Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-08-31
1983-08-16
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
1791753R, 1791753F, G01R 3108, H04B 346
Patent
active
043994024
ABSTRACT:
A methodology, and associated circuitry, for locating a resistive shunt fault coupling the cable shield and the conductors of the cable pair under test comprises the steps of: (i) measuring the open-circuited DC resistance (A.sub.1 and A.sub.2) of the pair from test locations (A and B) which straddle the fault; (ii) measuring the short-circuited DC resistance (A.sub.3) of the pair from one of the test points (A or B); and (iii) evaluating the resistance of one conductor of the pair between the fault and the location of the short circuit measurement according to a predetermined quadratic expression involving the three measured quantities. Sensitivity of the measurement technique is reduced by adding a resistor in series with said pair, at either location A or B, so that A.sub.2 is substantially equal to A.sub.1.
REFERENCES:
patent: 3234459 (1966-02-01), Brazee
patent: 3248646 (1966-04-01), Brazee
Maloney, "Locating Cable Faults"-IEEE Trans. on Industry Appls. vol. IA-9, No. 4, Jul./Aug. 1973-pp. 380-394.
Bell Telephone Laboratories Incorporated
Krawczewicz Stanley T.
Nimtz R. O.
Solis Jose M.
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