Research On Safety Evaluation Of Cable Lines In Urban Distribution Network

At present,China’s power supply enterprises take "Condition Based Maintenance"(CBM)as the main maintenance mode of power equipment.As an emerging power equipment,the evaluation research and application of distribution network cable line is in the exploratory stage,which can not effectively reflect its operation safety and provide a strong basis for efficient maintenance.Therefore,it is of great significance to evaluate the safety of distribution network cable lines.The safety evaluation research takes cable line as the research object.Firstly,taking Tangshan cable line operation data as the sample,the fault mechanism is studied,and various safety risk factors are summarized.Secondly,the common evaluation methods are compared and analyzed,and the safety evaluation scheme of distribution network cable line is determined.Thirdly,based on the current situation of CBM,the selection method of evaluation index is proposed,and the safety evaluation model including 22 evaluation indexes is established.Thirdly,the calculation process of index weight is optimized by the combination weighting mode of analytic hierarchy process and entropy weight method;the specific evaluation research is carried out with fuzzy comprehensive evaluation as the implementation framework,the sub item safety evaluation and overall safety evaluation methods are determined,and the safety evaluation model is completed.Finally,an example is given to verify the feasibility and effectiveness.The evaluation model uses safety evaluation grade to represent the operation status and health degree of distribution network cable lines,which can effectively reflect its ability to resist safety risk factors and maintain stable operation,and make up for the limitation of traditional cable line evaluation method which only focuses on the core electrical performance.It can be used as a powerful basis for power supply enterprises to formulate maintenance strategies and carry out cable line maintenance efficiently.Therefore,it has high practical value.Figure 8;Table 28;Reference 48...