Coupling point temperature and current measuring system

• US 7,808,774 B2
• Filed: 08/30/2006
• Issued: 10/05/2010
• Est. Priority Date: 08/30/2006
• Status: Active Grant

• Current Assignee: Boon Hou Tay, Zengjun Li
• Original Assignee: Boon Hou Tay, Zengjun Li
• Inventors: Tay, Boon Hou, Li, Zengjun
• Primary Examiner(s): Edwards, Jr.; Timothy
• Application Number:
  US11/512,098
• Publication Number:
  US 20080068212A1
• Time in Patent Office: 1,497 Days
• Field of Search: 361/600, 702/130, 702/183, 702/185
• US Class Current: 361/600
• CPC Class Codes: G08C 15/00 Arrangements characterised by the use of multiplexing for the transmission of a plurality of signals over a common path

Abstract

A system for measuring temperature and current at coupling points in an electric distribution network. A monitor device is connected to a series of measuring devices using radio waves. The monitor device sequentially interrogates measuring devices to determine the temperature and current of each one. The measuring devices include a core surrounding the conductor which provides power by induction to each measuring device and also provides a measure of the current. A temperature sensor connected to the core provides the temperature measurement.

Claims

1. A temperature and current measuring system for detecting insecure coupling points in an electrical generation and distribution system, comprising:

a monitoring device, including a main processing unit that uses a parallel processor, a power supply unit and a transmission/reception module; and

at least one measuring device, including a main control unit, a transmission/reception module, a temperature sensor, a current measuring unit and a power unit for measuring temperature and current at coupling points of an electrical distribution network, said temperature sensor being in physical contact with insulation surrounding a junction point;

wherein said monitoring device receives data concerning the parameters from at least one measuring device remotely through radio waves transmitted between a transmission/reception module in each of the monitoring device and each measuring device;

wherein said main processing unit of said monitoring device processes received data from at least one measuring device to derive prognostic information and diagnostic information for a specific coupling point.

2. The system according to claim 1, wherein the coupling points are indoors.

3. The system according to claim 1, wherein the measuring device is usable indoors and outdoors.

4. The system according to claim 1, wherein the monitoring device and measuring devices establish a conjugated pairing of transmission power needed when one or more measuring devices are installed within enclosed areas.

5. The system according to claim 1, wherein the monitoring device uses a parallel processor chipset to compute the anticipated remaining lifespan of a detected insecure coupling point basing on the data received from the respective measuring device.

6. The system according to claim 5, wherein the processor uses Monte Carlo Simulation to derive the lifespan of the detected insecure coupling point.

7. The system according to claim 5, wherein the processor uses a 5-step Monte Carlo Simulation process to derive the lifespan of the detected insecure coupling point.

8. The system according to claim 7, wherein the five steps include:

Step 1;

Compute the actual reliabilities for a selected insecure coupling point, R(actual);

Step 2;

Generate N independent uniform variates (random numbers) in the interval 0 and 1 and designate them as the required coupling point'"'"'s reliability R(i), where i=1 to N;

Step 3;

Compare each Ri with R(actual) and consider ith part a failure when R(i) is less than or equal to R(actual) and consider ith part a success when R(i) is greater than R(actual);

Step 4;

The insecure coupling point'"'"'s reliability is estimated as;

R(comp) =Number of system successes/Total number of Monte Carlo trials;

Step 5;

If R(comp) is greater than R(actual), increase the utilization time in R(actual);

Wherein the entire procedure (Steps 1 to

     5) is repeated until R(comp) is equal to or slightly less than R(actual) and the utilization time for deriving R(actual) is the entire lifespan of the selected insecure coupling point.

9. The system according to claim 5, wherein the processor uses captured values of previous insecure couple points within its internal memory for deriving the lifespan of the detected insecure coupling point.

10. The system according to claim 5, wherein the processor issues a fault when it senses a complete loss of signal from said measuring device for that insecure coupling point.

11. The system according to claim 10, wherein the processor uses the detected fault and the data received for power lines of other phrases to issue fault information for a specific coupling point.

12. The system according to claim 5, wherein the processor can forward its prognostic data and fault data to an existing SCADA system.

