DETERMINATION OF DISTRIBUTION TRANSFORMER VOLTAGES BASED ON METERED LOADS

• US 20100179780A1
• Filed: 01/14/2009
• Published: 07/15/2010
• Est. Priority Date: 01/14/2009
• Status: Active Grant

• Current Assignee: Accenture Global Services Limited (Accenture PLC)
• Original Assignee: Accenture Global Services GmbH (Accenture PLC)
• Inventors: Taft, Jeffrey D.
• Granted Patent: US 8,103,467 B2
• Time in Patent Office: Days
• US Class Current: 702/64
• CPC Class Codes: G01R 19/2513 Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging

Abstract

A method for determining a primary side voltage of a distribution transformer includes determining a first current and a second current flowing through a secondary winding of the transformer at a plurality of time instants based on current meter data generated by a plurality of metered loads. The method may include determining a total current flowing to the plurality of metered loads for each of the plurality of time instants based on the first current and the second current. The method includes receiving a respective meter voltage from each of the plurality of metered loads at each of the plurality of time instants. The method includes determining a secondary side voltage of the transformer at each of the plurality of time instants based on the first, second, and total current and the respective meter voltages. The method includes determining the primary side voltage based on the secondary side voltage.

Claims

1. A method for determining a primary side voltage of a distribution transformer comprising:

determining a first current flowing through a secondary winding of the distribution transformer at a plurality of time instants based on current meter data generated by a plurality of metered loads connected to a secondary side of the distribution transformer;

determining a second current flowing through the secondary winding of the distribution transformer at the plurality of time instants based on the current meter data generated by the plurality of metered loads connected to the secondary side of the distribution transformer;

determining a total current flowing to the plurality of metered loads for each of the plurality of time instants based on the first current at the plurality of time instants and the second current at the plurality of time instants;

receiving a respective meter voltage from each of the plurality of metered loads at each of the plurality of time instants;

determining a secondary side voltage of the distribution transformer at each of the plurality of time instants based on the first current, the second current, the total current, and the respective meter voltages at the plurality of time instants; and

determining the primary side voltage based on the secondary side voltage determined at one of the plurality of time instants.

2. The method of claim 1, where the plurality of time instants is a first time instant, a second time instant, and a third time instant.

3. The method of claim 1, where determining the first current flowing through the secondary winding of the distribution transformer at the plurality of time instants comprises:

measuring the current flowing through a first corresponding branch of each of the plurality of metered loads at the plurality of time instants; and

summing the measured currents flowing through each of the first corresponding branches of the plurality of metered loads at each of the plurality of time instants.

4. The method of claim 3, where determining the second current flowing through the secondary winding of the distribution transformer at the plurality of time instants comprises:

measuring the current flowing through a second corresponding branch of each of the plurality of metered loads at the plurality of time instants; and

summing the measured currents flowing through each of the second corresponding branches of the plurality of metered loads at each of the plurality of time instants.

5. The method of claim 1, where receiving the respective meter voltage from each of the plurality of metered loads at each of the plurality of time instants comprises receiving the respective meter voltage from a first meter and a second meter at each of the plurality of time instants.

6. The method of claim 5 further comprising determining respective service line drop losses associated with the first meter and the second meter;

wherein, determining the secondary side voltage of the distribution transformer at each of the plurality of time instants further includes determining the secondary side voltage of the distribution transformer at each of the plurality of time instants based on the respective service line drop losses.

7. The method of claim 1, further comprising determining a first common line loss and a second common line loss associated with secondary winding of the distribution transformer;

wherein, determining the secondary side voltage of the distribution transformer at each of the plurality of time instants further includes determining the secondary side voltage of the distribution transformer at each of the plurality of time instants based on the first common line loss and the second common line loss.

8. A system to determine a primary side voltage of a distribution transformer comprising:

a processor configured to;

determine a first current flowing through a secondary winding of a distribution transformer at a plurality of time instants based on current meter data generated by a plurality of metered loads connected to a secondary side of the distribution transformer;

determine a second current flowing through the secondary winding of the distribution transformer at the plurality of time instants based on the current meter data generated by the plurality of metered loads connected to the secondary side of the distribution transformer;

determine a total current flowing to the plurality of metered loads for each of the plurality of time instants based on the first current at the plurality of time instants and the second current at the plurality of time instants;

receive a respective meter voltage from each of the plurality of metered loads at each of the plurality of time instants;

determine a secondary side voltage of the distribution transformer at each of the plurality of time instants based on the first current, the second current, the total current, and the respective meter voltages at the plurality of time instants; and

determine the primary side voltage based on the secondary side voltage determined at one of the plurality of time instants.

