Research Of Failure Analysis And Periodic Maintenance Strategy Optimization For500kV Line Relay Protection

As the scale of the power grid continues to expand and the power grid architecture becomes more complex,the security of the power grid is increasingly dependent on the reliability of the relay protection system.In order to prevent the occurrence of large-scale power outage accidents caused by the failure of the relay protection system,the reliability of the relay protection system is studied,the failure mechanism is analyzed through a mathematical model,and necessary preventive measures are taken to minimize the relay protection The failure risk of the system is of great significance for improving the operation level of the power grid.Carrying out regular inspections on the relay protection system to discover and deal with the faults or defects in the system in time is an important means to prevent the failure of protection.In a huge power grid,due to its high voltage level and high importance factor,the500 kV line protection configuration and related secondary circuits are relatively complicated,which leads to a high risk,a lot of content,and a lot Long inspection time.The analysis and research and strategy optimization of the 500 kV line protection definite inspection process are of great significance to the improvement of the entire grid operation and maintenance level.In view of this,the main work of this article includes:(1)This paper analyzes and introduces the relay protection system and components of500 kV Line,studies the factors that lead to the failure of the relay protection system of 500 kV Line,establishes the failure model of the relay protection system of 500 kV Line through the fault tree method,analyzes the reliability and failure mechanism of the relay protection system of 500 kV Line,and finds out the weak links of the relay protection system of 500 kV Line;(2)This paper introduces the current regulations and contents of the regular inspection of500 kV Line Relay Protection,and analyzes the essence and connotation of the regular inspection of 500 kV Line relay protection.By analyzing the influence of the regular inspection period on the system reliability,the shortcomings of the original inspection process can be found: the lack of operation effectiveness,low operation efficiency and operation Highrisk and unreasonable periodic inspection;(3)On the premise of ensuring the reliability of the relay protection system,this paper studies and analyzes the items and periods of the regular inspection of the protection,finds out the method to obtain the items and the optimal period of the regular inspection;according to the key point of the regular inspection of the protection-the whole group of tests,through improving the wiring way to shorten the time of the regular inspection and improve the quality of the regular inspection;develops the tester for the export pressure plate to improve the efficiency of the test for the export pressure plate 。And through the analysis of examples and the practical results of field work,the application effect of the above optimization strategy in engineering practice is verified,and the final conclusion is drawn.