Research On Working Tools Of 10kV Agricultural Distribution Network Bypass Without Power Failure

As an important part of the power system,the 10kV distribution network is a power infrastructure directly facing users,which has the characteristics of large power consumption,high load density and wide range of points.The insulation level of 10kV distribution equipment is relatively low,and there are many power supply equipment,which are prone to failure,so the workload of maintenance is large and the number of power outages is many.In order to reduce the impact of excessive power failure on customers and power supply enterprises’ load loss,live operation has gradually extended to the distribution network under the strong promotion of State Grid Corporation of China in recent years.However,due to the slow transformation and upgrading of distribution network lines and equipment,long service life,compact structure and small safety distance margin,the tools used in conventional live operation cannot adapt to the complex site environment.Therefore,it is of great engineering value and practical significance to study live operation tools that are more convenient and safer to operate and update and improve the related live operation tools of distribution network to improve the live operation level of distribution network lines and reduce safety risks.In this thesis,taking 10kV distribution network as the research object,based on the existing technology level and development needs in the domestic and overseas,the design and transformation of 10kV distribution network electrification cut-off,drainage line operation tools and equipment,the development of cut-off,drainage line complete set of tools,configuration design of the development of tools.For use in work,peeling,set fire to end at the end,shear line terminal,terminal quick replacement mechanism for the distribution network adaptive instruments related to development,realize 10 kv distribution network electric circuit,lead the mechanization,automation and modular,eliminate compact charged homework personnel due to the distance between a serious threat to the personal safety hidden trouble,improve work efficiency,improve service ability.In this thesis,the working state of J-clamp in 10kV distribution network is studied,and a multi-physical field coupling model is built to analyze the stress distribution,current distribution and temperature distribution.In order to verify the working performance of the newly developed tools,the related field tests were carried out,which provided the experimental basis for the development of the tools.The results show that:the equipment in this thesis have the characteristics of mechanization,modularization and semi-automation,which can effectively improve the operating level of distribution network disconnection and drainage line connection.In the multiphysical field coupling simulation of J-clamp,the stress on the contact surface between J-clamp and wire is much higher than that in other areas.The current is transferred smoothly on the Jclamp,and the current density distribution on the contact surface of the upper and lower clamp is relatively uniform.The temperature in some areas of the wire clamp rose obviously,but it was far lower than the standard of "State Grid Electric Power Safety Working Rules" and the allowable maximum operating temperature of J-type wire clamp.The communication test and electrical test are carried out on each end of the work in the application of the electrical apparatus test of the distribution network,and the test results meet the requirements of the project.At the same time,the relevant research results are also carried out in the field test,according to the field test,10kV distribution network live break,drainage line equipment has practical application conditions.