9. The system of claim 8, where the plurality of time instants is a first time instant, a second time instant, and a third time instant.

10. The system of claim 8, where the processor is further configured to:

measure the current flowing through a first corresponding branch of each of the plurality of metered loads at the plurality of time instants; and

sum the measured currents flowing through each of the first corresponding branches of the plurality of metered loads at each of the plurality of time instants to determine the first current flowing through the secondary winding of the distribution transformer at the plurality of time instants.

11. The system of claim 10, where the processor is further configured to:

measure the current flowing through a second corresponding branch of each of the plurality of metered loads at the plurality of time instants; and

sum the measured currents flowing through each of the second corresponding branches of the plurality of metered loads at each of the plurality of time instants to determine the second current flowing through the secondary winding of the distribution transformer at the plurality of time instants.

12. The system of claim 8, where the respective meter voltage from each of the plurality of metered loads at each of the plurality of time instants is a first meter voltage from a first meter and a second meter voltage from a second meter.

13. The system of claim 12, wherein the processor is further configured to:

receive respective service line drop losses associated with the first meter and the second meter; and

determine the secondary side voltage of the distribution transformer at each of the plurality of time instants based on the respective service line drop losses.

14. The system of claim 8, wherein the processor is further configured to:

receive a first common line loss and a second common line loss associated with secondary winding of the distribution transformer; and

determine the secondary side voltage of the distribution transformer at each of the plurality of time instants further based on the first common line loss and the second common line loss.

15. A computer-readable medium encoded with computer executable instructions, the computer executable instructions executable with a processor, the computer-readable medium comprising:

instructions executable to determine a first current flowing through a secondary winding of a distribution transformer at a plurality of time instants based on current meter data generated by a plurality of metered loads connected to a secondary side of the distribution transformer;

instructions executable to determine a second current flowing through the secondary winding of a distribution transformer at the plurality of time instants based on the current meter data generated by the plurality of metered loads connected to the secondary side of the distribution transformer;

instructions executable to determine a total current flowing to the plurality of metered loads for each of the plurality of time instants based on the first current at the plurality of time instants and the second current at the plurality of time instants;

instructions executable to receive a respective meter voltage from each of the plurality of metered loads at each of the plurality of time instants;

instructions executable to determine a secondary side voltage of the distribution transformer at each of the plurality of time instants based on the first current, the second current, the total current, and the respective meter voltages at the plurality of time instants; and

instructions executable to determine a primary side voltage of the distribution transformer based on the secondary side voltage determined at one of the plurality of time instants.

16. The computer-readable medium of claim 15, where the plurality of time instants is a first time instant, a second time instant, and a third time instant.

17. The computer-readable medium of claim 15 further comprising:

instructions executable to measure the current flowing through a first corresponding branch of each of the plurality of metered loads at the plurality of time instants; and

instructions executable to sum the measured currents flowing through each of the first corresponding branches of the plurality of metered loads at each of the plurality of time instants to determine the first current flowing through the secondary winding at the plurality of time instants.

18. The computer-readable medium of claim 17 further comprising:

instructions executable to measure the current flowing through a second corresponding branch of each of the plurality of metered loads at the plurality of time instants; and

instructions executable to sum the measured currents flowing through each of the second corresponding branches of the plurality of metered loads at each of the plurality of time instants to determine the second current flowing through the secondary winding at the plurality of time instants.

19. The computer-readable medium of claim 15 further comprising:

instructions executable to receive a respective meter voltage from a first meter and a second meter at each of the plurality of time instants.

20. The computer-readable medium of claim 19 further comprising:

instructions executable to determine respective service line drop losses associated with the first meter and the second meter; and

instructions executable to determine the secondary side voltage of the distribution transformer at each of the plurality of time instants based on the respective service line drop losses.

21. The computer-readable medium of claim 15 further comprising:

instructions executable to determine a first common line loss and a second common line loss associated with secondary winding of the distribution transformer; and

instructions executable to determine the secondary side voltage of the distribution transformer at each of the plurality of time instants based on the first common line loss and the second common line loss.