Service type recognition in electrical utility meter

• US 6,112,158 A
• Filed: 08/01/1996
• Issued: 08/29/2000
• Est. Priority Date: 08/01/1996
• Status: Expired due to Term

• Current Assignee: Landis+Gyr AG (Landis+Gyr Group AG)
• Original Assignee: Siemens Power Transmission & Distribution Incorporated (Siemens AG)
• Inventors: Anderson, Christopher L., Bond, Randal K., Slaven, Robert E.
• Primary Examiner(s): Hafiz, Tariq R.
• Assistant Examiner(s): DAM, TUAN QUANG
• Application Number:
  US08/690,973
• Time in Patent Office: 1,489 Days
• Field of Search: 702/492, 702/551.01, 702/61, 702/62, 702/64, 702/65, 702/82, 702/58, 324/76.52, 324/76.77, 324/107, 324/108, 324/86, 324/74, 324/142, 324/116, 324/140 R, 324/141, 361/76, 361/77, 705/412, 340/661, 340/658, 340/635, 340/637, 340/657-660
• US Class Current: 702/61
• CPC Class Codes: G01R 21/1333 adapted for special tariff measuring
• CPC Class Codes: G06Q 50/06 Energy or water supply

Abstract

Disclosed is a method and arrangement for use in an electrical utility meter, the electrical utility meter operable to be connected to a plurality of electrical service types. The arrangement is operable to identify a present service type, the present service type being one of the plurality of electrical service types to which the electrical utility meter is connected. The arrangement comprises: conversion circuit for obtaining measured voltage magnitude and phase angle data for a plurality of phases in a polyphase electrical system; a memory; and a processor connected to said memory and said conversion circuit. The processor is operable to execute programming steps stored in the memory to receive the measured voltage magnitude and phase angle data from the conversion circuit and identify the present electrical service type based on the measured voltage magnitude and phase angle data.

Claims

1. In an electrical utility meter, the electrical utility meter operable to measure power consumption, a method of identifying a present electrical service type, the method comprising:

a) obtaining measured voltage magnitude and phase angle data for a plurality of phases in a polyphase electrical system; and

b) automatically identifying the present electrical service type based on the measured voltage magnitude and phase angle data.

2. The method of claim 1 wherein further comprising the step of displaying information identifying the present electrical service type on a meter display.

3. The method of claim 2 further comprising the step of using the meter display to request an operator for verification of the present electrical service type.

4. The method of claim 1 further comprising the step of using the present electrical service type in subsequent electric utility meter diagnostic operations.

5. The method of claim 4 wherein the step of using the present electrical service type in subsequent electrical utility meter diagnostic operations further comprises:

obtaining subsequent measured voltage magnitude and phase angle data for one or more phases of a polyphase electrical system;

using the subsequent measured voltage magnitude and phase angle data and a set of expected voltage magnitude and phase angle values corresponding to the present electrical service type to determine whether an error is present.

6. The method of claim 1 further comprising the step of performing an adjustment on the electrical utility meter, the adjustment corresponding to the present electrical service type, the adjustment increasing a metering accuracy of the electric utility meter.

7. In an electrical utility meter, the electrical utility meter operable to measure power consumption, a method of identifying a present electrical service type, the method comprising:

a) obtaining measured voltage magnitude and phase angle data for a plurality of phases in a polyphase electrical system; and

b) comparing the measured voltage magnitude and phase angle data to expected values for a plurality of electrical service types; and

c) identifying the present electrical service type based on the comparison of the measured voltage magnitude and phase angle data and the expected values.

8. The method of claim 7 wherein further comprising the step of d) displaying information identifying the present electrical service type on a meter display.

9. The method of claim 8 further comprising the step of using the meter display to request an operator for verification of the present electrical service type.

10. The method of claim 7 further comprising the step of using the present electrical service type in subsequent electrical utility meter diagnostic operations.

11. The method of claim 10 wherein the step of using the present electrical service type in subsequent electrical utility meter diagnostic operations further comprises:

obtaining subsequent measured voltage magnitude and phase angle data for one or more phases of a polyphase electrical system;

using the subsequent measured voltage magnitude and phase angle data and a set of expected voltage magnitude and phase angle values corresponding to the present electrical service type to determine whether an error is present.

