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Hardness-retention-rate-based rapid detection method of residual life of low-voltage cable

A technology of hardness retention rate and low-voltage cables, applied in the direction of testing dielectric strength, etc., can solve the problems of low-voltage cable insulation non-destructive testing methods that have not attracted enough attention, lack of standards and criteria, and low load voltage and current.

Active Publication Date: 2016-03-09
DALIAN UNIV OF TECH
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Problems solved by technology

However, this method is a destructive test, and the test period is relatively long. In addition, there are few cable samples that can be used for testing in some occasions, which leads to certain limitations in the evaluation of the cable insulation state by this method.
However, the daily load voltage and current of low-voltage cables are relatively small, and cable aging is a slow process, so that the insulation non-destructive testing method of low-voltage cables has not attracted enough attention, and there is also a lack of relevant standards and criteria.

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  • Hardness-retention-rate-based rapid detection method of residual life of low-voltage cable

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Embodiment Construction

[0023] In the first step, the accelerated aging test is carried out on the insulation material of the low-voltage cable to obtain the hardness value of the cable insulation layer at different temperatures and aging times, and the hardness retention rate value at different aging temperatures and aging times can be obtained from the formula (1);

[0024] 1) According to the national standard GB / T2951.11-2008 and the International Electrotechnical Commission standard IEC60811-1-1:2001, IDT, the cable insulation material sample is selected to make a dumbbell-shaped sample. The thickness of the dumbbell-shaped sample is 0.8mm-2.0mm, and the thickness difference is less than 0.1mm.

[0025] 2) According to the American thermal power station cable test specification and the IEC60216 standard, the accelerated aging temperature of the dumbbell-shaped sample is selected. 135°C, 150°C, 165°C and 180°C are the accelerated aging temperatures of low-voltage cable insulation materials.

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Abstract

The invention, which belongs to the technical field of insulation diagnoses of the electrical equipment, relates to a hardness-retention-rate-based rapid detection method of a residual life of a low-voltage cable, thereby carrying out detection diagnoses and residual life evaluation on the insulating state of the low-voltage rubber cable. The method comprises: a service life of a cable is evaluated by using a hardness retention rate; accelerated aging testing is carried out on a cable insulating material to obtain a service life equation in which the hardness retention rate of the cable changes with the aging temperature and the aging time; and then a residual life value of the cable is obtained by using the service life equation of the cable. Because the hardness detection method is a rapid and non-destructive detection method, the service life evaluation equation of the cable insulating state can be deduced only by measuring the insulating layer hardness value of the to-be-measured cable during field measurement; and evaluation and prediction can be carried out on the service life of the cable under each working temperature.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment insulation diagnosis, and relates to a method for quickly detecting the remaining life of a low-voltage cable based on a hardness retention rate, which detects, diagnoses, and evaluates the remaining life of the low-voltage rubber cable. Background technique [0002] With the gradual improvement of social automation, the electrical system is also becoming more and more complex, and cables are responsible for the important task of transmitting electrical energy and signals. Since the safe service life of the cable is not clearly required in the relevant technical specifications, the cable design safety life generally recognized in the industry is 20-30 years. However, in the actual working environment, affected by factors such as oil mist, heat, radiation, and machinery, the insulating layer material is prone to aging, resulting in a decrease in insulation performance or even failure, ...

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Application Information

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IPC IPC(8): G01R31/12
Inventor 王志强孟晓凯王进君李国峰
Owner DALIAN UNIV OF TECH
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