CAJ | 학술논문

架空导线允许载流量是线路安全运行的重要参数,深入分析了稳态载流量及暂态载流量的计算原理.由于导线自身热容的缘故,外界条件(环境条件或者加载电流)发生跃变时,导线温度处于暂态过程.以热电比拟为基础,通过监测导线温度及环境温度建立了架空导线暂态热路模型,得出了导线暂态允许电流-允许时间-允许温升数学模型.根据暂态热路模型可以实现暂态允许电流的实时计算,为确保线路出现N-1故障或者短时过负荷时的正常运行提供方便,并提出了预先调度的概念.最后,对暂态载流量计算模型进行了试验验证,试验结果与理论计算基本一致,且理论计算允许时间偏于保守.
가공도선윤허재류량시선로안전운행적중요삼수,심입분석료은태재류량급잠태재류량적계산원리.유우도선자신열용적연고,외계조건(배경조건혹자가재전류)발생약변시,도선온도처우잠태과정.이열전비의위기출,통과감측도선온도급배경온도건립료가공도선잠태열로모형,득출료도선잠태윤허전류-윤허시간-윤허온승수학모형.근거잠태열로모형가이실현잠태윤허전류적실시계산,위학보선로출현N-1고장혹자단시과부하시적정상운행제공방편,병제출료예선조도적개념.최후,대잠태재류량계산모형진행료시험험증,시험결과여이론계산기본일치,차이론계산윤허시간편우보수.
The allowed current of overhead lines is an important parameter to safe operation of lines. The calculation principle of steady ampacity and transient ampacity were analyzed deeply. When the external conditions (environmental condition or load current) changed, the temperature of overhead lines was in transient state because of the heat capacity of conductors. The transient thermal circuit model of overhead lines was built by monitoring the conductor temperature and environmental temperature based on thermoelectrical analogy, and the mathematical model of transient allowed current-allowed time-allowed rising temperature was obtained. The transient allowed current can be calculated timely based on the transient thermal circuit mode, which was able to provide help for the normal operation of overhead lines when the lines appeared N-1 fault or short time overload. The transient allowed currents were compared under different initial temperatures of overhead lines, and the concept of pre-schedule was proposed. Finally, the calculation model of transient allowed current was proved by experiment, the experimental result was consistent with the theory calculated value, and the theory calculated value was conservative.