedence
• CPC Class Codes: G01R 22/066 Arrangements for avoiding or indicating fraudulent use
• CPC Class Codes: G01R 29/16 Measuring asymmetry of polyphase networks

Abstract

Various embodiments relate to detecting theft of electrical energy. A method of detecting theft of electrical energy may include measuring, for each time sample of a number of time samples, a neutral current of an electrical energy metering system. The method may further include summing, for each time sample of the number of time samples, a number of measured phase current values of the electrical energy metering system to determine an imputed neutral current. Further, the method may include determining, for each time sample of the number of time samples, a squared difference between the measured neutral current and the imputed neutral current. Moreover, the method may include integrating, for each time sample of the number of time samples, the squared difference to determine an accumulator value. In addition, the method may include detecting, based on the accumulator value, theft of electrical energy from the electrical energy metering system.

Claims

1. A method of detecting theft of electrical energy, the method comprising;

measuring, for each time sample of a number of time samples, a neutral current of an electrical energy metering system;

summing, for each time sample of the number of time samples, a number of measured phase current values of the electrical energy metering system to determine an imputed neutral current;

determining, for each time sample of the number of time samples, a squared difference between the measured neutral current and the imputed neutral current;

integrating, for each time sample of the number of time samples, the squared difference to determine an accumulator value; and

detecting, based on the accumulator value, theft of electrical energy from the electrical energy metering system.

2. The method of claim 1, wherein the integrating comprises integrating, for each time sample of the number of time samples, the squared difference over an integral number of half cycles to determine the accumulator value.

3. The method of claim 1, further comprising:

squaring, for each time sample of the number of time samples, the measured neutral current; and

integrating, for each time sample of the number of time samples, the squared measured neutral current to determine an integrated measured neutral current squared.

4. The method of claim 3, further comprising:

squaring, for each time sample of the number of time samples, the imputed neutral current; and

integrating, for each time sample of the number of time samples, the squared imputed neutral current to determine an integrated imputed neutral current squared.

5. The method of claim 4, further comprising:

determining a phase angle between the integrated measured neutral current squared and the integrated imputed neutral current squared via the Law of Cosines; and

outputting a signal indicative of the determined phase angle.

6. The method of claim 1, wherein the measuring the neutral current of the electrical energy metering system comprises one of processing raw data and processing filtered data to measure the neutral current.

7. The method of claim 1, wherein the summing the number of phase currents to determine the imputed neutral current comprises one of summing raw data and summing filtered data.

8. A system, comprising:

one or more processors configured to;

measure, for each time sample of a number of time samples, a neutral current of an electrical energy metering system;

sum, for each time sample of the number of time samples, a number of measured phase current values of the electrical energy metering system to determine an imputed neutral current;

determine, for each time sample of the number of time samples, a squared difference between the measured neutral current and the imputed neutral current;

integrate, for each time sample of the number of time samples, the squared difference to determine an accumulator value; and

detect, based on the accumulator value, theft of electrical energy from the electrical energy metering system.

9. The system of claim 8, wherein the one or more processors are configured to integrate, for each time sample of the number of time samples, the squared difference over an integral number of half cycles to determine the accumulator value.

10. The system of claim 8, wherein the one or more processors are further configured to:

square, for each time sample of the number of time samples, the measured neutral current; and

integrate, for each time sample of the number of time samples, the squared measured neutral current to determine an integrated measured neutral current squared.

11. The system of claim 10, wherein the one or more processors are further configured to:

square, for each time sample of the number of time samples, the imputed neutral current; and

integrate, for each time sample of the number of time samples, the squared imputed neutral current to determine an integrated imputed neutral current squared.

12. The system of claim 11, wherein the one or more processors are further configured to determine a phase angle between the integrated measured neutral current squared and the integrated imputed neutral current squared via the Law of Cosines.

13. The system of claim 8, wherein the one or more processors are configured to process one of raw data and filtered data to measure the neutral current.

14. The system of claim 8, wherein the one or more processors are configured to one of sum rata phase current data and sum filtered phase current data to determine the imputed neutral current.

15. The system of claim 8, further comprising a monitoring unit including and meter and at least one processor of the one or more processors.

16. A non-transitory computer-readable medium having computer instructions stored thereon that are executable by a processing device to perform or control performance of operations comprising:

measuring, for each time sample of a number of time samples, a neutral current of an electrical energy metering system;

summing, for each time sample of the number of time samples, a number of measured phase current values of the electrical energy metering system to determine an imputed neutral current;

determining, for each time sample of the number of time samples, a squared difference between the measured neutral current and the imputed neutral current;

integrating, for each time sample of the number of time samples, the squared difference to determine an accumulator value; and

detecting, based on the accumulator value, theft of electrical energy from the electrical energy metering system.

17. The non-transitory computer-readable medium of claim 16, wherein the integrating comprises integrating, for each time sample of the number of time samples, the squared difference over an integral number of half cycles to determine the accumulator value.

18. The non-transitory computer-readable medium of claim 16, the operations further comprising:

squaring, for each time sample of the number of time samples, the measured neutral current; and

integrating, for each time sample of the number of time samples, the squared measured neutral current to determine an integrated measured neutral current squared.

19. The non-transitory computer-readable medium of claim 18, the operations further comprising:

squaring, for each time sample of the number of time samples, the imputed neutral current; and

integrating, for each time sample of the number of time samples, the squared imputed neutral current to determine an integrated imputed neutral current squared.

20. The non-transitory computer-readable medium of claim 19, the operations further comprising determining a phase angle between the integrated measured neutral current squared and the integrated imputed neutral current squared via the Law of Cosines.

21. The non-transitory computer-readable medium of claim 16, wherein the measuring the neutral current of the electrical energy metering system comprises one of processing raw data and processing filtered data to measure the neutral current.

22. The non-transitory computer-readable medium of claim 16, wherein the summing the number of phase currents to determine the imputed neutral current comprises one of summing rata data and summing filtered data.