Research On Reliability Evaluation Mechanism Of Relay Protection Device In Power Network

Through the investigation of recent years,the accident investigation of electric power accidents shows that the abnormal action of the relay protection system is one of the main causes of the accident,and the serious situation may cause large area power failure.As the relay protection system is to ensure that the power system is safe,stable operation of the most important part,how to ensure that its working condition is extremely reliable is particularly important.At present,the detection of the running quality of the relay protection system is only on the hardware detection,and can not carry out comprehensive quality assessment and state prediction on all aspects of the system.There is a certain lag.If you can develop a set of evaluation system,the relay protection equipment for the state and its reliability trends to assess and forecast,in advance to cope with the relay protection system failure risk plan,will be able to better ensure that the relay protection system action The reliability of the power system to improve the efficiency and security of power supply.This paper studies the operation data of the related relay protection equipment provided by a local electric power company,and analyzes the working parameters of the fault equipment,aging equipment and decommissioning equipment.Through a large amount of data processing and statistics,Protection risk assessment system.The system can simulate the change of failure rate of different types of relay protection equipment during operation,and give the current operational risk of the equipment on the basis of assessing the operation environment of the equipment and guide the maintenance and repair work of the equipment.On the basis of the three-parameter Weibull model,the paper chooses the operating parameters of the actual relay protection equipment of a local electric power company,including the basic information of equipment,equipment operation,equipment operating parameters,maintenance and maintenance records.By least squares After changing the trend function,the corresponding Markov model is made by the importance of the nature of the equipment and the mode of operation.The model is selected according to the size of the estimated value of the failure rate,and the current risk of the equipment is evaluated.Calculate the risk assessment value of the equipment,refer to the relevant provisions of the power company and overhaul strategy,give the corresponding strategy,to guide the relay protection equipment maintenance and maintenance work.Finally,through the GUI interface system of Matlab,the software of the system constructed by the paper is made,and the results of the calculation and the quality of the evaluation are run and tested.The failure rate parameter quality and risk assessment value of the evaluation equipment are given,Proved the reliability and feasibility of the system.In the process of running the software.The effectiveness and practicability of the software system are shown.System research and software production of the relevant projects played a theoretical support and practical application of the effect.