Correcting accumulated power in utility meters

Patent metadata

Field	Value
Publication number	US-9625559-B2
Application number	US-201213647238-A
Country	US
Kind code	B2
Filing date	Oct 8, 2012
Priority date	Oct 8, 2012
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A system includes a utility meter. The utility meter includes a first sensor configured to detect a usage, a generation, or a combination thereof of electric power, and a power detection and correction system configured to detect and correct an inaccuracy with a measurement of an electrical voltage, electrical current, or a combination thereof from the first sensor. The power detection and correction system includes a processor configured to execute a program stored in a memory of the utility meter.

First claim

The invention claimed is:

1. A meter, comprising:
a voltage sensor configured to measure a voltage over a time period; and
a current sensor configured to measure current over the time period;
a processor;
a memory including instructions that, when executed by the processor, cause the processor to perform operations comprising:
calculating, based on a product of the voltage over the time period and the current over the time period, a power over the time period;
summing an absolute value of the power over the time period;
determining whether the power over the time period is:
delivered to a load connected to the meter; or
received from a source connected to the meter;

correcting an accumulated power registered by the meter by performing one of:
adding the sum of the absolute value of the power over the time period to the accumulated power if the power over the time period is delivered to the load connected to the meter, and
subtracting the sum of the absolute value of the power over the time period from the accumulated power if the power over the time period is received from the source connected to the meter.

2. The meter of claim 1 , wherein the voltage sensor and the current sensor are configured to measure a voltage and a current in a bus bar.

3. The meter of claim 2 , wherein the current sensor comprises a current transformer.

4. The meter of claim 1 , wherein there is a shift between a zero-crossing point in the voltage over the time period and a zero-crossing point in the current over the time period.

5. The meter of claim 1 , wherein the meter is one of a single phase device and poly phase device.

6. The meter of claim 1 , wherein the meter is an advanced meter infrastructure (AMI) smart meter.

7. The meter of claim 1 , wherein the current over the time period includes an exponentially decaying direct current component.

8. The meter of claim 1 , wherein determining whether the power is received or delivered is determined independent of a sign of the power over the time period.

9. A non-transitory computer readable medium including instructions stored therein that, when executed by a processor, cause the processor to perform operations comprising:
calculating by the processor, a power over a time period based on a product of:
a voltage measured over the time period, wherein the voltage is measured by a sensor at a bus of a meter; and
a current measured over the time period, wherein the voltage is measured by a sensor at the bus of the meter;
summing by the processor, an absolute value of the power over the time period;
determining by the processor, whether the power over the time period is:
delivered to a customer load connected to the meter;
or received from a customer source connected to the meter; and

correcting by the processor, an accumulated power registered by the meter by performing one of:
adding the sum of the absolute value of the power over the time period to the accumulated power if the power is delivered to the customer load connected to the meter, and
subtracting the sum of the absolute value of the power over the time period from the accumulated power if the power is received from the customer source connected to the meter.

10. The non-transitory computer readable medium of claim 9 , wherein there is a shift between a zero-crossing point in the voltage over the time period and a zero-crossing point in the current over the time period.

11. The non-transitory computer readable medium of claim 9 , wherein the current over the time period includes an exponentially decaying direct current component.

12. The non-transitory computer readable medium of claim 9 , wherein determining whether the power is received or delivered is determined independent of a sign of the power over the time period.

Assignees

• Gen Electric

Inventors

• Fahrenbruch John Kirk

Classifications

• G01R35/04 Primary

  of instruments for measuring time integral of power or current · CPC title