基于迭代算法的220kV麒天甲乙线单芯电缆载流量分析

鉴于IEC 60287系列标准中的电缆载流量计算方法(以下简称IEC 60287算法)较保守和精确度不高,提出采用精确度和适用范围均比IEC 60287算法优越的迭代算法进行电缆载流量计算.利用广东电网公司重点科技项目——电缆载流量研究的土壤温度推荐值,以迭代算法对220 kV麒天甲乙线进行全路径电缆载流量分析,对所有...

Analysis on Ampacity of Single-core Cable of Line A and B of 220 kV Qi-Tian Line Based on Iterative Algorithm

Aiming at conservativeness and inaccuracy in ampacity calculation by IEC 60287(hereinafter referred to as IEC 60287 algorithm),the paper suggests adopting iterative algorithm which is superior in accuracy and scope of application to IEC 60287 algorithm.By technology program of Guangdong Power Grid Corporation-recommended value of soil temperature for ampacity research,ampacity of the cables of line A and B of 220 kV Qi-Tian line is analyzed via iterative algorithm and cable sections with ampacity bottleneck are evaluated in particular and calculated.The conclusion is that ampacity of line A and B of 220 kV Qi-tian line in two-circuit operation is 1 071 A,and 1 298 A in single-circuit operation,which is respectively 102 A and 118 A higher than that by IEC 60287 algorithm.Thus iterative algorithm is more practical.In order to avoid bottleneck in transmission of new lines,the paper suggests keeping certain margin,controlling temperature at ampacity bottleneck and building accurate basis information of cables and superior laying mode of tunnels.