An intelligent method to evaluate the difference factor of xlpe cable leakage current after aging

Abstract

The invention is an intelligent method for evaluating the leakage current difference factor of XLPE cables after aging. The invention first builds a cable leakage current test platform to test the leakage current of the long-running XLPE cables; then calculates the No. 1 high-frequency current transformer (9) The leakage current characteristic parameters, disturbance factor and deviation factor of the XLPE cable; the leakage current characteristic parameters, disturbance factor and deviation factor of the No. 2 high-frequency current transformer (11), and finally the aging state of the XLPE cable is evaluated by calculating the leakage current difference factor. Thereby, the reliability of the power supply by the cable is improved. The beneficial effect of the invention is that it has the advantages of simple data collection operation, convenient and easy-to-understand on-site installation and connection steps, accurate and reliable calculation process, and can quickly evaluate the leakage current difference factor of the aged XLPE cable, so as to realize the insulation performance of the XLPE cable. The purpose of accurate and efficient evaluation.

Description

technical field [0001] The invention belongs to the field of evaluating the aging state of XLPE cable insulation, and in particular relates to an intelligent method for evaluating the difference factor of leakage current of XLPE cables after aging. Background technique [0002] Cross-linked polyethylene (XLPE) is widely used in modern urban distribution networks. It has many advantages, such as high reliability of power supply, good insulation performance, good resistance to water and chemical corrosion, etc., but its disadvantage lies in the mechanical stress Cracks are easy to occur under the environment, and due to the complex operating environment of the cable, the cable will age with the increase of the service life. In order to improve the reliability of the power supply, it is very important to evaluate the aging state of the cable. [0003] If the cable is in an aging state, if it is not replaced in time, insulation breakdown will easily occur, causing a large-scale ...

AI Technical Summary

Problems solved by technology

[0002] Cross-linked polyethylene (XLPE) is widely used in modern urban distribution networks. It has many advantages, such as high reliability of power supply, good insulation performance, good resistance to water and chemical corrosion, etc., but its disadvantage lies in the mechanical stress Cracks are easy to occur under the environment, and due to the complex operating environment of the cable, the cable will age with the increase of the service life. In order to improve the reliability of power supply, it is very important to evaluate the aging state of the cable

[0003] If the cable is in an aging state, if it is not replaced in time, insulation breakdown will easily occur, causing a large-scale power outage, which will have a great impact on industrial production and life.

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