US3706927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring the absolute distance to a leakage fault in an electrical conductor
Assignee: Individual
•
Filing: 1971-04-27
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Granted: 1972-12-19
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Expires: 1991-04-27
Abstract
Abstract A bridge circuit is calibrated with a variable resistor in the loop across the current detector which includes an unfaulted as well as the faulted conductor. A potentiometer resistor making up the other loop across the current detector is set in accordance with the known length of the faulted conductors prior to adjustment of the variable resistor. This calibration occurs with the current source connected between the potentiometer contact and another unfaulted conductor. The measurement is accomplished by adjusting the contact when the current source is connected between the potentiometer contact and the fault.
Inventors
- 👤 Gustaf I Jedvall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:19
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
205 words
A method for measuring with a bridge circuit the distance to a leakage fault in one of the conductors of a cable when it is connected to an unfaulted conductor aT a remote point beyond the fault and the bridge has an equipotential indicator, a first loop across said indicator which includes the faulted and an unfaulted conductor in series with a variable resistor, a second loop across said indicator including a potentiometer resistor having an adjustable tap, and a current source selectively connectable at one time between the variable tap of said potentiometer resistor and another unfaulted conductor, which conductor is connected at the remote point with the faulted conductor, or at another time to the fault itself, comprising the steps of adjusting the tap of the potentiometer resistor to a point corresponding to the total length of the faulted conductor; adjusting the variable resistor to balance the bridge so that a zero indication is produced on said indicator with the current source connected to said other unfaulted conductor; and adjusting the tap of said potentiometer resistor to balance said bridge when said current source is connected to said fault so that the position of the tap corresponds to the distance to the fault.
Claim 2
Independent Claim
205 words
A method for measuring with a bridge circuit the distance to a leakage fault in one of the conductors of a cable when it is connected to an unfaulted conductor aT a remote point beyond the fault and the bridge has an equipotential indicator, a first loop across said indicator which includes the faulted and an unfaulted conductor in series with a variable resistor, a second loop across said indicator including a potentiometer resistor having an adjustable tap, and a current source selectively connectable at one time between the variable tap of said potentiometer resistor and another unfaulted conductor, which conductor is connected at the remote point with the faulted conductor, or at another time to the fault itself, comprising the steps of adjusting the tap of the potentiometer resistor to a point corresponding to the total length of the faulted conductor; adjusting the variable resistor to balance the bridge so that a zero indication is produced on said indicator with the current source connected to said other unfaulted conductor; and adjusting the tap of said potentiometer resistor to balance said bridge when said current source is connected to said fault so that the position of the tap corresponds to the distance to the fault.
References Cited (Backward Citations)
US1034609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |