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首页> 外文期刊>Power Engineering Review, IEEE >Real-Time Ampacity Model for Overhead Lines
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Real-Time Ampacity Model for Overhead Lines

机译：架空线的实时载流量模型

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摘要

A thermal model is formulated that has the capability of predicting the temperature of overhead transmission lines. The thermal model is formulated into a computer program that can calculate both steady-state and transient temperatures of a conductor. The transient portion of the program allows the simulation of ``real-time'' line operation and provides a method to predict instantaneous conductor temperatures. In addition to predicting the temperature and the ultimate sag of the line, the program can be used to predict the operating conditions of lines in the design stage. The program is also useful for designing new transmission spans and for predicting contingency ratings during emergency conditions. The model includes energy generated in the conductor, incident solar energy, emitted radiant energy, convection from the surface of the conductor, and energy stored within the conductor. Both free and forced convection modes are considered. The radiation model includes contributions due to direct and diffuse solar energy. The resulting differential equation for the conductor temperature is solved by the computer using a numerical technique. The program is capable of predicting the real-time line temperature for all conductor designs and any variation in weather conditions and line current. Coupled with a sag program, this type of information will permit the determination of instantaneous ground clearances of overhead conductors. Results are presented for the time constant of several conductors subject to step changes in current. The influence of weather conditions on conductor temperature are examined.
机译：制定了具有预测架空传输线温度的能力的热模型。热模型被公式化为计算机程序，该程序可以计算导体的稳态温度和瞬态温度。该程序的过渡部分允许模拟``实时''线路运行，并提供了一种预测导体瞬时温度的方法。除了预测管线的温度和最终下垂之外，该程序还可用于预测设计阶段管线的运行状况。该程序对于设计新的变速箱跨度和预测紧急情况下的应急等级也很有用。该模型包括导体中产生的能量，入射太阳能，发射的辐射能，导体表面的对流以及存储在导体中的能量。自由和强制对流模式都被考虑。辐射模型包括直接和散布太阳能的贡献。所得的导体温度微分方程由计算机使用数值技术求解。该程序能够预测所有导体设计的实时线路温度以及天气状况和线路电流的任何变化。结合下垂程序，此类信息将允许确定架空导线的瞬时离地间隙。给出了受电流阶跃变化影响的几种导体的时间常数的结果。研究了天气条件对导体温度的影响。

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