Patent US3710240A successfully refreshed from Google Patents.
US3710240A
Expired / Lapsed
US
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Circuit arrangement for the detection of faults or points on inhomogeneous electric lines or cables according to the impulse reflection method utilizing an adjustable balancing network
Assignee: Siemens AG
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Filing: 1971-02-01
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Granted: 1973-01-09
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Expires: 1991-02-01
Abstract
Abstract A circuit arrangement for the detection of faulty or inhomogeneous points on electrical lines or cables, according to the impulse-reflection method, in which test impulses are applied to the line input over a bridge circuit and the reflecting impulse components are evaluated as to their magnitude and/or transit time; in an evaluation device which is arranged at the output side of the bridge circuit, the bridge circuit being adapted to be balanced by means of an adjustable balancing network in which there is disposed a variable ohmic resistance which is constructed in the form of an electrically-controlled resistance to which is connected a control circuit for effecting the adjustment thereof and adapted to have the resistance thereof varied by a control circuit employing a direct current or a low frequency alternating current bridge which contains a manually controllable element for effecting the desired resistance change. An electrically controlled capacitance may also be provided for the balancing of reactive components.
Inventors
- 👤 K Kuehnemann
- 👤 J Turban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:11
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08; G01R31/11
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
162 words
In a circuit arrangement for the detection of faulty or inhomogeneous places on electrical lines or cables according to the impulse-reflection method, in which test impulses are applied to the line input over a bridge circuit and the reflected impulse components are evaluated as to their magnitude and/or transit time in an evaluation device which is arranged at the output side of the bridge circuit, and in which the bridge circuit can be balanced by means of an adjustable balancing network, the combination of a variable ohmic resistance disposed in the balancing network, which resistance is constructed in the form of an electrically controlled resistance, and a control circuit operatively connected to said controllable resistance for effecting adjustment of the resistance value thereof, said control circuit including an adjustable element constructed for remote control operation, such adjustable element being located at the location of the evaluation device which is disposed at a distance from the line input and/or the balancing bridge network.
Claim 2
Dependent Claim
162 words
In a circuit arrangement for the detection of faulty or inhomogeneous places on electrical lines or cables according to the impulse-reflection method, in which test impulses are applied to the line input over a bridge circuit and the reflected impulse components are evaluated as to their magnitude and/or transit time in an evaluation device which is arranged at the output side of the bridge circuit, and in which the bridge circuit can be balanced by means of an adjustable balancing network, the combination of a variable ohmic resistance disposed in the balancing network, which resistance is constructed in the form of an electrically controlled resistance, and a control circuit operatively connected to said controllable resistance for effecting adjustment of the resistance value thereof, said control circuit including an adjustable element constructed for remote control operation, such adjustable element being located at the location of the evaluation device which is disposed at a distance from the line input and/or the balancing bridge network.
Claim 3
Dependent Claim
34 words
A circuit arrangement according to claim 1, wherein said control circuit therefor is in the form of a resistance bridge circuit containing an adjustable element operable to vary the characteristics of such resistance bridge.
Claim 4
Dependent Claim
106 words
A circuit arrangement according to claim 1, in which the line balancing network includes a variable capacitance which serves primarily for the balancing of the reactive components at the line input, wherein such variable capacitance is also an electrically controllable element, preferably in the form of a capacitance diode, and a control circuit connected thereto which contains an adjustable element for effecting such capacitance change, said last mentioned control circuit including an adjustable element constructed for remote control operation, such adjustable element being located at the location of the evaluation device which is disposed at a distance from the line input and/or the balancing bridge circuit.
Claim 5
Dependent Claim
49 words
A circuit arrangement according to claim 1, wherein the line balancing network comprises a fixed ohmic resistance operatively connected to said variable resistance, and a four-terminal network comprising at least one resistance-capacitance combination to form at least one shunt impedance, said resistances being in series with said four-terminal network.
Claim 6
Dependent Claim
17 words
A circuit arrangement according to claim 4, wherein said fixed and variable resistances are connected in series.
Claim 7
Dependent Claim
17 words
A circuit arrangement according to claim 4, wherein said fixed and variable resistances are connected in parallel.
Claim 8
Dependent Claim
58 words
A circuit arrangement according to claim 2, wherein said control circuit for said variable resistance comprises a resistance bridge circuit which contains the controllable element involved in a branch of such bridge and means including an amplifier forming a current path connecting the input of such resistance bridge with the output thereof whereby such bridge circuit is self-exciting.
Claim 9
Dependent Claim
20 words
A circuit arrangement according to claim 7, wherein the controllable resistance is coupled to said balancing network by respective capacitors.
Claim 10
Dependent Claim
65 words
A circuit arrangement according to claim 2, in which the line balancing network includes a variable capacitance which serves primarily for the balancing of the reactive components at the line input, wherein such variable capacitance is also an electrically controllable element, preferably in the form of a capacitance diode, and a control circuit connected thereto which contains an adjustable element for effecting such capacitancE change.
Claim 11
Dependent Claim
58 words
A circuit arrangement according to claim 9, wherein said control circuit for said variable resistance comprises a resistance bridge circuit which contains the controllable element involved in a branch of such bridge and means including an amplifier forming a current path connecting the input of such resistance bridge with the output thereof whereby such bridge circuit is self-exciting.
Claim 12
Dependent Claim
20 words
A circuit arrangement according to claim 10, wherein the controllable resistance is coupled to said balancing network by respective capacitors.
Claim 13
Dependent Claim
30 words
A circuit arrangement according to claim 11, wherein the controllable capacitance is coupled to said balancing network by respective capacitors, and is coupled to its control circuit by respective inductances.
Claim 14
Dependent Claim
18 words
A circuit arrangement according to claim 3, wherein the control circuit for the controllable capacitance comprises a potentiometer.
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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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |