US3705346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring the distance to a leakage fault in an electrical conductor
Assignee: Individual
•
Filing: 1971-04-27
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Granted: 1972-12-05
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Expires: 1991-04-27
Abstract
Abstract A bridge circuit is calibrated with specific variable resistors set in accordance with the diameter of the faulted conductor and with the temperature of the faulted conductor. The bridge circuit is then modified by shorting out the variable resistor set in accordance with the conductor diameter and by substituting a potentiometer resistor for the two sections of the bridge circuit which make up one loop across the current detector. The potentiometer contact is then adjusted to balance the bridge, and the position of that adjustment is directly calibrated in terms of distance to the fault.
Inventors
- 👤 Gustaf I Jedvall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:19
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
214 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 a first variable resistor set in accordance with the diameter of the faulted conductor and serially connected through the faulted and the unfaulted conductors to a second variable resistor, a second loop across said indicator including a variable third resistor set in accordance with the temperature of the faulted conductor and serially connected to a fourth resistor, and a current source connected between the connection point on the faulted conductor and the junction of the third and fourth resistors; comprising the steps of adjusting said second resistor to balance the bridge so that a zero indication is produced on said indicator; modifying said bridge to eliminate said first resistor from said first loop, substitute a potentiometer resistor for said third and fourth resistors, and connect the current source between the fault and the variable contact of the potentiometer resistor; and adjusting said variable contact to balance said bridge so that the position of the contact corresponds to the distance to the fault.
Claim 2
Independent Claim
214 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 a first variable resistor set in accordance with the diameter of the faulted conductor and serially connected through the faulted and the unfaulted conductors to a second variable resistor, a second loop across said indicator including a variable third resistor set in accordance with the temperature of the faulted conductor and serially connected to a fourth resistor, and a current source connected between the connection point on the faulted conductor and the junction of the third and fourth resistors; comprising the steps of adjusting said second resistor to balance the bridge so that a zero indication is produced on said indicator; modifying said bridge to eliminate said first resistor from said first loop, substitute a potentiometer resistor for said third and fourth resistors, and connect the current source between the fault and the variable contact of the potentiometer resistor; and adjusting said variable contact to balance said bridge so that the position of the contact corresponds to the distance to the fault.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |