架空线路载流量的导线温度测量方法研究

Method of Measuring Conductor Temperature for Ampacity of Overhead Lines

架空输电线路动态载流量可以通过IEEE738-2006标准提供的公式进行计算,但在采用导线表面温度代替导线实际温度来计算导线载流量时会产生较大的误差。为了更准确地测量架空导线温度,通过对导线同一截面不同位置的温度深入研究,探究架空导线合适的测温方法。提出利用铝层包裹热电阻传感器探头的测温方法,解决导线表面温度与实际温度之间的差值问题。通过实验证明,测量值与导线真实温度误差在1.5℃以内。

The dynamic ampacity of overhead transmission lines can be calculated by the formula of IEEE 738-2006 standard. However,a larger error occurs as a result of using the surface temperature of wire instead of the actual wire temperature when calculating the ampacity. In order to measure the real temperature of overhead conductor, the paper explores a suitable temperature measurement through the further study about the temperature of different locations in the same section of the conductor. The method about using the aluminum layer to cover thermal resistance solves the problem about the differences between the surface temperature of wire and its actual temperature. The experimental results show that the error between the measured value and the real wire temperature is less than 1.5℃.