摘要:
建立了矩形截面包覆材料交流功率损耗的数值计算模型,分析了铜包铝导电扁排断面形状结构对交流功率损耗的影响.结果表明:当断面积为S=600mm2时,功率损耗系数随扁排宽厚比b/a的增大而增加;断面积为S=800mm2和1000mm2时,随宽厚比b/a的增加,功率损耗系数先增大后减小;而当断面积为S=1200mm2时,随宽厚比b/a的增大,功率损耗系数减小且减小趋势逐渐变缓.当扁排厚度为a=10mm,断面积S为800~1200mm2时,交流功率损耗随窄边和宽边的铜层厚度比(δh/δw=0.5~3.0)增加而减小;铜层厚度之比对功率损耗的影响随包覆层面积比(SA=15%~45%)的增加而增大.在单位长度直流电阻和载流量与铜扁排相等时,选择合适的扁排断面形状结构,铜包铝扁排可较为明显地降低功率损耗.
Abstract:
A numerical calculate model of alternating current(AC) power loss of clad materials with a rectangle section was presented.The effects of sectional form and configuration on the AC power loss of copper cladding aluminum(CCA) conductive flat bars were analyzed.The results indicate that when the sectional area of the bar is 600 mm2,the power loss coefficient increases with the width-to-thickness ratio of the bar increasing;when the area is 800 mm2 or 1 000 mm2,the coefficient increases firstly then decreases;and when the area is 1 200 mm2,the coefficient decreases and the tendency becomes weak with the width-to-thickness ratio increasing.As the thickness of the bar is 10 mm and the sectional area of the bar is in the range of 800 to 1 200 mm2,the AC power loss decreases with the rate of copper thickness of the bar's narrow side to broadside increasing in the range of 0.5 to 3.0.The effect of the rate of clad thickness on the AC power loss strengthens as the rate of the copper layer's area to the whole sectional area of the copper cladding aluminum bar increases in the range of 15% to 45%.When the direct current resistance per unit length and current capacity are the same as a copper flat bar's,the AC power loss of the copper cladding aluminum bar is less than that of the copper bar by adjusting the sectional form and configuration.
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