每芯导体电阻值测定结果的不确定度评定

Uncertainty Evaluation on Testing Results of Each Core Conductor Direct Current Resistance

摘要: 依据GB/T 3048.4-2007《电线电缆电性能试验方法第4部分导体直流电阻试验》, 采用双臂电桥法对某标称截面为2.5 mm2的单芯铜电线20 ℃时每千米长度的电阻值进行了测定, 并对试验过程中影响测定结果的各不确定度分量进行了评定。结果表明: 该单芯铜电线20 ℃时每千米长度的电阻值为R20=(7.837±0.023) Ω·km-1,k95=1.96。

Abstract: According to GB/T 3048.4-2007 “Test Methods for Electrical Properties of Electric Cables and Wires-Part 4: Test of DC Resistance of Conductors”, the DC resistance value per kilometre at 20 ℃of a 2.5 mm2 single core copper wire was measured by using arm bridge method. And uncertainty components which might affect the measurement results were evaluated. The results show that the DC resistance value per kilometre at 20 ℃ of the single core copper wire was R20= (7.837±0.023) Ω·km-1, k95=1.96.