Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-10-05
1984-01-03
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
1791753F, G01R 3108, H04B 346
Patent
active
044244797
ABSTRACT:
Circuitry, and associated methodology, for locating resistive shunt faults on a cable pair comprises DC source (120) and current sensors (121,122) which provide measured information utilized to estimate the resistance of the pair between the fault and a test position. In locating faults of a single-sided nature, two sets of measurements, either absolute or ratio type, are effected from the test position with the pair shorted at a point beyond the fault. In locating double-sided faults, three sets of current dependent measurements are taken at the measurement point. A reference pair is required for double-sided faults, and various strapping arrangements between the pair under test and the reference pair are required at a point beyond the fault depending on the required set of measurements.
REFERENCES:
patent: 3234459 (1966-02-01), Brazee
patent: 3248646 (1966-04-01), Brazee
Maloney, "Locating Cable Faults", IEE Trans. on Industry Appls., vol. IA-9, No. 4, Jul./Aug. 1973, pp. 380-394.
Bell Telephone Laboratories Incorporated
Karlsen Ernest F.
Peoples J. T.
Solis Jose M.
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