Process for the measurement of the specific capacity of a cable

Details Process for the measurement of the specific capacity of a cable Process for the measurement of the specific capacity of a cable

1983-02-01

1984-01-03

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

264 402, G01R 1152

Patent

active

044244800

ABSTRACT:
In a process and device for measuring the specific capacity of an electric cable by means of a cylindrical measuring electrode through which the cable is passed and between which and the cable conductor an alternating voltage is maintained, the capacitative current flowing between the cable conductor and a defined length of the electrode is determined by measurement of the currents flowing in the cable conductor at respective points located adjacent the ends of the defined length of the electrode, and obtaining the difference between the currents. This avoids the need for direct measurement of the capacitative current and thus enables screening electrodes at each end of the measuring electrode to be directly electrically connected to or integral with the measuring electrode so that they can be maintained at the same potential as the measuring electrode without the need for special electrical circuitry. The means for sensing the currents in the cable conductor may comprise toroidal transformers having measuring windings connected in opposition, or, alternatively, they may comprise Hall-effect elements.

REFERENCES:
patent: 3433858 (1969-03-01), Bauer
patent: 3459851 (1969-08-01), Macpherson
patent: 3748577 (1973-07-01), Jones
patent: 3914357 (1975-10-01), Cereijo
patent: 4257991 (1981-03-01), Kirjavainen
Bierenfeld et al.: "Capacitance Probe for . . . Controlling Coaxial Capacitance of Insulated Conductors"-Inspec.-Tech. Digest, No. 44-pp. 7, 8.

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