架空输电线路的暂态热平衡模拟

Transient Simulation of Transmission Line Based on Heat Balance

在有限元方法的基础上,根据输电线路的温升变化的过程,进行具体的分析,得出影响温升的变量,包括风速、风的偏向角度、导线的电流、周围温度、日光的作用等因素,都对输电线路从暂态到稳态的时间产生重要的影响;结果显示:风速对从变化时刻到达到稳态所需的时间起着至关重要的作用,能够使时间迅速的减少;随着风向角度的增加,达到稳态的时间迅速地减少,直到增大到60°后对时间的影响不大;暂态所需时间对载流量的变化比较敏感,当载流量发生变化时,达到稳态的时间存在巨大的变化;周围的温度以及日光的作用,对此影响几乎可以忽略。

Based on the finite element method to establish the model, we can analysize the safety time impacted by wind speed, direction angle, capacity, environmental temperature and sunshine intensity. With the increase of wind speed, it will sharply reduce the time to steady state. Since we give them the same change, the wind speed is smaller and the change is bigger; With the increase of wind angle, it needs less time to steady state. When the angle is more than 60 °, it almost has no influence on the time. If load flow changes, there is a huge change about the safety time. Environment temperature and sunshine intensity have little influence.