架空输电线路允许载流量计算

Calculation of Allowable Carrying Capacity for Overhead Transmission Lines

架空输电线路允许载流量可以采用查表法、Morgan公式法和IEEE推荐公式法来计算,这些方法计算过程繁简程度不同,需要考虑的因素不同,结果也不同。结合实际线路参数和环境信息,给出了3种方法的详细计算过程,比较了各种计算方法的优劣和适用场合。对于线路长期运行稳态允许载流量推荐采用Morgan公式法;IEEE推荐公式法可以计算线路动态允许载流量,在紧急情况下能充分发挥导线的载流潜力。

The allowable current carrying capacity of overhead transmission lines can be calculated by use of the look-up table method,the Morgan formula method and the IEEE recommended formula method.The calculation results of these methods are different with different degree of complexity and different factors to be considered.Combining actual line parameters and environmental information,this paper presents the detailed calculation process of the three methods,and also compares the advantages and disadvantages of various calculation methods and applicable occasions.The Morgan formula method is recommended for the long-term steady-state allowable current-carrying capacity of the line;the IEEE recommended formula method can be used to calculate the dynamic allowable current-carrying capacity of the line,which can give full play to the current-carrying potential of the conductor in the case of emergency.