Patent US4937698A successfully refreshed from Google Patents.
US4937698A
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System for foreseeing deterioration in interrupting performance of vacuum interrupter
Assignee: Mitsubishi Electric Corp
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Filing: 1988-11-04
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Granted: 1990-06-26
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Expires: 2008-11-04
Abstract
Abstract A system for foreseeing deterioration in interrupting a performance of a vacuum interrupter, including a first measuring component for measuring potentials of electric lines connected to fixed and movable electrodes of the vacuum interrupter; a second measuring component for measuring a potential of an arc shield; a signal transmitting section for the transmission of potential signals resulting from the measurements in the first and second measuring component; a comparing section for making a comparison between the measured signal from the first measuring component and the measured signal from the second measuring component both transmitted through the signal transmitting section; and a judging section for judging that the fixed and movable electrodes have been deteriorated in their interrupting performance, on the basis of the result of the comparison made in the comparing section.
Inventors
- 👤 Hideaki Toya
- 👤 Tatsuya Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:28
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/668; G; G01; G01R; G01R31/00; G01R31/327; G01R31/3271; G01R31/3275; H01H9/00; H01H9/16; H01H9/168
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A system for foreseeing deterioration in interrupting performance of a vacuum interrupter having a fixed electrode, a movable electrode capable of making and breaking contact with said fixed electrode, and an arc shield insulated from said fixed and movable electrodes, comprising: first measuring means for measuring potentials of electric lines connected to said fixed and movable electrodes; second measuring means for measuring a potential of said arc shield; signal transmitting means for transmitting potential signals developed from the measurements of said first and second measuring means; comparing means coupled to said signal transmitting means for determining the difference between the potential signal of said first measuring means and the potential signal of said second measuring means, so as to determine the difference between the potential of one of said fixed and movable electrodes and the potential of said arc shield; and judging means for judging that said fixed and movable electrodes have deteriorated in interrupting performance when said difference has become almost zero.
Claim 2
Independent Claim
163 words
A system for foreseeing deterioration in interrupting performance of a vacuum interrupter having a fixed electrode, a movable electrode capable of making and breaking contact with said fixed electrode, and an arc shield insulated from said fixed and movable electrodes, comprising: first measuring means for measuring potentials of electric lines connected to said fixed and movable electrodes; second measuring means for measuring a potential of said arc shield; signal transmitting means for transmitting potential signals developed from the measurements of said first and second measuring means; comparing means coupled to said signal transmitting means for determining the difference between the potential signal of said first measuring means and the potential signal of said second measuring means, so as to determine the difference between the potential of one of said fixed and movable electrodes and the potential of said arc shield; and judging means for judging that said fixed and movable electrodes have deteriorated in interrupting performance when said difference has become almost zero.
Claim 3
Dependent Claim
36 words
A system for foreseeing deterioration in interrupting performance of the vacuum interrupter as set forth in claim 1, wherein said signal transmitting section is composed of an electro-optical transducer, an optical fiber and an opto-electrical transducer.
Claim 4
Dependent Claim
29 words
A system for foreseeing deterioration in interrupting performance of the vacuum interrupter as set forth in claim 1, wherein said signal transmitting section is constituted by a coaxial cable.
Claim 5
Independent Claim
178 words
A system for foreseeing deterioration in interrupting performance of a vacuum interrupter having a fixed electrode, a movable electrode capable of making and breaking contact with said fixed electrode, and an arc shield insulated from said fixed and movable electrodes, comprising: first measuring means for measuring potentials of electric lines connected to said fixed and movable electrodes; second measuring means for measuring a potential of said arc shield; signal transmitting means for transmitting potential signals developed from the measurement of said first and second measuring means, said signal transmitting means including an electro-optical transducer, an optical fiber and an opto-electrical transducer; comparing means coupled to said signal transmitting means for determining the difference between the potential signal of said first measuring means and the potential signal of said second measuring means, so as to determine the difference between the potential of one of said fixed and movable electrodes and the potential of said arc shield; and judging means for judging that said fixed and movable electrodes have deteriorated in interrupting performance when said difference has become almost zero.
Claim 6
Independent Claim
178 words
A system for foreseeing deterioration in interrupting performance of a vacuum interrupter having a fixed electrode, a movable electrode capable of making and breaking contact with said fixed electrode, and an arc shield insulated from said fixed and movable electrodes, comprising: first measuring means for measuring potentials of electric lines connected to said fixed and movable electrodes; second measuring means for measuring a potential of said arc shield; signal transmitting means for transmitting potential signals developed from the measurement of said first and second measuring means, said signal transmitting means including an electro-optical transducer, an optical fiber and an opto-electrical transducer; comparing means coupled to said signal transmitting means for determining the difference between the potential signal of said first measuring means and the potential signal of said second measuring means, so as to determine the difference between the potential of one of said fixed and movable electrodes and the potential of said arc shield; and judging means for judging that said fixed and movable electrodes have deteriorated in interrupting performance when said difference has become almost zero.
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |