Strategy Research And Engineering Implementation Of Operation Status Evaluation For High Voltage Circuit Breakers In Heavy Haul Railway Line

Electrified heavy-duty railways,as an important component of the national comprehensive transportation system,are conducive to promoting the sustained and healthy development of the national economy and society.Traction power supply system is a power transformation and distribution system that provides power to heavy haul freight electric locomotive.The working state of any power component will affect the operation safety of the transportation line.High voltage circuit breakers are prone to degradation of insulation and mechanical properties during operation.Therefore,it is necessary to use relevant theories and technologies such as fuzzy mathematics,expert systems,and databases to develop a software system for evaluating the operating status of traction power supply high voltage circuit breakers.Firstly,based on a brief explanation of the basic concepts and internal parameters of traction power supply high-voltage circuit breakers,the paper analyzes the effects of temperature and environmental conditions on the working performance;Based on the relevant theories of fuzzy mathematics,a state evaluation index system for high-voltage circuit breakers was constructed,and the overall state level and evaluation index were graded;By analyzing the experimental data of high-voltage circuit breakers under different working conditions,a multi-level hierarchical comprehensive evaluation mechanism and related calculation model for circuit breakers were constructed;Based on the actual situation on site,the circuit breaker status is classified into four levels: excellent,good,average,and attention.Secondly,by comparing the characteristics of Analytic Hierarchy Process(AHP)and Principal Component Analysis(PCA)in calculating weights,a combination weight analysis method of AHP-PCA,which is more in line with practical engineering needs,is proposed to organically combine subjective factors of expert systems with potential information from measured data;Considering the ambiguity and randomness between the evaluation indicators and ratings of high-voltage circuit breakers,a new membership function model based on nonlinear features is proposed,which achieves a nonlinear relationship between the severity of the test indicators and the evaluation membership.Finally,combining relevant theories such as fuzzy mathematics,expert systems,and data mining,a high-voltage circuit breaker status evaluation model and corresponding implementation process suitable for heavy-duty railways are constructed;Using modern computer technology,database technology,and web technology,the main program flowchart and various subprogram flowchart of the online status evaluation software system for high-voltage circuit breakers based on cloud servers were designed,corresponding programs were written,and various types of experiments were conducted;The measured data shows that the online status evaluation software system for high-voltage circuit breakers has advantages such as stable operation,convenient operation,and user-friendly interface,and the accuracy of the evaluation results meets the expected design goals.