US3764883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring apparatus for preventing spark-overs at a high voltage installation
Assignee: Gema Switzerland GmbH
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Filing: 1972-10-26
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Granted: 1973-10-09
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Expires: 1992-10-26
Abstract
Abstract A monitoring apparatus for preventing a spark-over at a high voltage installation for corona electrodes comprising a highfrequency voltage source and a high voltage transformer, the secondary winding of which is coupled through the agency of a high voltage cascade with the corona electrode. The highfrequency voltage source is connected via a power amplifier, which starting from a certain value of its output current exhibits current limiting and decreasing output voltage characteristics, with the primary winding of the high voltage transformer. A comparator has its inputs coupled with the input and output respectively of the power amplifier and in the event the output voltage of the power amplifier is smaller than its input voltage interrupts the current circuit to the corona electrode through the agency of a cutoff mechanism.
Inventors
- 👤 Staad F Braun
- 👤 P Ribnitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:13
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/08; B05B5/10; H; H02; H02H; H02H3/00; H02H3/24; H02H3/26; H02H3/28; H02H7/00; H02H7/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
201 words
A monitoring apparatus for preventing spark-overs at a high voltage installation for corona electrodes, comprising a highfrequency voltage source, a corona electrode, a high-voltage transformer having a primary winding and a secondary winding, a high-voltage cascade arrangement connected in circuit with the corona electrode, the secondary winding of said high-voltage transformer being coupled with the corona electrode via said high-voltage cascade arrangement, a power amplifier means, which starting at a certain value of its output current exhibits current limiting and decreasing output voltage characteristics, said high-frequency voltage source being electrically coupled with the primary winding of the high-voltage transformer through the agency of said power amplifier means, comparator means having a first input, a second input and an output, said power amplifier means having an input and an output, one of the inputs of said comparator means being connected with the input of the power amplifier means and the other input of said comparator means being connected with the output of said power amplifier means, cutoff means for the corona electrode, said comparator means interrupting the current circuit to the corona electrode via said cutoff means when the output voltage of the power amPlifier means is smaller than its input voltage.
Claim 2
Dependent Claim
201 words
A monitoring apparatus for preventing spark-overs at a high voltage installation for corona electrodes, comprising a highfrequency voltage source, a corona electrode, a high-voltage transformer having a primary winding and a secondary winding, a high-voltage cascade arrangement connected in circuit with the corona electrode, the secondary winding of said high-voltage transformer being coupled with the corona electrode via said high-voltage cascade arrangement, a power amplifier means, which starting at a certain value of its output current exhibits current limiting and decreasing output voltage characteristics, said high-frequency voltage source being electrically coupled with the primary winding of the high-voltage transformer through the agency of said power amplifier means, comparator means having a first input, a second input and an output, said power amplifier means having an input and an output, one of the inputs of said comparator means being connected with the input of the power amplifier means and the other input of said comparator means being connected with the output of said power amplifier means, cutoff means for the corona electrode, said comparator means interrupting the current circuit to the corona electrode via said cutoff means when the output voltage of the power amPlifier means is smaller than its input voltage.
Claim 3
Dependent Claim
20 words
The monitoring apparatus as defined in claim 1, wherein the high-frequency voltage source comprises oscillator means with adjustable output voltage.
Claim 4
Dependent Claim
49 words
The monitoring apparatus as defined in claim 1, further including a first rectifier arranged between the input of the power amplifier means and said one input of the comparator and a second rectifier arranged between the output of said power amplifier means and said other input of said comparator.
Claim 5
Dependent Claim
59 words
The monitoring apparatus as defined in claim 1, further including potentiometer means electrically coupled between the input of the power amplifier means and said one input of the comparator means for adjusting the relationship between the amplifier input voltage to the amplifier output voltage at which the monitoring apparatus responds independent of the value of the amplifier input voltage.
Claim 6
Dependent Claim
42 words
The monitoring apparatus as defined in claim 1, wherein said cutoff means comprises a relay which can be actuated by said comparator means, said relay having a switching contact arranged in circuit between the high-frequency voltage source and the power amplifier means.
Claim 7
Dependent Claim
33 words
The monitoring apparatus as defined in claim 1, wherein the current value at which there occurs limiting of the output current can be adjusted by changing two components at the power amplifier means.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |