Method of diagnosing electric wires and cables for deterioration

Details Method of diagnosing electric wires and cables for deterioration Method of diagnosing electric wires and cables for deterioration

1990-09-18

1992-12-29

Noland, Tom

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73866, G01N 322

Patent

active

051741601

ABSTRACT:
This invention relates to a method or apparatus by which comparatively low-voltage electric wires and cables laid at power stations and other locations can be diagnosed for deterioration of their polymer-insulation in a non-destructive way. The method or apparatus comprises applying a torsional force to the electric wire or cable, detecting the resulting repulsion as a torque, and estimating the degree of deterioration of the polymer-insulation in the electric wire or cable on the basis of the detected value of torque.

REFERENCES:
patent: 2980851 (1961-04-01), Henning
patent: 3683682 (1972-08-01), Jochmann
patent: 3724265 (1973-04-01), La Valle
patent: 4055992 (1977-11-01), Pizarello
patent: 4943757 (1990-07-01), Richter et al.
"Determination of Elastic Limit in Twisting"; Ind. Lab. (USA), vol. 36, No. 10, Oct. 1970; I. N. Kidin et al; pp. 1575-1578.

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