Power diagnostic system and method

• US 20070279068A1
• Filed: 05/31/2006
• Published: 12/06/2007
• Est. Priority Date: 05/31/2006
• Status: Abandoned Application

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Harres, Daniel N.
• Application Number:
  US11/443,864
• Publication Number:
  US 20070279068A1
• Time in Patent Office: Days
• US Class Current: 324/522
• CPC Class Codes: G01R 31/085 in power transmission or distribution lines, e.g. overhead
• CPC Class Codes: G01R 31/088 Aspects of digital computing
• CPC Class Codes: G01R 31/52 Testing for short-circuits, leakage current or ground faults
• CPC Class Codes: H02H 1/0015 Using arc detectors
• CPC Class Codes: H02H 3/28 involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus for transformers H02H7/045
• CPC Class Codes: H02H 3/44 responsive to the rate of change of electrical quantities

Abstract

A power diagnostic system and method for detecting faults is provided. The system includes a processor coupled to a plurality of sampling blocks; wherein the plurality of sampling blocks simultaneously perform current measurements and voltage measurements at a plurality of loads, based on a reference signal generated by a clock generator; wherein the sampling blocks measurements are sent to the processor via power cables that are also used to supply power to the plurality of loads. The method includes sampling currents and voltages at a power supply and at a plurality of loads; wherein the sampling is synchronized to a reference signal; transmitting sampled currents and voltages to a processor; comparing sampled currents and voltages with threshold values; and identifying faults if the sampled currents and voltages vary from the threshold values.

Claims

1. A power diagnostic system comprising:

a processor coupled to a plurality of sampling blocks;

wherein the plurality of sampling blocks simultaneously perform current measurements and voltage measurements at a plurality of loads based on a reference signal generated by a clock generator; and

the sampling blocks measurements are sent to the processor via power cables that are also used to supply power to the plurality of loads.

2. The power diagnostic system of claim 1, wherein the sampling block includes;

an instrumentation block for performing voltage and current sampling at power terminals for the plurality of loads; and

a synchronization block that synchronizes sampling of currents and voltages with the reference signal.

3. The power diagnostic system of claim 2, wherein the sampling block includes a codec block for transforming information received from the instrumentation block and a transceiver block.

4. The power diagnostic system of claim 3, wherein the transceiver block communicates with the processor.

5. A method for finding faults in a power system, comprising:

sampling currents and voltages at a power supply and at a plurality of loads;

wherein the sampling is synchronized to a reference signal;

transmitting sampled currents and voltages to a processor;

comparing sampled currents and voltages with threshold values; and

identifying faults if the sampled currents and voltages vary from the threshold values.

6. The method of claim 5, wherein the reference signal is generated by a clock generator.

7. The method of claim 5, wherein sampled currents and sampled voltages are transmitted to the processor is using Ethernet.

8. The method of claim 5, wherein sampled currents and sampled voltages are transmitted to the processor using power cables.

9. The method of claim 5, wherein the comparing step, comprising;

summing sampled load currents;

comparing sum of the load currents to a source current; and

comparing consecutive voltage readings.

10. The method of claim 5, wherein serial arcing is detected.

11. The method of claim 5, wherein parallel arcing is detected.

12. The method of claim 5, wherein ground arcing is detected.

13. The method of claim 5, wherein the power system is used in aircrafts.

14. The method of claim 5, wherein the power system is used in automotive systems.