US3869665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detecting corona discharge in an enclosed electric device
Assignee: TOKYO SHIBAURA CO Ltd
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Filing: 1973-11-08
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Granted: 1975-03-04
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Expires: 1993-11-08
Abstract
Abstract In an enclosed electric device in which a conductor to be charged with a voltage is supported by an insulation support in its enclosing metal case, an electrode is disposed on or in the insulation support so as to provide a first static capacitance with respect to the conductor and a second static capacitance with respect to the metal case. A corona discharge detector is connected between the electrode and the metal case and adapted to detect, with the first static capacitance used as a coupling capacitor, a corona discharge occurring from the conductor and the insulation support.
Inventors
- 👤 Hiroshi Kenmochi
- 👤 Shinichi Menju
- 👤 Kunio Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:31
CPC Classifications
H; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H02B13/065; G; G01; G01R; G01R27/00; G01R27/02; G01R27/16; G01R27/18; H02G; H02G5/00; H02G5/06; H02G5/066; H02G5/068
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
In an enclosed electric device in which a conductor to be charged with a voltage is supported within an enclosing metal case by a plurality of insulation supports spaced apart from each other along said conductor, said enclosing metal case being filled with an insulating gas, a corona discharge detecting device comprising: a plurality of electrodes each coupled to a respective insulation support for providing a first static capacitance (C1) relative to said conductor and a second static capacitance (C2) relative to said enclosing metal case; and a corona discharge detector adapted to be connected in parallel with said second static capacitance (C2) and to detect, with said first static capacitance (C1) serving as a coupling capacitor, a corona discharge occurring from said conductor and insulation supports.
Claim 2
Dependent Claim
127 words
In an enclosed electric device in which a conductor to be charged with a voltage is supported within an enclosing metal case by a plurality of insulation supports spaced apart from each other along said conductor, said enclosing metal case being filled with an insulating gas, a corona discharge detecting device comprising: a plurality of electrodes each coupled to a respective insulation support for providing a first static capacitance (C1) relative to said conductor and a second static capacitance (C2) relative to said enclosing metal case; and a corona discharge detector adapted to be connected in parallel with said second static capacitance (C2) and to detect, with said first static capacitance (C1) serving as a coupling capacitor, a corona discharge occurring from said conductor and insulation supports.
Claim 3
Dependent Claim
89 words
A corona discharge detecting device according to claim 1 wherein: said metal case includes a plurality of serially connected unit metal cases; each of said insulation supports is sandwiched in an airtight manner between adjacent unit metal cases at the outer side thereof opposite to the inner side on which said conductor is supported; said electrodes are provided on the outer exposed surface of said outer side of said respective insulation supports; and said corona discharge detector is adapted to be connected between said electrodes and said metal case.
Claim 4
Dependent Claim
95 words
A corona discharge detecting device according to claim 1 wherein: said metal case includes a plurality of serially connected unit metal cases; each of said insulation supports is sandwiched in an airtight manner between adjacent unit metal cases at the outer side thereof opposite to the inner side on which said conductor is supported; said electrodes are embedded near said sandwiched portion and said respective insulation supports, and have respective outer connection conductors taken out therefrom; and said corona discharge detector is adapted to be connected between said outer connection conductors and said metal case.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |