ACOUSTIC APPARATUS AND ACOUSTIC SENSOR APPARATUS INCLUDING A CLAMP

• US 20120092020A1
• Filed: 10/18/2010
• Published: 04/19/2012
• Est. Priority Date: 10/18/2010
• Status: Abandoned Application

• Current Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Original Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Inventors: ZHOU, Xin, GASS, Dale L., PAHL, Birger, YANNIELLO, Robert
• Application Number:
  US12/906,256
• Publication Number:
  US 20120092020A1
• Time in Patent Office: Days
• US Class Current: 324/537
• CPC Class Codes: G01R 31/086 in power transmission or distribution networks, i.e. with interconnected conductors
• CPC Class Codes: G01R 31/1209 using acoustic measurements acoustic measurements G01H3/00
• 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 31/66 Testing of connections, e.g. of plugs or non-disconnectable joints testing for incorrect line connections G01R31/55

Abstract

An acoustic sensor apparatus includes a housing; a clamp structured to clamp together the housing and an electrical power conductor; an acoustic sensor structured to detect acoustic noise from the electrical power conductor and output a signal; and a circuit structured to detect an electrical conductivity fault from the signal.

Claims

1. An acoustic sensor apparatus comprising:

a housing;

a clamp structured to clamp together said housing and an electrical power conductor;

an acoustic sensor structured to detect acoustic noise from said electrical power conductor and output a signal; and

a circuit structured to detect an electrical conductivity fault from the signal.

2. The acoustic sensor apparatus of claim 1 wherein a preload is applied to the acoustic sensor by a compression element.

3. The acoustic sensor apparatus of claim 2 wherein the compression element is a loaded compression spring.

4. The acoustic sensor apparatus of claim 1 wherein said housing is a metallic housing or an insulative housing having a metal coating structured to provide EMI shielding.

5. The acoustic sensor apparatus of claim 4 wherein said metal coating is a thin film coating.

6. The acoustic sensor apparatus of claim 1 wherein said clamp is disposed through said housing.

7. The acoustic sensor apparatus of claim 6 wherein said electrical power conductor is a rectangular bus bar;

and wherein said clamp is structured to clamp together said housing and said rectangular bus bar.

8. The acoustic sensor apparatus of claim 6 wherein said electrical power conductor is a power cable having a circular or elliptical cross section;

and wherein said clamp is structured to clamp together said housing and said power cable.

9. The acoustic sensor apparatus of claim 1 wherein said circuit comprises a communication device structured to communicate with a remote device upon detection of the electrical conductivity fault.

10. The acoustic sensor apparatus of claim 9 wherein said communication device is a wireless transmitter or a wireless transceiver.

11. The acoustic sensor apparatus of claim 1 wherein said circuit is powered by a battery or a parasitic power supply.

12. The acoustic sensor apparatus of claim 11 wherein said parasitic power supply includes a current transformer.

13. The acoustic sensor apparatus of claim 1 wherein said acoustic sensor is a piezoelectric element.

14. The acoustic sensor apparatus of claim 1 wherein said electrical conductivity fault is a glowing contact.

15. The acoustic sensor apparatus of claim 1 wherein said housing includes an insulation spacer coupled to said acoustic sensor and being external to said housing;

and wherein said clamp is further structured to clamp together said insulation spacer and said electrical power conductor.

16. The acoustic sensor apparatus of claim 1 wherein said acoustic sensor is further structured to generate an acoustic signal.

17. The acoustic sensor apparatus of claim 1 wherein said signal is a first signal;

and wherein said circuit comprises;

an amplifier structured to amplify the first signal and output a second signal;

a peak detector structured to input the second signal and output a third signal; and

a processor structured to process the third signal and detect the electrical conductivity fault therefrom.

18. The acoustic sensor apparatus of claim 1 wherein said acoustic sensor is housed within said housing.

19. The acoustic sensor apparatus of claim 1 wherein said clamp comprises:

a first clamp portion disposed within said housing and engaging said acoustic sensor,

a second clamp portion disposed outside of said housing and being structured to engage said electrical power conductor,

a threaded coupler passing through said first clamp portion and through said housing, said threaded coupler having a first end and an opposite second threaded end threadably coupled to said second clamp portion, and

a rotatable member coupled to and structured to rotate along the first end of said threaded coupler in order to move up or down to pull or push said second clamp portion and clamp or unclamp, respectively, said housing, said electrical power conductor and said second clamp portion.

20. The acoustic sensor apparatus of claim 19 wherein said second clamp portion has an insulative cushion structured to insulatively engage said electrical power conductor.

21. The acoustic sensor apparatus of claim 19 wherein said rotatable member is a circular fastening knob threaded to said threaded coupler.

22. An acoustic apparatus for an electrical power conductor, said acoustic apparatus comprising:

a housing;

a clamp structured to clamp together said housing and said electrical power conductor; and

at least one of;

(a) an acoustic sensor structured to detect acoustic noise from said electrical power conductor and output a signal, and a circuit structured to detect an electrical conductivity fault from the signal, and

(b) an acoustic transmitter structured to generate acoustic noise to mimic acoustic noise induced by an electrical conductivity fault.