Overheating of the resistance wire during pre-charge resistor operation is a common problem,which can lead to shortened operating life of the device and even lead to wire fusing and resistor fire.To solve this problem,the short circuit working condition of the developed aluminum shell pre-charge resis-tor was studied by numerical simulation and experimental research.The results show that the influence of voltage on the short-circuit durability of the resistor is much greater than that of the ambient tempera-ture.However,under the most severe environment(the voltage is 850 V and the ambient temperature is 85℃),the maximum short-circuit durability of the pre-charge resistor is still more than 5 seconds,and the heat storage of the ceramic resistance core is more than 14 000 J,which indicates that the developed pre-charge resistor has high reliability.It can meet the requirements of normal precharging and short cir-cuit overvoltage.The conclusions of this paper can provide ideas for the design of resistors for researchers.
关键词
高压短路/自然对流/预充电阻/数值仿真/实验研究
Key words
high voltage short circuit/natural convection/precharged resistance/numerical simulation/experimental research
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