Busway joint parameter detection system

• US 8,576,082 B2
• Filed: 07/15/2010
• Issued: 11/05/2013
• Est. Priority Date: 07/15/2010
• Status: Expired due to Fees

• Current Assignee: Jones Group Forensic Engineers
• Original Assignee: Jones Group Forensic Engineers
• Inventors: Jones, David L.
• Primary Examiner(s): Previl, Daniel
• Application Number:
  US12/836,634
• Publication Number:
  US 20120013471A1
• Time in Patent Office: 1,209 Days
• Field of Search: 340/584, 340/635, 340/540, 340/588, 340/648, 340/657, 340/679, 340682-683, 340/589, 340601-602, 340/636.18, 340/686.6, 340/692
• US Class Current: 340/584
• CPC Class Codes: G01K 7/00 Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat giving results other than momentary value of temperature G01K3/00 ; Power supply therefor, e.g. using thermoelectric elements
• CPC Class Codes: G01R 31/69 of terminals at the end of a cable or a wire harness; of plugs; of sockets, e.g. wall sockets or power sockets in appliances
• CPC Class Codes: H02G 5/007 Butt joining of bus-bars by means of a common bolt, e.g. splice joint electrically conductive connections characterised by contacting members H01R4/58

Abstract

A system for detecting an improperly secured busway joint in an electrical distribution busway includes a busway joint parameter sensor, a transmission circuit and a remote computer. The busway joint parameter sensor is disposed so as to sense a selected parameter of the busway joint. The transmission circuit is in data communication with the busway joint parameter sensor and is configured to transmit real time busway joint parameter data. The remote computer is in data communication with the transmission circuit and is configured to present an indication upon detection of abnormal real time busway joint parameter data.

Claims

1. An electrical distribution busway system, comprising:

a. a busway joint that couples two segments of the electrical distribution busway to each other;

b. a busway joint parameter sensor coupled to the busway joint and configured to sense a selected parameter of the busway joint;

c. a transmission circuit in data communication with the busway joint parameter sensor and configured to transmit real time busway joint parameter data; and

d. a remote computer in data communication with the transmission circuit and configured to present an indication upon detection of abnormal real time busway joint parameter data.

2. The system of claim 1, wherein the busway joint parameter sensor comprises a joint temperature sensor configured to detect a joint temperature of the busway joint, wherein the real time busway joint parameter data is abnormal when the joint temperature is greater than an estimated normal operating temperature by a predetermined amount.

3. The system of claim 2, further comprising an ambient temperature sensor, spaced apart from the joint temperature sensor, configured to sense an ambient temperature of an environment in which the busway joint is disposed and wherein the remote computer is configured to calculate the estimated normal operating temperature based, at least in part, on the ambient temperature.

4. The system of claim 2, wherein the remote computer is configured to calculate the estimated normal operating temperature by:

a. determining an amount of current that flows through the busway; and

b. adjusting the estimated normal operating temperature by an amount corresponding to the amount of current that flows through the busway.

5. The system of claim 2, wherein the remote computer is configured to calculate the estimated normal operating temperature by adjusting the estimated normal operating temperature based in part on current flowing through the busway.

6. The system of claim 1, wherein the busway joint includes a bolt and wherein the parameter sensor comprises an ultrasonic transducer coupled to the bolt and configured to detect a pre-load of the bolt.

7. The system of claim 1, further comprising a current sensor configured to detect a current flowing through the busway, wherein the remote computer is configured to determine when the joint temperature is greater than a predicted joint temperature corresponding to the current.

8. The system of claim 1, wherein the transmission circuit comprises a mesh network transmitter configured to transmit data to the remote computer via a mesh network.

9. The system of claim 1, wherein the transmission circuit comprises a processor that is hard wired to the remote computer.

