Method for evaluating ageing life of cable insulation material for ship

Abstract

The invention discloses a method for evaluating the ageing life of a cable insulation material for a ship. The method comprises the following steps: carrying out accelerated thermal ageing experiments on the cable insulation material under the conditions of different ageing temperatures and ageing time so as to rapidly simulate the ageing process of a cable, acquiring an equation of the life of the cable based on elongation at break, calculating activation energy by using a time-temperature shift algorithm and deducing the extrapolation equation of the life; meanwhile, measuring the values of dielectric loss tangent of the insulation material within temperature and time nodes of the accelerated thermal ageing, selecting a curve located in a frequency range of 0.01 to 1 Hz for integration, acquiring an equation of the cable life based on the integral value of the dielectric loss tangent values, and correlating the life equation based on elongation at break with the life equation based on the integral value; and for a cable of a same kind, substituting the integral value of dielectric loss tangent values measured on site into the correlated equations so as to calculate the value of corresponding elongation at break, and then evaluating the life of the cable by using the extrapolation equation. The method provided by the invention can accurately and rapidly evaluate the cable life on site.

Description

technical field [0001] The invention provides a method for evaluating the aging life of a marine cable insulation material, which belongs to the technical field of electrical equipment insulation diagnosis. The involved patent classification number H01B basic electrical components. Background technique [0002] Aging of cable insulation material is an important reason for cable failure. Aging deteriorates various properties of the cable, eventually leading to insulation breakdown or short circuit. Under normal circumstances, low-voltage cables have good accessibility, and the amount of replacement work is small. Destructive methods can be used for cable life assessment. After a problem is found, the cable can be replaced in time to solve the problem. Therefore, the research on rapid and non-destructive life assessment methods for low-voltage cables has not received enough attention, and relevant technical materials are lacking. In some special occasions, such as ships, du...

AI Technical Summary

Problems solved by technology

In the current detection methods of cable insulation status, most of them are off-line and destructive experimental analysis methods, which will have a certain impact on the normal operation of the cable and the subsequent working life, and the experiment cycle is long, no matter in terms of work efficiency or cost reduction. needs improvement

The traditional method used to evaluate the insulation state of cables can no longer meet the current detection needs, and a new detection method that can ensure the accuracy of the detection results and meet the requirements of operability and efficiency needs to be proposed

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