Cable Line Deterioration Monitoring And Life Prediction Based On Harmonic Diagnosis

In China,the scale of transmission and distribution cables is enormous.Since China’s economy is expanding and urbanization is speeding up,there is a growing need for power supply,which is driving up demand for transmission and distribution cables.The transmission and distribution cable market in China will continue to grow quickly due to the country’s expanding power industry and rising energy demand.The likelihood of an intrinsic failure brought on by the aging of the cable increases day by day as XLPE(Cross-linked polyethylene cable)matures over the course of its operating life.The safe and stable operation of the electrical system is significantly adversely affected by the aging of transmission and distribution cables,particularly in the following areas: 1)Increased risk of accidents: As transmission and distribution cables age,their electrical properties deteriorate and partial discharge and dielectric breakdown issues become more prevalent inside the cables,raising the possibility of accidents in the power system.2)lessen the reliability of the power supply: as transmission and distribution cables age,their insulation layers,conductors,and other components become more prone to corrosion and degradation.This results in deteriorated cable performance,which lowers the grid’s ability to provide reliable power.3)Impacting power quality: As transmission and distribution cables age,their electrical performance degrades,affecting the quality of the power transmitted as well as the stability of the power supply.Therefore,steps must be taken to monitor the deterioration trend of cables and predict their service life in order to provide monitoring indicators for the power system and ensure the safety and reliability of its operation.In conclusion,the aging of transmission and distribution cables has a significant negative impact on the safe and stable operation of the power system.The first part of this paper examines the connection between harmonic signals and cable degradation during cable operation using the mechanism of degradation harmonics produced by high-voltage cable degradation.The second part compares and contrasts harmonic signal differences under various cable degradation conditions,extracts the properties of cable harmonic signals using wavelet transform,and develops a corresponding cable harmonic signal monitoring terminal.Second,a diagnostic system is deployed in a centralized management device to diagnose the monitoring cable data uploaded by the terminal,and an expert database is used to analyze and diagnose the characteristics of harmonic signals as a way to monitor the operation of high-voltage cables,to judge the deterioration of cables according to the deterioration index.Finally,based on the development law of cable life,this paper tracks the deterioration trend of cables using historical data,calculates the failure time node of cables using the aging scale model of cables,and uses this to determine the remaining service life of cables.It also offers data support and recommendations for cable maintenance and replacement.Figure 75 Table 6 Reference 152...