Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1982-08-19
1985-04-09
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 66, 324 73R, G01R 3102, G01R 3112
Patent
active
045104352
ABSTRACT:
An apparatus for electrically testing a multi-core cable comprises a pick-up unit (6) for picking up a core separately on a one by one basis from a group of cores (101) at one end of the cable (100). Conductor wires of all of a plurality of cores (101) of a cable are collectively rendered conductive by a contact grip (25, 25') at one end of all the conductor wires the opposite ends of which are immersed into a conductive liquid (41) in a vessel (39) at the other end of the cable. The conductor wire of the picked up core is electrically separated from the other cores and power is supplied to the picked up conductor wire so that a current flows through the picked up wire, the conductive liquid, the conductor wires of other cores and through the contact grip to ground. A determining circuit (300) determines in response to the current that the picked up core is in a discontinuity state when the current is smaller than a first value and that an insulation breakdown has occurred between the picked up core and any other core of the cable when the current is larger than a second value which larger than the first value. Thus, both a discontinuity test and a defective insulation test are carried out simultaneously by the present apparatus.
REFERENCES:
patent: 1977707 (1934-10-01), Weitzer
patent: 3473112 (1969-10-01), Andrews
patent: 4158167 (1979-06-01), Tanno
patent: 4160947 (1979-07-01), Tanno
Dainichi-Nippon Cables Ltd.
Fasse W. G.
Kane, Jr. D. H.
Krawczewicz Stanley T.
Solis Jose M.
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