架空导线动态增容的热路法暂态模型

建立了架空导线动态增容的暂态热路模型,通过监测导线温度及导线周围环境温度便可实时计算出架空导线的允许载流量。设计了室内导线加载阶跃电流的实验,结果表明导线温度的理论计算值大于实测值,最大误差小于1℃,温升时间与环境热阻有关。设计了室外导线加载恒定电流24h的实验,通过暂态热路模型计算出导线实时最大允许电流,并初步分析了环境条件与导线温度的关系。

A Transient Model for Overhead Transmission Line Dynamic Rating Based on Thermal Circuit Method

The transient model for overhead transmission line dynamic rating based on the thermal circuit method is proposed.The ampere-capacity of overhead lines realizes real-time calculation based on the temperature of overhead line and environment.An experiment with the step current loaded is designed,the results show that the theoretical values are bigger than the experimental data,and the maximum error is less than 1 ℃.The time of temperature rise is related to the thermal resistance.Another experiment with the constant current loaded 24 hours is designed for proving the feasibility of dynamic rating on overhead lines outdoors.The maximum allowed current of real-time is calculated by the transient model of the thermal circuit method.The relationship between line temperature and environment conditions is analyzed.