An intelligent and quick evaluation method for the insulation reliability of xlpe cable terminals

Abstract

The present invention is an intelligent and rapid evaluation method for the insulation reliability of XLPE cable terminals. In the present invention, firstly, a cable leakage current test platform is built to test the leakage current of the tested XLPE cable; the data collector (7) collects the current every 5s Data, each round of collection lasts 20 minutes, and lasts for 10 rounds in total; then the leakage current coefficient matrix Q is obtained, and then the XLPE cable terminal insulation reliability factor δ is obtained from the leakage current coefficient matrix Q and the measured leakage current data, and the insulation reliability of the XLPE cable terminal An assessment is performed to provide the basis for ensuring that the cable will perform safely. The beneficial effect of the present invention is that it can quickly and conveniently test the insulation performance of the cable to be tested, has the advantages of simple on-site wiring, simple and easy-to-understand operation steps, rigorous and reliable calculation process, and can perform insulation reliability tests on XLPE cables in operation. Prediction in advance can avoid accidents such as cable explosion and breakdown due to problems such as XLPE cable insulation aging, and improve the operational reliability of the distribution network system.

Description

technical field [0001] The invention belongs to the field of XLPE cable insulation reliability evaluation, and in particular relates to an intelligent and quick evaluation method for XLPE cable terminal insulation reliability 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 insulation. [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...

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 prone 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 insulation

[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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