Measurement of crosslinking by-products in crosslinked polyethyl

Details Measurement of crosslinking by-products in crosslinked polyethyl Measurement of crosslinking by-products in crosslinked polyethyl

1994-10-14

1996-07-09

Gutierrez, Diego F. F.

Thermal measuring and testing

Thermal testing of a nonthermal quantity

2504591, 356311, G01N 2500, G21H 302

Patent

active

055338070

ABSTRACT:
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 thermo-luminescence 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.

REFERENCES:
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patent: 4652143 (1987-03-01), Wickersheim et al.
patent: 4870121 (1989-09-01), Bamji et al.
D'Silva, A. P. et al., "Analytical Applications of X-Ray Excited Optical Luminescence," Analytical Chemistry, vol. 6, No. 8 (Jul. 1977).

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