12. The method of claim 7 further comprising the step of performing an adjustment on the electrical utility meter, the adjustment corresponding to the present electrical service type, the adjustment increasing a metering accuracy of the electric utility meter measurement signals representative of electrical power consumed by a facility.

13. The method of claim 7 further comprising the step of repeating steps a, b and c after a time interval.

14. An arrangement for use in an electrical utility meter, the electrical utility meter operable to be connected to a plurality of electrical service types, the arrangement operable to identify a present service type, the present service type being one of the plurality of electrical service types to which the electrical utility meter is connected, the arrangement comprising:

a) conversion circuit for obtaining measured voltage magnitude and phase angle data for a plurality of phases in a polyphase electrical system; and

b) a memory;

c) a processor connected to said memory and said conversion circuit, the processor operable to execute programming steps stored in the memory to;

receive the measured voltage magnitude and phase angle data from the conversion circuit and

identify the present service type based on the measured voltage magnitude and phase angle data.

15. The arrangement of claim 14 further comprising a meter display connected to the processor and wherein the processor is further operable to execute the programming steps stored in the memory to cause the meter display to display information identifying the present service type.

16. The arrangement of claim 15 wherein the processor is further operable to execute the programming steps stored in the memory to cause the meter display to request an operator for verification of the present service type.

17. The arrangement of claim 14 wherein the processor is further operable to execute the programming steps stored in the memory to use the present service type in subsequent electrical utility meter diagnostic operations.

18. The arrangement of claim 17 wherein the processor is further operable to execute the programming steps stored in the memory to use the present service type in subsequent electrical utility meter diagnostic operations further by:

obtaining subsequent measured voltage magnitude and phase angle data for one or more phases of a polyphase electrical system; and

using the subsequent measured voltage magnitude and phase angle data and a set of expected voltage magnitude and phase angle values corresponding to the present service type to determine whether an error is present.

19. The arrangement of claim 14 wherein the processor is further operable to execute the programming steps stored in the memory to perform an adjustment on the electrical utility meter, the adjustment corresponding to the present service type, the adjustment increasing a metering accuracy of the electrical utility meter.

20. An electrical utility meter for use in metering energy consumption, the electrical utility meter operable to be connected to a plurality of electrical service types, the electrical utility meter comprising:

a) polyphase sensor means for generating polyphase voltage and current measurement signals;

b) a conversion circuit, connected to the polyphase sensor means, for receiving the polyphase voltage and current measurement signals and generating measured voltage magnitude and phase angle data therefrom, and for generating power consumption data; and

c) a memory, said memory containing expected values, said expected values comprising at least expected voltage magnitude and phase angle values for a plurality of electrical service types;

d) a processor connected to said memory and said conversion circuit, the processor operable to;

receive power consumption data from the conversion circuit and generate power consumption information therefrom,

receive the measured voltage magnitude and phase angle data from the conversion circuit,

compare the measured voltage magnitude and phase angle data to the expected values stored in the memory,

identify a present service type based on the comparison of the measured voltage magnitude and phase angle data and the expected values; and

e) a meter display connected to the processor, said display operable to display information pertaining to the power consumption information.

21. The electrical utility meter of claim 20 wherein the meter display is further operable to display information identifying the present service type.

22. The electrical utility meter of claim 20 wherein the polyphase voltage and current measurement signals include polyphase voltage signals and polyphase current signals, and wherein the conversion circuit includes:

an analog to digital converter operably connected to the polyphase sensor means to receive at least the polyphase voltage measurement signals and further operable to generate digital voltage measurement signals from the polyphase voltage measurement signals;

a digital signal processor connected to the analog to digital converter to receive the digital voltage measurement signals and operable to generate measured voltage magnitude and phase angle data therefrom.

23. The electrical utility meter of claim 22 wherein the analog to digital converter and the digital signal processor are integrated onto a single semiconductor substrate.

24. The electrical utility meter of claim 20 further comprising f) a nonvolatile memory connected to the processor, and wherein the processor is further operable to provide the power consumption information to the nonvolatile memory.

25. The electrical utility meter of claim 20 wherein said memory and said processor are integrated onto a single semiconductor substrate.

26. The electrical utility meter of claim 20 further comprising a communication port operable connected to the processor, and wherein processor is operable to provide the power consumption information to the communication port for communication to a centralized processing facility.