The dry type vehicle mounted traction transformer,despite light weight and high safety factor,features fre-quently fluctuating internal thermal field with the operating environment and load status.To achieve rapid calculation of the dynamic temperature of the windings of dry-type vehicle mounted traction transformers,by constructing a distributed dynamic thermal network topology based on the principle of thermoelectric analogy,this paper conducted a series of sim-ulation experiments using CFD models to explore the effects of operating parameters and duct size on heat dissipation per-formance.A calculation method was proposed for duct outlet temperature.Finally,the effectiveness of the dynamic tem-perature calculation model was verified based on the temperature rise test platform of the winding of the dry-type vehicle mounted traction transformer.The results show that for different structural parameters and time-varying operating scenari-os,the established dynamic temperature calculation model of the winding can accurately obtain the temperature distribu-tion and dynamic changes in the winding area.Compared with CFD numerical simulation,the model saves more than 99％of the time cost,and is helpful for the reasonable planning of the thermal capacity of dry vehicle traction transform-ers and further improving the design efficiency.
关键词
车载牵引变压器/热网络模型/动态温度计算/风道出口温度/热点温度
Key words
vehicle mounted traction transformer/thermal network model/dynamic temperature calculation/air duct outlet temperature/hotspot temperature
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