US4208691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of inverter circuit-breaker
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1978-09-21
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Granted: 1980-06-17
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Expires: 1998-09-21
Abstract
Abstract A direct current, high-speed circuit breaker which is connected in series at the direct current side of one of a plurality of inverters connected in parallel in a high voltage transmission system, and which is caused to open when the magnitude of the direct current to the one inverter exceeds a threshold value, is further controlled to open in response to the occurrence of a commutation failure only when such failure occurs simultaneously with reduction of the commutation voltage of the one inverter below a rated value by more than a first predetermined magnitude such that proper operation of the one inverter is no longer assured, and the threshold value of the direct current is increased from a normal value to a selected higher value in response to a reduction of the commutation voltage below the rated value by more than a second predetermined magnitude which is less than the first predetermined magnitude.
Inventors
- 👤 York Rogowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:29
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1203; H02H7/1206
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
184 words
In a method for operating a direct current, high-speed circuit breaker connected in series at the direct current side of one of a plurality of inverters connected in parallel in a high voltage transmission system, which method includes opening the circuit breaker when the magnitude of the direct current to the one inverter exceeds a threshold value, the improvement comprising: monitoring the operation of the one inverter to provide an indication of each commutation failure which it experiences; monitoring the commutation voltage at the output of the one inverter; opening the circuit breaker in response to appearance of such a commutation failure indication only when such indication occurs simultaneously with reduction of the commutation voltage below a rated value by more than a first predetermined magnitude such that proper operation of the one inverter is no longer assured; and increasing the threshold value of the direct current from a normal value to a selected higher value in response to a reduction of the commutation voltage below the rated value by more than a second predetermined magnitude which is less than the first predetermined magnitude.
Claim 2
Dependent Claim
184 words
In a method for operating a direct current, high-speed circuit breaker connected in series at the direct current side of one of a plurality of inverters connected in parallel in a high voltage transmission system, which method includes opening the circuit breaker when the magnitude of the direct current to the one inverter exceeds a threshold value, the improvement comprising: monitoring the operation of the one inverter to provide an indication of each commutation failure which it experiences; monitoring the commutation voltage at the output of the one inverter; opening the circuit breaker in response to appearance of such a commutation failure indication only when such indication occurs simultaneously with reduction of the commutation voltage below a rated value by more than a first predetermined magnitude such that proper operation of the one inverter is no longer assured; and increasing the threshold value of the direct current from a normal value to a selected higher value in response to a reduction of the commutation voltage below the rated value by more than a second predetermined magnitude which is less than the first predetermined magnitude.
Claim 3
Dependent Claim
48 words
A method as defined in claim 1 wherein the one inverter is of a type operating with a small voltage reserve and having a given stationary voltage limit, and the first predetermined magnitude of the commutation voltage reduction is selected to be slightly above such stationary voltage limit.
Claim 4
Independent Claim
37 words
A method as defined in claims 1 or 2 further comprising causing the first predetermined magnitude of the commutation voltage reduction to have a value dependent on the magnitude of the direct current to the one inverter.
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) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |