Testing electric cables

Details Testing electric cables Testing electric cables

G - Physics

01

R

G01R 31/08 (2006.01) G01N 29/14 (2006.01) G01N 29/24 (2006.01)

Patent

CA 2055738

ABSTRACT A non-destructive technique for detecting and observing water-tree formation in an electric cable or a sample or model thereof comprises coupling an acoustic detector to the sample of model and observing acoustic signals in the presence of an alternating voltage stress sufficient to create a risk o-f water tree formation. The presence of water-trees is indicated by aperiodically repeated occurrence under the said electrical stress of acoustic ringdown signals. Observation at frequencies in the range of 20kHz to 2 MHz is appropriate.

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