能源工程

直埋电缆在光伏电站中常用作集电极线路汇集和输送电能，准确评估电缆载流量是光伏电站设计中电缆选型的依据。依据IEC 60287热路解析模型分析了土壤含水率、电缆埋深和土壤边界温度对YJLV22-26/35-3×400三芯电缆载流量的影响，并提出了载流量的近似估算公式。研究结果表明，土壤含水率降低、电缆埋深增加、土壤边界温度升高都会降低电缆载流量。基于研究结论，提出了改善电缆载流量的措施。

Direct-buried cables are often used as collection lines in photovoltaic power plants to collect and transport electrical energy. Accurate assessment of cable ampacity is the basis for cable selection in the design of photovoltaic power plants. This paper analyses the effects of soil moisture content, cable burial depth and soil boundary temperature on the YJLV22-26/35-3×400 threecore cable's ampacity according to the IEC 60287 thermal circuit analysis model, and proposes an approximate estimation formula for ampacity calculations. The study shows that reduced soil moisture content, increased cable burial depths and increased soil surface temperatures all decrease cable ampacity. Based on the conclusions of the study, measures to improve the ampacity of cables are proposed.