FAULT DETECTION USING COMBINED REFLECTOMETRY AND ELECTRONIC PARAMETER MEASUREMENT

• US 20110181295A1
• Filed: 01/19/2011
• Published: 07/28/2011
• Est. Priority Date: 01/22/2010
• Status: Abandoned Application

• Current Assignee: LiveWire Innovation Inc.
• Original Assignee: LiveWire Test Labs, Inc.
• Inventors: Stephenson, James Craig, Diamond, Michael Paul, Haugen, Michael Lee, Kerr, Steven Andrew, Masquelier, Michael Paul
• Application Number:
  US13/009,694
• Publication Number:
  US 20110181295A1
• Time in Patent Office: Days
• US Class Current: 324/543
• CPC Class Codes: G01R 31/007 using microprocessors or computers
• CPC Class Codes: G01R 31/11 using pulse reflection methods
• CPC Class Codes: G01R 31/1272 of cable, line or wire insulation, e.g. using partial discharge measurements locating faults in cables G01R31/083
• CPC Class Codes: G01R 31/50 Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections testing of sparking plugs H01T13/58

Abstract

Systems and methods for detecting a fault in an electronic conductor are provided. Electronic parameter measurements are combined with reflectometry profiles to determine when faults are present on the electronic conductor.

Claims

1. A method of detecting a fault in an electronic conductor, the method comprising:

obtaining a measurement of an electronic parameter, wherein the electronic parameter is at least one of;

a current flowing in the electronic conductor and a voltage present on the electronic conductor; and

obtaining a reflectometry profile of the electronic conductor, wherein the reflectometry profile comprises a characterization of the electronic conductor at a same time as the measurement of the electronic parameter;

using the measurement of the electronic parameter in combination with the reflectometry profile to determine when a fault is present on the electronic conductor.

2. The method of claim 1, wherein the obtaining a reflectometry profile comprises performing a spread spectrum reflectometry measurement.

3. The method of claim 2, wherein the performing a spread spectrum reflectometry measurement comprises performing a correlation between a spread spectrum signal injected into the electronic conductor and a return signal extracted from the electronic conductor, wherein the result of the correlation is provided as the reflectometry profile.

4. The method of claim 2, wherein the obtaining a measurement of an electronic parameter comprises performing a current measurement.

5. The method of claim 4, wherein the performing a spread spectrum reflectometry measurement and the performing a current measurement occur simultaneously.

6. The method of claim 1, wherein a live operational signal is present in the electronic conductor.

7. The method of claim 1, wherein the using the measurement of the electronic parameter in combination with the reflectometry profile to determine when a fault is present on the electronic conductor comprises:

detecting when a current reflectometry profile differs from a previous reflectometry profile by more than a threshold at a time index; and

declaring a fault when the measurement of the electronic parameter is outside a defined range at the time index.

8. The method of claim 1, wherein the using the measurement of the electronic parameter in combination with the reflectometry profile to determine when a fault is present on the electronic conductor comprises:

detecting when the electronic parameter measurement is outside a defined range at a time index; and

declaring a fault when a current reflectometry profile differs from a previous reflectometry profile by more than a threshold at the time index.

9. The method of claim 8, wherein the declaring a fault further comprises:

declaring a fault only when the current reflectometry profile differs from a previous reflectometry profile at a point corresponding to a distance less than a distance to a load on the electronic conductor.

10. The method of claim 1, wherein the using the measurement of the electronic parameter in combination with the reflectometry profile to determine when a fault is present on the electronic conductor comprises:

detecting a potential fault condition based on either one of;

the electronic parameter measurement and the reflectometry profile; and

confirming the potential fault condition based on the other one of;

the electronic parameter measurement and the reflectometry profile.

11. The method of claim 10, wherein the confirming the potential fault condition further comprises declaring a fault only when the electronic parameter measurement and the reflectometry profile both indicate an anomalous condition at a same time.

12. The method of claim 11, wherein the confirming the potential fault condition further comprises declaring a fault only when the electronic parameter measurement and the reflectometry profile both indicate anomalous conditions at a plurality of corresponding time indexes.

13. The method of claim 11, wherein the confirming the potential fault condition further comprises declaring a fault only when the electronic parameter measurement and the reflectometry profile both indicate a compatible anomalous condition.

14. The method of claim 1, further comprising:

providing a type of fault output, wherein the type of fault is determined from the electronic parameter measurement; and

providing a distance to fault output, wherein the distance to fault is determined from a difference between a current reflectometry profile and a previous reflectometry profile.

15. A system for detecting a fault in an electronic conductor, the system comprising:

a means for obtaining a measurement of an electronic parameter, wherein the electronic parameter is at least one of;

a current flowing in the electronic conductor and a voltage present on the electronic conductor; and

a means for obtaining a reflectometry profile of the electronic conductor, wherein the reflectometry profile comprises a characterization of the electronic conductor at a same time as the measurement of the electronic parameter; and

a means for determining when a fault is present in the electronic conductor using both the measurement of the electronic parameter and the reflectometry profile.

16. The system of claim 15, wherein the means for obtaining a reflectometry profile comprises a spread spectrum reflectometer.

17. The system of claim 15, wherein the means for determining when a fault is present comprises:

a processor; and

a non-transitory computer readable medium having computer executable program instructions embodied therein, said computer executable instructions implementing a method for determining when a fault is present in an electronic conductor, wherein the method comprises;

detecting a potential fault condition based on either one of;

the electronic parameter measurement and the reflectometry profile; and

confirming the potential fault condition based on the other one of;

the electronic parameter measurement and the reflectometry profile, and confirming a fault only when both the electronic parameter measurement and the reflectometry profile indicate an anomalous condition at a same time index.

18. The system of claim 17, wherein the method for determining when a fault is present in an electronic conductor further comprises:

providing a type of fault output, wherein the type of fault is determined from the electronic parameter measurement; and

providing a distance to fault output, wherein the distance to fault is determined from a difference between a current reflectometry profile and a previous reflectometry profile.

19. A system for detecting a fault in an electronic conductor, the system comprising:

a reflectometer capable of being coupled to an electronic conductor at an injection point, the reflectometer configured to inject a test signal into the electronic conductor and obtain a reflectometry profile;

a measurement unit capable of being coupled to the electronic conductor at the injection point, the measurement unit configured to obtain an electronic parameter measurement of at least one of current and voltage at the injection point at the same time the reflectometer is obtaining a reflectometry profile; and

a processing circuit coupled to the reflectometer and the measurement unit, wherein the processing circuit is configured to combine the reflectometry profile and the electronic parameter measurement to determine a fault condition; and

a fault output from the processing circuit configured to provide a fault indication when a fault condition is detected.

20. The system of claim 19, wherein the processing circuit is further configured to:

provide a fault type output, wherein the fault type is determined from the electronic parameter measurement; and

provide a fault distance output, wherein the fault distance is determined from a difference between a current reflectometry profile and a previous reflectometry profile.

21. The system of claim 19, wherein the system is disposed within a handheld test instrument.

22. The system of claim 19, wherein the system is integrated into a utility power distribution network.

23. The system of claim 19, wherein the system is integrated into a public communications network.

24. The system of claim 19, wherein the system is integrated into an aircraft electrical subsystem.