Insulation defect detection by high voltage electrode means

Details Insulation defect detection by high voltage electrode means Insulation defect detection by high voltage electrode means

1993-09-29

1995-05-16

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324515, 324522, 340647, G01R 3112

Patent

active

054164192

ABSTRACT:
In an apparatus for testing cable (comprising a metallic core jacketed by insulation) to detect localized defects on the insulation caused by its carbonization, the cable is moved in an axial path through an array of five ring electrodes radially spaced from that path and spaced from each other along the path by axial gaps. The first and fifth electrodes from left to right are grounded while high voltage circuits supply current to the middle three electrodes at DC voltages which causes (a) the second and fourth electrode, and (b) the third electrode to be positive and negative, respectively, relative to ground, and which voltages are high enough to produce flow of charge through the atmosphere adjacent the electrodes, and between the electrodes and the moving cable. Means are provided to monitor the current drain by the electrode array and to be responsive to an increase in such current caused by the coming into proximity with the electrode of a defect on the moving cable to produce a warning signal actuating a marker device to produce an ink spot on the cable. Signals caused by increases in such current resulting from traversal at different times by such a defect of separate axial gaps between the electrodes are subject to time delays and are then compared for time coincidence, and their failure to be appropriately time coincident results in non-actuation of the marker device.

REFERENCES:
patent: 2894204 (1959-07-01), Gambrill
patent: 3413541 (1968-11-01), Swim et al.
patent: 3491290 (1970-01-01), Peschel

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