【摘要】 预充电阻工作时电阻丝常发生过热问题，这会导致设备的运行寿命减短，甚至出现电阻丝熔断及电阻器起火的问题。为了解决该问题，通过数值仿真及实验研究的方法对开发的铝壳预充电阻器进行了短路研究，结果表明：电压对电阻器的短路耐久能力影响远大于环境温度的影响，但是在最恶劣的环境(电压850 V,环境温度85℃)下，预充电阻器的最大短路耐久能力仍然超过5 s,陶瓷电阻芯的蓄热量超过14 000 J,这表明所开发的预充电阻器可靠性很高，可以满足正常的预充需求及短路过电压要求。本文研究结论可为科研人员电阻器的设计提供思路。更多还原

【Abstract】 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 resistor 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 temperature. 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 circuit overvoltage. The conclusions of this paper can provide ideas for the design of resistors for researchers.更多还原