典型架空导线的紧急暂态过载能力评估

Evaluation of Emergency Transient Overload Capability of Three Typical Overhead Conductors

充分发挥架空输电线路的暂态过载能力,可以为短时高峰及事故等紧急情况下的电力系统安全运行及调度操作争取处理时间。基于导线暂态热平衡方程,利用龙格-库塔数值分析方法,评估了导线温升、暂态允许过载电流、安全运行时间等暂态过载能力,并通过计算给出了3种典型导线允许过载电流和安全运行时间的对应关系。

Giving full play to the transient overload capacity of overhead transmission lines can gain processing time for the safe operation of the power system and dispatch operations in emergency situations such as short-term peaks and accidents.Based on the transient thermal balance equation of the conductor,this paper uses the Runge-Kutta numerical analysis method to evaluate the transient overload current capacity of the conductor,such as temperature rise,transient allowable overload current,and safe operating time.Finally,three typical allowable conductors are calculated.Correspondence between overload current and safe running time.