Method and apparatus for monitoring a load

• US 7,969,156 B2
• Filed: 03/10/2008
• Issued: 06/28/2011
• Est. Priority Date: 03/30/2007
• Status: Active Grant

• Current Assignee: Vertiv Corporation (Vertiv Holdings Co.)
• Original Assignee: Liebert Corporation (Vertiv Holdings Co.)
• Inventors: Ferguson, Kevin Ray
• Primary Examiner(s): He; Amy
• Application Number:
  US12/045,262
• Publication Number:
  US 20080238404A1
• Time in Patent Office: 1,205 Days
• Field of Search: 324/522, 324/76.11
• US Class Current: 324/522
• CPC Class Codes: H02J 13/00002 characterised by monitoring
• CPC Class Codes: H02J 13/00016 using a wired telecommunication network or a data transmission bus
• CPC Class Codes: H02J 13/00022 using wireless data transmission
• CPC Class Codes: H02J 13/0005 the elements or equipment being or involving power plugs or sockets
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/30 State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
• CPC Class Codes: Y04S 40/124 using wired telecommunication networks or data transmission busses
• CPC Class Codes: Y04S 40/126 using wireless data transmission

Abstract

Applicants have created an improved method and apparatus for remotely monitoring an electrical load and assessing key attributes of power-related anomalies and line disturbances caused or created by the electrical load and qualifying their conformity to certain expected steady state conditions. The apparatus includes an intelligent power distribution module that can include a power output section, a power input section, a communication section, and related circuitry. The intelligent power distribution module can further include a memory section, a sensing device, a processing device, and a switch. The method for monitoring an electrical load having a current and voltage requirement supplied by an electrical source coupled to the load generally includes: interfacing a sensing module between the load and the electrical source; sensing one or more characteristics of the load; and determining the performance of the load sensing.

Claims

1. An intelligent power distribution module, comprising:

a power input section adapted to connect with and receive electrical power from a source;

a circuitry receiving power from the power input section and comprising

a memory section, a power-related sensing device, and a processing device;

wherein at least the processing device is adapted to determine the performance of the power-related sensing device;

wherein the circuitry is adapted to combine a calibrating current or voltage signal into an electrical signal of the power distribution module to create a combined signal;

measure one or more characteristics of a load; and

determine the performance of the load sensing;

wherein the circuitry is adapted to apply a mathematical transform to the combined signal in the module;

a power output section coupled to the circuitry and adapted to connect with and transfer electrical power to one or more loads; and

a communication section adapted to transmit data to and from the intelligent power distribution module.

2. The module of claim 1, wherein the mathematical transform comprises a wavelet transform.

3. The module of claim 2, wherein the sensing device is a current sensing device.

4. The module of claim 3, wherein the circuitry is adapted to calibrate the sensing device.

5. The module of claim 4, wherein the circuitry is adapted to measure one or more characteristics of the load sensed by the sensing device.

6. The module of claim 5, wherein the circuitry is adapted to automatically calibrate the sensing device.

7. The module of claim 6, comprising a display indicating the status of the module.

8. A method for monitoring an electrical load having a current and voltage requirement supplied by an electrical source coupled to the load, comprising:

interfacing a sensing module between the load and the electrical source for sensing one or more characteristics of the load;

combining a calibrating current or voltage signal with an electrical signal into a combined signal;

applying a mathematical transform to the combined signal in the sensing module;

measuring one or more characteristics of the load using the combined signal; and

determining the performance of the sensing of one or more characteristics of the load.

9. The method of claim 8, wherein applying a mathematical transform comprises applying a wavelet transform to the combined signal in the sensing module.

10. The method of claim 8, wherein the calibrating signal is a tapered sinusoidal form with a characteristic attack, stationary, and decay periods of operating frequency greater than an order of magnitude of a line frequency of the load.

11. The method of claim 10, further comprising communicating the characteristics of the load to a remote station.

12. The method of claim 11, further comprising calibrating the module to measure the characteristics of the load by means of software.

13. The method of claim 8, wherein the electrical load comprises an apparatus.

14. A method for monitoring an electrical load having a current and voltage requirement supplied by an electrical source coupled to the load, comprising:

interfacing a sensing module between the load and the electrical source for sensing one or more characteristics of the load;

combining a calibrating current or voltage signal with an electrical signal into a combined signal;

applying a mathematical transform to the combined signal in the sensing module;

measuring one or more characteristics of the load using the combined signal; and

analyzing power-related anomalies and line disturbances of the electrical load; and

validating the performance of the sensing of one or more characteristics of the load.

15. The method of claim 14, wherein applying a mathematical transform comprises applying a wavelet transform to the combined signal in the sensing module.

16. The method of claim 15, further comprising communicating the characteristics of the load to a remote station.

17. The method of claim 16, further comprising validating the performance of the load sensing by means of software.

18. A method for monitoring an apparatus connected to an electrical load having a current and voltage requirement supplied by an electrical source coupled to the apparatus and the load, comprising:

interfacing the apparatus between the load and the electrical source for sensing one or more characteristics of the apparatus;

combining a calibrating current or voltage signal with an electrical signal into a combined signal;

applying a mathematical transform to the combined signal in the sensing module;

measuring one or more characteristics of the apparatus using the combined signal; and

determining the performance of the sensing of one or more characteristics of the apparatus.

19. The method of claim 18, wherein applying a mathematical transform comprises applying a wavelet transform to the combined current signal in the apparatus.

20. The method of claim 18, wherein the calibrating current signal is a tapered sinusoidal form with a characteristic attack, stationary, and decay periods of operating frequency greater than an order of magnitude of a line frequency of the apparatus.