Temperature Field Simulation Of 10kV Switch Cabinet Based On Fluent

As a switch cabinet widely used in power grid,high voltage switch cabinet plays a vital role in the safe operation of power grid.According to statistics,the number of faults caused by fever accounts for more than half of the total faults of switch cabinet every year,which seriously affects people's daily life and national economic construction.Therefore,analyzing the temperature field of switch cabinet,reducing the temperature rise of switch cabinet and improving the safety and reliability of switch cabinet have become an important link in the development of power grid.Although the temperature rise data measured by temperature rise test is relatively accurate,it needs a lot of manpower and material resources in the process,and the cost is high.With the continuous development of computer technology,we hope to simulate the temperature field distribution of switch cabinet by means of computer-aided design,and the design of high-voltage switch cabinet is improved to ensure the safety and reliability of its operation.In this paper,the 10 kV switch cabinet model KYN28A-12 is taken as the research object,and its temperature rise and heat dissipation are simulated by CFD simulation software Fluent.Firstly,the three-dimensional simplified model of switch cabinet is established by GAMBIT software.Bus room,circuit breaker room,cable room and instrument room are meshed separately,and boundary conditions are set.Secondly,the temperature field is simulated in three cases:fully enclosed,natural ventilation and forced ventilation.Finally,the influence of air velocity,position and area of air intake on temperature rise of switch cabinet is analyzed,and optimization suggestions are put forward.The following conclusions can be drawn from the simulation analysis.Under fully-closed conditions,the maximum temperature rise at the junction of bus and circuit breaker in switch cabinet exceeds the allowable temperature rise range.In the case of natural ventilation(wind speed is 3 n/s),the maximum temperature rise in switch cabinet cabinet decreases significantly compared with that in the case of closed switch cabinet,while the maximum temperature rise decreases slightly when the wind speed continues to increase,but the range is not obvious.Corresponding treatment of eontact surfaces between conductors to reduce contact resistance can significantly reduce the calorific value of components.The heat dissipation effect of the switch cabinet ean be enhanced by the design schemes of setting the air inlet at the top of the switch cabinet,setting the air outlet at the bottom,and increasing the area of the air inlet and outlet.