SYSTEM FOR MONITORING ELECTRICAL POWER USAGE OF A STRUCTURE AND METHOD OF SAME

• US 20180252751A1
• Filed: 04/30/2018
• Published: 09/06/2018
• Est. Priority Date: 07/02/2010
• Status: Active Grant

• Current Assignee: Belkin International Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Belkin International Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yogeeswaran, Karthik, Kelly, Francis, Patel, Shwetak N., Gupta, Sidhant, Reynolds, Matthew S.
• Granted Patent: US 10,459,012 B2
• Time in Patent Office: Days
• CPC Class Codes: G01R 1/20 Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
• CPC Class Codes: G01R 15/202 using Hall-effect devices Hall elements in arrangements for measuring electrical power G01R21/08
• CPC Class Codes: G01R 15/207 Constructional details independent of the type of device used
• CPC Class Codes: G01R 19/0092 measuring current only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 21/001 Measuring real or reactive component; Measuring apparent energy G01R21/01, G01R21/02, G01R21/08, G01R21/10 and G01R21/127 take precedence
• CPC Class Codes: G01R 21/06 by measuring current and voltage G01R21/08 - G01R21/133 take precedence
• CPC Class Codes: G01R 22/06 by electronic methods
• CPC Class Codes: G01R 22/063 related to remote communication
• CPC Class Codes: G01R 31/327 Testing of circuit interrupters, switches or circuit-breakers
• CPC Class Codes: G01R 33/07 Hall effect devices
• CPC Class Codes: G01R 33/09 Magnetoresistive devices
• CPC Class Codes: G01R 35/005 Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references G01R33/0035, G01R35/002 take precedence
• CPC Class Codes: G01R 35/007 Standards or reference devices, e.g. voltage or resistance standards, "golden references"
• CPC Class Codes: G01R 35/04 of instruments for measuring time integral of power or current

Abstract

Some embodiments include a method for monitoring usage of electrical power of a structure using an electrical power monitoring system. The structure can have one or more main electrical power lines that supply the electrical power to a first load in the structure. The method can include calibrating the electrical power monitoring system. A first raw current in the one or more main electrical power lines and first calibration data can be generated while calibrating the electrical power monitoring system. The method also can include storing the first calibration data and a measurement of the first raw current. The method additionally can include measuring a second raw current. The method further can include calculating a first measured current. The method additionally can include displaying the first measured current. Other embodiments of related systems and methods are disclosed.

Claims

1. A method for monitoring usage of electrical power of a structure using an electrical power monitoring system, the structure having one or more main electrical power lines that supply the electrical power to a first load in the structure, the method comprising:

calibrating the electrical power monitoring system, wherein a first raw current in the one or more main electrical power lines and first calibration data are generated while calibrating the electrical power monitoring system;

storing the first calibration data and a measurement of the first raw current;

measuring a second raw current;

calculating a first measured current; and

displaying the first measured current.

2. The method of claim 1, wherein calculating the first measured current comprises:

if the second raw current is not within a first predetermined amount of the first raw current, performing a first recalibration of the electrical power monitoring system comprising;

calibrating the electrical power monitoring system, wherein a third raw current in the one or more main electrical power lines and second calibration data are generated while performing the first recalibration of the electrical power monitoring system;

storing the second calibration data and a measurement of the third raw current; and

calculating the first measured current using the second calibration data; and

if the second raw current is within the first predetermined amount of the first raw current, calculating the first measured current using the first calibration data.

3. The method of claim 2, wherein the first predetermined amount is approximately 1 percent.

4. The method of claim 2, wherein the first predetermined amount is approximately 5 percent.

5. The method of claim 2, wherein the first predetermined amount is approximately 10 percent.

6. The method of claim 2, wherein the first predetermined amount is approximately 25 percent.

7. The method of claim 2 further comprising:

measuring a fourth raw current;

calculating a second measured current; and

displaying the second measured current.

8. The method of claim 7, wherein displaying the first and second measured currents comprises:

displaying the first and second measured currents on a display device.

9. The method of claim 7, wherein calculating the second measured current comprises:

if the third raw current is not within a second predetermined amount of the first raw current or the second raw current, performing a second recalibration of the electrical power monitoring system comprising;

calibrating the electrical power monitoring system, wherein a fifth raw current in the one or more main electrical power lines and third calibration data are generated while performing the second recalibration of the electrical power monitoring system;

storing the third calibration data and a measurement of the fifth raw current; and

calculating the second measured current using the third calibration data; and

if the third raw current is within the second predetermined amount of the first raw current or the second raw current, calculating the second measured current using the first calibration data or the second calibration data.

10. The method of claim 9, wherein the second predetermined amount is approximately 1 percent.

11. The method of claim 9, wherein the second predetermined amount is approximately 5 percent.

12. The method of claim 9, wherein the second predetermined amount is approximately 10 percent.

13. The method of claim 9, wherein the second predetermined amount is approximately 25 percent.

14. The method of claim 1, wherein calibrating the electrical power monitoring system comprises:

attaching a computational device of the electrical power monitoring system to a first phase line of the structure;

attaching a calibration device of the electrical power monitoring system to a second phase line of the structure; and

the first phase line of the structure is different than the second phase line of the structure.

15. The method of claim 14, wherein calibrating the electrical power monitoring system further comprises:

determining a first amplitude and a first phase of a first current in each current sensor of a sensing device of the electrical power monitoring system.

16. The method of claim 15, wherein:

attaching the computational device further comprises coupling a first load of the computational device to the first phase line; and

calibrating the electrical power monitoring system further comprises;

determining, while the first load is coupled to the first phase line, a second amplitude and a second phase of a second current in each of the current sensors of the sensing device of the electrical power monitoring system.

17. The method of claim 16, wherein calibrating the electrical power monitoring system further comprises:

coupling a second load of the calibration device to the second phase line; and

determining, while the second load is coupled to the second phase line, a third amplitude and a third phase of a third current in each of the current sensors of the sensing device of the electrical power monitoring system.

18. The method of claim 17, wherein calibrating the electrical power monitoring system further comprises:

determining calibration factors based at least in part on the first amplitudes, the first phases, the second amplitudes, the second phases, the third amplitudes, and the third phases of the current sensors of the sensing device of the electrical power monitoring system.

19. The method of claim 18, wherein calibrating the electrical power monitoring system further comprises:

determining the first calibration data based on the calibration factors, an amplitude of the first raw current, and a phase of the first raw current.

20. The method of claim 19, wherein:

calculating the first measured current comprises;

if the second raw current is not within a first predetermined amount of the first raw current, performing a first recalibration of the electrical power monitoring system comprising;

calibrating the electrical power monitoring system, wherein a third raw current in the one or more main electrical power lines and second calibration data are generated while performing the first recalibration of the electrical power monitoring system;

storing the second calibration data and a measurement of the third raw current; and

calculating the first measured current using the second calibration data; and

if the second raw current is within the first predetermined amount of the first raw current, calculating the first measured current using the first calibration data;

the first predetermined amount is approximately 1 percent;

the method further comprises;

measuring a fourth raw current;

calculating a second measured current; and

displaying the second measured current;

displaying the first and second measured currents comprises;

displaying the first and second measured currents on a display device;

calculating the second measured current comprises;

if the third raw current is not within a second predetermined amount of the first raw current or the second raw current, performing a second recalibration of the electrical power monitoring system comprising;

calibrating the electrical power monitoring system, wherein a fifth raw current in the one or more main electrical power lines and third calibration data are generated while performing the second recalibration of the electrical power monitoring system;

storing the third calibration data and a measurement of the fifth raw current; and

calculating the second measured current using the third calibration data; and

if the third raw current is within the second predetermined amount of the first raw current or the second raw current, calculating the second measured current using the first calibration data or the second calibration data; and

the second predetermined amount is approximately 1 percent.