Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1977-11-14
1979-03-13
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
1791753F, G01R 3110
Patent
active
041444876
ABSTRACT:
A fault locating apparatus for locating high resistance leaks in telephone subscriber lines comprising circuitry for initially applying a low voltage to the line to ensure that the insulation and conductors are dry at the fault zone. When the drying is completed as indicated by a zero reading on an ammeter connected in the circuit, further circuitry is actuated to apply a brief high voltage to the line to cause a brief arc discharge at the fault. At this point, two operative options are made possible. The peak current flow during the arc may be read on a second ammeter providing a measure of the distance to the fault and the apparatus is disconnected or the low voltage application may be continued to sustain the arc until a weld is created at the fault between the line conductors. A feature of the apparatus is a timing circuit which controls means for applying a reverse potential to the line thereby extinguishing the arc at the fault while simultaneously inducing a weld between the conductors there. A reversing switch is also provided to reverse the polarities of the voltages as applied to the subscriber line conductors in a subsequent operation should the first attempt at creating a weld have been unsuccessful.
REFERENCES:
patent: 2707267 (1955-04-01), Gavin
patent: 3488580 (1970-01-01), Anderson et al.
Capacitor Discharge Generators and Cable Burning Equipment, Electrical Review, vol. 199, No. 20, Nov. 19, 1976 pp. 38 and 41.
Maloney, Charles A., Locating Cable Faults IEEE Transactions on Industry Applic. vol. IA-9, No. 4, Jul./ aug. 1973 pp. 380-394.
Bell Telephone Laboratories Incorporated
Kamstra William H.
Strecker Gerard R.
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