Residual life evaluation method for low-voltage and multi-core cable

Abstract

The invention discloses a residual life evaluation method for a low-voltage and multi-core cable. The method comprises the steps of during the simulation test on the operation of a low-voltage and multi-core cable sample made of the insulating material, providing an Alzheimer's life evaluation equation on the actual working temperature of the low-voltage and multi-core cable; measuring the insulation value of the insulating material of the low-voltage and multi-core cable to obtain an insulation resistance of the cable at the end of the life thereof based on a cable residual life equation of the cable insulation value; calculating the service life of the cable based on the Alzheimer's life evaluation equation and the cable residual life equation; verifying the result of the cable residual life equation according to the judgment result of the Alzheimer's life evaluation equation; and estimating the residual life of the on-site low-voltage and multi-core cable according to the insulation value of the low-voltage and multi-core cable during the on-site project implementation process based on the cable residual life equation. Based on the method of the invention, the residual life of the on-site multi-core cable can be quickly and accurately evaluated. Therefore, the method provides an ample foundation for the maintenance and the replacement of the multi-core cable. As a result, the manpower, material resources and financial resources are greatly saved.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment diagnosis, and relates to the detection of the insulation state of low-voltage multi-core cables, in particular to a method for evaluating the remaining life of low-voltage multi-core cables. Background technique [0002] With the continuous improvement of the level of industrial automation, various large-scale equipment, such as space shuttles, ships and warships, trains and subways, and even ordinary cars, the internal cable network scale is increasing day by day. There are many kinds of internal cables, all kinds of power lines, high and low frequency signal lines are mixed together, and the electrical environment is very complicated. Due to environmental factors such as humidity, corrosion, high and low temperature, and the influence of external forces, short circuits, disconnections, and insulation aging often occur. question. These cable faults seriously affect equipment perfor...

AI Technical Summary

Problems solved by technology

These cable faults severely affect equipment performance and may even cause huge losses and disasters

[0003] If the insulation performance of the cable reaches the end of aging and is close to failure and is not replaced in time, it will not only cause damage to electrical equipment, but may even cause fire or explosion accidents, which may lead to the collapse of the entire system or even life-threatening

If the cable is replaced before it reaches the end of its aging life, it will cause huge waste

[0004] At present, there is no general standard for cable replacement at home and abroad. In addition, it is difficult to learn from the difference in the production process and material of cables at home and abroad. Therefore, it is urgent to study the relevant data of specific cables in the use process to provide sufficient information for cable replacement. in accordance with

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