10. A method of detecting an improperly secured busway joint, comprising the steps of:

a. continuously sensing a parameter of the busway joint, wherein the busway joint couples two segments of an electrical distribution busway to each other, with a busway joint parameter sensor that is disposed adjacent to the busway joint;

b. transmitting data regarding the parameter to a remote computer;

c. determining with the computer when the data indicates that the parameter is abnormal; and

d. presenting an indication on a computer interface when the parameter is abnormal.

11. The method of claim 10, wherein the parameter sensor comprises a temperature sensor configured to sense a joint temperature of the busway joint and wherein the determining step comprises the step of:

a. comparing the joint temperature to an estimated normal operating temperature; and

b. indicating that the parameter is abnormal when the joint temperature is above the estimated normal operating temperature by a predetermined amount.

12. The method of claim 11, further comprising the steps of:

a. determining a joint current flowing through the joint; and

b. calculating with the computer the estimated normal operating temperature based, at least in part, on the joint current.

13. The method of claim 11, wherein the determining step further comprises the steps of:

a. measuring an ambient temperature at a predetermined distance away from the joint; and

b. calculating with the computer the estimated normal operating temperature based, at least in part, on the ambient temperature.

14. The method of claim 11, further comprising the steps of calculating the estimated normal operating temperature by:

a. determining an amount of current that is flowing through the busway; and

b. adjusting the estimated normal operating temperature by an amount corresponding to the amount of current that is flowing through the busway.

15. The method of claim 11, further comprising the steps of:

a. determining an estimated amount of current flowing through the busway joint; and

b. calculating the estimated normal operating temperature by adjusting the estimated normal operating temperature based in part on the estimated amount of current flowing through the busway joint.

16. The method of claim 10, wherein the step of transmitting data comprises the step of transmitting the data to a mesh network that is in data communication with the computer.

17. The method of claim 10, wherein the step of transmitting data comprises the step of transmitting the data to the computer via a hard wired data bus.

18. The method of claim 10, wherein the joint includes a bolt and the method further comprising the step of detecting a pre-load in the bold using an ultrasonic transducer coupled to the bolt.

19. A method of detecting an improperly secured busway joint in an electrical distribution busway, comprising the steps of:

a. continuously sensing a parameter of the busway joint with a busway joint parameter sensor that is disposed adjacent to the busway joint;

b. transmitting data regarding the parameter to a remote computer;

c. determining with the computer when the data indicates that the parameter is abnormal;

d. presenting an indication on a computer interface when the parameter is abnormal;

e. detecting a change in an estimated amount of current flowing through the busway joint;

f. detecting an actual lag between the change in the estimated amount of current flowing through the busway joint and a change in joint temperature;

g. comparing the lag to an expected lag corresponding to the change in the estimated amount of current flowing through the busway joint and the change in joint temperature; and

h. generating a lag abnormality indicator when the actual lag is different from the expected lag by a predetermined amount.

20. The method of claim 19, wherein the step of transmitting data comprises the step of transmitting the data to a mesh network that is in data communication with the computer.

21. The method of claim 19, wherein the parameter sensor comprises a temperature sensor configured to sense a joint temperature of the busway joint and wherein the determining step comprises the step of:

a. comparing the joint temperature to an estimated normal operating temperature; and

b. indicating that the parameter is abnormal when the joint temperature is above the estimated normal operating temperature by a predetermined amount.

22. The method of claim 21, further comprising the steps of:

a. determining a joint current flowing through the joint; and

b. calculating with the computer the estimated normal operating temperature based, at least in part, on the joint current.

23. The method of claim 21, wherein the determining step further comprises the steps of:

a. measuring an ambient temperature at a predetermined distance away from the joint; and

b. calculating with the computer the estimated normal operating temperature based, at least in part, on the ambient temperature.

24. The method of claim 21, further comprising the steps of:

a. determining an estimated amount of current flowing through the busway joint; and

b. calculating the estimated normal operating temperature by adjusting the estimated normal operating temperature based in part on the estimated amount of current flowing through the busway joint.