Power meter having fault tolerance

• US 8,493,231 B2
• Filed: 09/07/2007
• Issued: 07/23/2013
• Est. Priority Date: 09/07/2007
• Status: Active Grant

• Current Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Original Assignee: Power Measurement Ltd. (Schneider Electric SE)
• Inventors: Teachman, Michael E.
• Primary Examiner(s): Zimmerman, Brian
• Assistant Examiner(s): MURPHY, JEROLD B
• Application Number:
  US11/851,554
• Publication Number:
  US 20090066527A1
• Time in Patent Office: 2,146 Days
• Field of Search: 34087002-87003, 34087005-87006, 340 31- 39, 340/2.21, 340/2.24, 702 57- 78, 324 7611-157, 361/659, 361/661, 361/88, 361/93.1
• US Class Current: 340/870.01
• CPC Class Codes: G01R 11/25 Arrangements for indicating or signalling faults
• CPC Class Codes: G01R 22/10 using digital techniques
• CPC Class Codes: G01R 35/04 of instruments for measuring time integral of power or current

Abstract

A power meter having fault tolerance enhances the monitoring of electrical power by increasing the reliability of data output by the power meter having fault tolerance. The power meter having fault tolerance may enhance the monitoring process by transitioning from a faulty power monitoring device to a non-faulty power monitoring device without losing or corrupting power management data.

Claims

1. A power meter having fault tolerance, comprising:

a housing;

a first power monitoring device that performs a power management function and calculates first power management data, the first power monitoring device positioned within the housing;

a second power monitoring device that performs the power management function and calculates second power management data, the second power monitoring device positioned within the housing;

a controller in communication with the first power monitoring device through a first communication path, and with the second power monitoring device through a second communication path, where the first communication path and the second communication path do not share a common communication path; and

a network connection in communication with the controller,

where the controller is configured to receive the first power management data and the second power management data, and to selectively couple the first communication path or the second communication path to the network connection based on a corruption analysis of the first power management data and the second power management data and

where the first power monitoring device and the second power monitoring device are configured to generate energy consumption data when the other of the first power monitoring device and the second power monitoring device is serviced.

2. The power meter of claim 1, where the first power monitoring device generates a fault signal indicative of an operating state of the first power monitoring device.

3. The power meter of claim 1, where the first power monitoring device is further configured to verify that the first power monitoring data transmitted to the controller is substantially identical to the calculated first power monitoring data.

4. The power meter of claim 1, further comprising a display that displays the operating state of the first power monitoring device.

5. The power meter of claim 1, where the second power monitoring device generates a fault status signal indicative of an operating state of the second power monitoring device.

6. The power meter of claim 1, further comprising a display that displays the operating state of the second power monitoring device.

7. The power meter of claim 1, where the second power monitoring device is in communication with the first power monitoring device, and where the second power monitoring device monitors a first power monitoring device status signal.

8. The power meter of claim 1, where a communication path between the controller and the network connection comprises a bi-directional transmission medium.

9. The power meter of claim 7, where the first power monitoring device transmits the first power monitoring device status signal at a periodic interval.

10. The power meter of claim 9, where the periodic interval comprises about one second.

16. The power meter of claim 1, where a corruption analysis comprises failing to receive the first power management data.

11. A method of providing fault tolerance to a power meter, comprising:

receiving electrical data at an input of a single fault tolerant power meter;

performing a first power management function on the electrical data at a first power monitoring device to calculate first power management data;

performing a second power management function on the electrical data at a second power monitoring device to calculate second power management data;

detecting a fault status at the first power monitoring device based on a corruption analysis of the calculated first power management data; and

transmitting from the second power monitoring device the second power management data when it is determined that the first power management data is corrupt,

where the first power monitoring device and the second power monitoring device are configured to generate energy consumption data when the other of the first power monitoring device and the second power monitoring device is service.

12. The method of claim 11, where the act of detecting a fault at the first power monitoring device comprises receiving a fault status signal indicating the fault.

13. The method of claim 11, where the act of detecting a fault at the first power monitoring device comprises executing a loopback test at a communication device in communication with the first power monitoring device.

14. The method of claim 11, where the act of detecting a fault at the first power monitoring device comprises not receiving a response to a status query within a determined time period.

15. The method of claim 11, further comprising displaying an operational status of the first power monitoring device on a display.