Radial Temperature Field Analysis of Long-Span Transmission Wires Considering Turbulent Flow
Due to the different generation mechanism and flow characteristics of natural convection,laminar flow and turbulent flow,there are great differences in the heat transfer efficiency of overhead wires.In previous studies,only a single natural convection or laminar flow condition was considered to set a correction factor to correct the measured temperature of the conductor surface,which has hidden risks for the safe operation of the lines.Therefore,this paper uses COMSOL simulation software to establish a finite element model according to the internal structure characteristics of the overhead wire,and considers the magnetic field,solid and fluid heat transfer and convection conditions to build a multi-physical field coupling of electromagnetic heat-non-isothermal flow.The JLHA1/G6A-500/280 wire is taken as an example.The radial temperature of the conductor under natural convection,laminar flow and turbulent flow conditions is analyzed.The results show that under natural convection and laminar flow,the heat transfer environment of the conductor is stable,the radial temperature difference of the conductor is small,and the correction coefficient is small.In turbulent flow,the conductor heat transfer environment is more complicated,the radial temperature difference of the conductor is larger,and the correction coefficient is larger.Therefore,for conservative consideration,the inner core temperature of the conductor can be obtained by multiplying the measured maximum surface temperature of the conductor by the greater value of the correction factor 1.42～1.75.
large span overhead wireradial temperature differencefinite element simulationturbulent conditionswire heat transfer
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