《架空输电线路荷载规范》新旧规范线条荷载计算的差异分析

线条荷载是输电线路工程设计中的一项关键荷载,新实施的DL/T 5551—2018《架空输电线路荷载规范》对线条风荷载的计算公式和参数取值进行了修订.通过该规范与旧规范中线条风荷载计算公式和参数设定的对比,判断了新规范实施后对线条荷载计算的定性影响.结合具体算例,从线条张力、线条弧垂、线条风荷载三个方面分析了相同设计条件...

Difference Analysis of Line Load Calculation Between Load Code for the Design of Overhead Transmission Line and Previous Codes

Line Load is a key Load in power transmission line engineering design,the calculation formulas of wind load on lines and the values of parameters were revised in Load Code for the Design of Overhead Transmission Line(DL/T 5551—2018)which was newly adopted.The calculation formulas of wind Load on lines and the setting of parameters were compared between the new and previous codes,the qualitative effect on line load calculation after the implementation of the new code was judged.Furthermore,combined with specific examples,the differences of calculation results between the new and previous codes under the same design conditions were analyzed from three aspects:line tension,line sag and line wind load.The results showed that the calculation results of new and previous codes were different under different control conditions of line tension.Line wind load of 220 kV voltage levels and below lines would increase greatly after the new codes were adopted,so attention should be paid to tower design.