US3728619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustical corona locator having rotatable and pivotable transducers
Assignee: ABB Inc USA
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Filing: 1971-06-21
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Granted: 1973-04-17
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Expires: 1991-06-21
Abstract
Abstract Acoustical corona locating apparatus for use in determining the position of a corona discharge within the casing of a power transformer. Transducer apparatus, which contains at least two transducers, is attached to the wall of the transformer casing at a position where the corona produced ultrasonic wave may be detected. The transducers are rotated and pivoted to determine the direction and distance from the transducers to the corona source.
Inventors
- 👤 R Harrold
- 👤 W Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:21
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/33; G; G01; G01H; G01H1/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
Apparatus for locating corona discharges within a transformer casing, comprising first and second transducers which change ultrasonic waves to electrical signals, said transducers having a directional receiving pattern, supporting means which rigidly maintains the spacing and orientation of said transducers with respect to each other, said supporting means providing means for rotating said transducers around a first axis and for pivoting said transducers around a second axis which is perpendicular to the first axis, said supporting means and said transducers being adapted to be located at a first position relative to said transformer casing for receiving ultrasonic waves which are produced by corona discharges originating at a second position within said transformer casing.
Claim 2
Dependent Claim
113 words
Apparatus for locating corona discharges within a transformer casing, comprising first and second transducers which change ultrasonic waves to electrical signals, said transducers having a directional receiving pattern, supporting means which rigidly maintains the spacing and orientation of said transducers with respect to each other, said supporting means providing means for rotating said transducers around a first axis and for pivoting said transducers around a second axis which is perpendicular to the first axis, said supporting means and said transducers being adapted to be located at a first position relative to said transformer casing for receiving ultrasonic waves which are produced by corona discharges originating at a second position within said transformer casing.
Claim 3
Dependent Claim
27 words
The corona locating apparatus of claim 1 wherein the transducers and the supporting means are located on the outside of a transformer casing containing a fluid coolant.
Claim 4
Dependent Claim
49 words
The corona apparatus of claim 2 wherein the transducers and the supporting means are located within a housing member, said housing member containing a fluid similar to the fluid coolant contained within the transformer casing, said housing member being adapted for attachment to the outside of the transformer casing.
Claim 5
Independent Claim
111 words
A method of locating corona within a transformer casing comprising the steps of placing ultrasonic transducer apparatus containing first and second transducers at only one position on the outside of the transformer casing, the position of said transducer apparatus being selected to permit said transducers to receive ultrasonic waves produced by a corona discharge within said transformer casing, rotating said transducers around a first axis to determine a plane in which the corona is detected, pivoting said transducers around a second axis to determine the direction to the corona in said plane, and observing the phase shift in the ultrasonic waves which are received by said transducers when they are pivoted.
Claim 6
Independent Claim
111 words
A method of locating corona within a transformer casing comprising the steps of placing ultrasonic transducer apparatus containing first and second transducers at only one position on the outside of the transformer casing, the position of said transducer apparatus being selected to permit said transducers to receive ultrasonic waves produced by a corona discharge within said transformer casing, rotating said transducers around a first axis to determine a plane in which the corona is detected, pivoting said transducers around a second axis to determine the direction to the corona in said plane, and observing the phase shift in the ultrasonic waves which are received by said transducers when they are pivoted.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |