US4063166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for locating a fault on a line near to a measuring location with the aid of substitute signals
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1976-05-24
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Granted: 1977-12-13
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Expires: 1996-05-24
Abstract
Abstract A method for locating a fault on a line wherein starting from a fault-free operating state of the line there is derived a substitute-measurement voltage signal which corresponds at least approximately to a frequency component of a line voltage both in magnitude and phase and is approximately independent of breakdown of the line voltage at least for a limited time interval. The substitute-measurement voltage signal is used to form at least one substitute-traveling wave signal and a substitute-evaluation signal.
Inventors
- 👤 Hans Glavitsch
- 👤 Michael Vitins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:59
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08; G01R31/081; G01R31/085; H; H02; H02H; H02H7/00; H02H7/26; H02H7/265
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A method of locating a fault on a line wherein at least at one measuring location there is formed at least one measurement voltage signal derived from a line voltage and at least one measurement current signal derived from a line current, producing from the measurement signals at least one traveling wave signal associated with the temporal progression prevailing at the measurement location of a traveling wave on the line, and forming an evaluation signal characterizing at least the direction of the location of a fault relative to the measuring location, the improvement comprising the steps of: starting from an operating condition of the line free of faults deriving a substitute-measurement voltage signal which at least approximately corresponds to a frequency component of the line voltage in magnitude and phase and is at least approximately independent of a breakdown of the line voltage for a limited time interval, and forming by means of the substitute-measurement voltage signal at least one substitute-traveling wave signal and a substitute-evaluation signal.
Claim 2
Independent Claim
167 words
A method of locating a fault on a line wherein at least at one measuring location there is formed at least one measurement voltage signal derived from a line voltage and at least one measurement current signal derived from a line current, producing from the measurement signals at least one traveling wave signal associated with the temporal progression prevailing at the measurement location of a traveling wave on the line, and forming an evaluation signal characterizing at least the direction of the location of a fault relative to the measuring location, the improvement comprising the steps of: starting from an operating condition of the line free of faults deriving a substitute-measurement voltage signal which at least approximately corresponds to a frequency component of the line voltage in magnitude and phase and is at least approximately independent of a breakdown of the line voltage for a limited time interval, and forming by means of the substitute-measurement voltage signal at least one substitute-traveling wave signal and a substitute-evaluation signal.
Claim 3
Dependent Claim
61 words
The method as defined in claim 1, including the step of using the original measurement voltage signal to form an evaluation signal and using the substitute-measurement voltage signal to form the substitute-evaluation signal, and producing a validity criterion dependent upon the momentary distance between the measuring location and the fault location for the substitute-evaluation signal and for the original evaluation signal.
Claim 4
Dependent Claim
45 words
The method as defined in claim 2, wherein the validity criterion for the substitute-evaluation signal and the original evaluation signal is formed by carrying out a comparison of a momentary magnitude of the measurement voltage signal or a magnitude derived therefrom with a reference magnitude.
Claim 5
Dependent Claim
38 words
The method as defined in claim 3, further including the step of using as the reference magnitude a magnitude which changes in the same sense as the substitute-measurement voltage signal for the comparison with the measurement voltage signal.
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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) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |