Measurement of cross-linking by products in crosslinked...

Details Measurement of cross-linking by products in crosslinked... Measurement of cross-linking by products in crosslinked...

G - Physics

01

N

G01N 21/71 (2006.01) G01N 33/44 (2006.01)

Patent

CA 2118197

At present, concentration of the crosslinking by- products crosslinked polyethylene used as insulation in high voltage cables is determined by a cumbersome, time consuming method involving taking a sample of the polymer, extracting volatile crosslinking by-products which affect the strength of the cable, and analyzing the by-products using a mass spectrometer. A novel method of in-situ measurement of the concentration of the crosslinking by-products in power cable insulation includes the step of detecting the thermoluminescence emitted during the initial heating required to reduce the crosslinking by-products in the polymer prior to the electrical tests. Measurement of the intensity of thermoluminescence provides a direct indication of the by- product concentration which can be correlated to the electrical strength of the insulation.

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