13. A measuring device for determining temperature and current at a coupling point, comprising:

a transmission/reception module;

a temperature sensor being in physical contact with insulation surrounding a junction point for detecting growing heat of an insecure coupling point of said coupling point;

a power unit, including a core which surrounds a power line with a minimum 10 amp current flow, so as to induce an AC current in said core to provide power to said measuring device, for inductively receiving alternating current from a power line at said coupling point for providing power to said measuring device; and

a current measuring unit for detecting current in said power line using inductive coupling;

said transmission/reception module sending data concerning temperature and current by radio waves to a second transmission/reception module in a monitoring device.

14. The measuring device according to claim 13, further comprising:

a single and miniature chipset watch dog unit to reinitialize the control unit should a voltage of the power unit become too low or programming of the control unit fails, or whenever the control unit is not able to reset a timer of the watchdog unit within a set amount of time, an inactive state of the watchdog unit serving as a fault indication for the monitoring device.

15. The system according to claim 13, wherein the core is a cylindrical solid.

16. The system according to claim 13, wherein the core is elongated in length to house a large power unit in order to increase the transmission power for an enclosed area.

17. The system according to claim 13, wherein the core is a split cylindrical solid with a hinge.

18. The system according to claim 13, wherein the control unit receives data on temperature and current data and derives peak-to-peak current, root mean square current and effective other values for the coupling point.

19. The system according to claim 13, wherein the coupling point is indoors.

20. The system according to claim 13, wherein the measuring device is usable indoors and outdoors.

21. The measuring device according to claim 13, wherein the measuring device uses miniature chipset-electronics for size and space reduction in order to be enclosed within the core.

22. The measuring device according to claim 13, wherein the measuring device uses circuitry layout that wraps around within the material surrounding the core.

23. The system according to claim 13, wherein the core includes a coil which is enclosed in an insulating, fireproof, non-electrically shielded and weatherproof material.

24. The system according to claim 23, wherein a radio antenna for said transmission/reception module in the control unit is included in the material surrounding the coil.

25. The system according to claim 13, wherein the core takes the shape of the power line that it surrounds for maximizing the magnetic flux harnessing for its power unit.

26. The measuring device according to claim 25, wherein the core is pressed firmly against the power line that it surrounds.

27. The measuring device according to claim 26, wherein the measuring device is mounted on a power line installed vertically.

28. A system for measuring temperature and current at a coupling point of an electrical distribution network, comprising:

a monitoring device having a processing unit including a parallel processor with a display and keypad, a transmission/reception module that establishes a conjugated pairing of transmission power to the monitoring device and a power supply unit;

a plurality of measuring devices, each including a control unit, a transmission/reception module, a temperature sensor being in physical contact with insulation surrounding the junction point for measuring a growing heat at the coupling point, a power unit, including a core which surrounds a power line with a minimum of 10 amp current flow so as to induce an AC current in said core to provide power to said measuring device, for inductively receiving current from a power line at said coupling point, and a current measuring unit for detecting current in said power line;

said monitoring device receiving temperature and current data about said coupling point from a corresponding measuring device by connecting said transmission/reception module of the monitoring device with said transmission/reception module of said measuring device using radio waves;

wherein, when data is desired from a coupling point, the measuring device is identified by the keypad and the transmission/reception module of the monitoring device sends a request to the transmission/reception module of the identified measuring device, temperature and current data is retrieved and transmitted back to the monitoring device;

wherein the processing unit of the monitoring unit processes received data from at least one measuring device to derive prognostic information and diagnostic information for a specific coupling point.

29. The system of claim 28, wherein each of the monitoring and measuring devices include a watchdog circuit, the inactive state of the watchdog unit serves as a fault indication for the monitoring device.

30. The system according to claim 28, wherein the core is a cylindrical solid.

31. The system according to claim 28, wherein the core is elongated in length to house a large power unit in order to increase the transmission power for an enclosed area.

32. The system according to claim 28, wherein the core is a split cylindrical core with a hinge.

33. The system according to claim 28, wherein the core takes the shape of the power line that it surrounds for maximizing the harnessing of magnetic flux by the power unit.

34. The system according to claim 28, wherein the coupling point is indoors.

35. The system according to claim 28, wherein the measuring device is usable indoors and outdoors.

36. The system according to claim 28, wherein the core includes a coil which is enclosed in an insulating, fireproof, non-electrically shielded and weatherproof material.

37. The system according to claim 36, wherein a radio antenna for said transmission/reception module in the control unit is included in the material surrounding the coil.