Multi-level transformer and line loss compensator and method

• US 6,757,628 B1
• Filed: 07/14/1999
• Issued: 06/29/2004
• Est. Priority Date: 07/14/1998
• Status: Expired due to Term

• Current Assignee: Landis+Gyr AG (Landis+Gyr Group AG)
• Original Assignee: Landis+Gyr Inc. (Landis+Gyr Group AG)
• Inventors: Berthiaume, Guy H., Bearden, Michael K., Anderson, Larry W.
• Primary Examiner(s): SHAH, KAMINI S
• Application Number:
  US09/353,711
• Time in Patent Office: 1,812 Days
• Field of Search: 702/85, 702/61, 702/62, 702/64, 705/410, 705/412, 705/34, 706/306, 340/870.02
• US Class Current: 702/85
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: G06Q 50/06 Energy or water supply

Abstract

A compensator for use in connection with the metering of electricity calculates multi-level losses due to loss devices such as transformers and transmission lines. The compensator calculates losses to delivered electricity due to the presence of such loss devices and can sum losses from multiple loss devices to determine the electricity being delivered at various points, or levels, in the transmission system.

Claims

1. A compensator for computing compensation level losses in an electrical energy transmission system including devices to which electrical energy losses can be attributed, the compensator coupled to a meter at a first point in the system and in communication with at least one other meter each at a respective point at the system distal from the first point, the compensator comprising:

at least one totalizer programmed to receive at least one input relating to a measure of electricity information, to compute a total value of that electricity information, and to output that value;

a memory device containing at least one loss constant corresponding to a loss device; and

a loss calculator coupled to the at least one totalizer for receiving an output therefrom, and to the memory device for receiving the at least one loss constant therefrom, and programmed for computing an electrical energy loss value based on the outputs received from the at least one totalizer and from the memory device.

2. The compensator according to claim 1, wherein the loss calculator is further programmed to conduct a filtering operation on data received from the at least one totalizer.

3. The compensator according to claim 2, wherein the filtering step comprises a rolling average calculation.

4. The compensator according to claim 1, further comprising a switch coupled to the memory device and adapted for:

receiving loss device information;

selecting an appropriate loss constant from the memory device corresponding to the received loss device information; and

providing the selected loss constant to the loss calculator.

5. The compensator according to claim 1, wherein the at least one totalizer receives a plurality of inputs each carrying information relating to a loss device.

6. The compensator according to claim 1, wherein the at least one totalizer comprises a plurality of totalizers, each totalizer corresponding to at least one compensation level for the system.

7. A compensation method for use in an electrical energy meter coupled to an electrical energy network including loss devices, the energy meter making at least one measurement relating to electrical energy, and the method compensating the at least one measurement for electrical energy loss due to at least one of the loss devices, the method comprising the steps of:

selecting a compensation level of the network;

determining whether a compensation corresponding to the selected level is to be made to the at least one measurement relating to electrical energy;

totalizing the electrical energy measure for at least one of the loss devices; and

calculating, based on the result of the totalization step, a loss for the selected level and attributable to the at least one loss device.

8. The method according to claim 7, wherein the step of totalizing the measure of electricity information by computing a total value of that electricity information, the method comprising the steps of:

determining a set of inputs corresponding to the measure of electricity information;

for each input, determining whether the input is to be summed or subtracted; and

for each input, if the input is to be summed, adding the value of the input to a total value, otherwise subtracting it from the total value.

9. The method according to claim 8, wherein the determination as to which inputs are summed, and which subtracted, is based on the mathematical sign of the input.

10. The method according to claim 7, further including a filtering operation on the result received from the totalization step.

11. The method according to claim 10, wherein the filtering operation includes the steps of:

determining whether the filter depth is less than two; and

computing a rolling average of results received from the totalization step.