GIL-架空线混合输电线路故障特性研究

气体绝缘金属封闭输电线路(GIL)具有输电容量大、占地少、维护量小、环境影响小等显著优点,逐渐成为特殊环境下替代架空线路的首选。针对某两回并行500 k V架空线路部分改造为GIL的混合输电线路系统,根据GIL和架空线的结构和电气参数,在PSCAD中建立GIL-架空线混合输电线路模型,并在线路不同位置设置短路故障进行仿真计算,研究其故障相电压和电流特性与改造前的差异,结合仿真结果提出线路改造建议。

Study on Fault Characteristics of Hybrid Transmission Line with GIL and Overhead Line

Gas-insulated transmission line (GIL) has many advantages, such as large transmission capacity, small occupation of land, small maintenance and small environmental impact, and has gradually become the first choice to replace overhead lines in special environments. Aiming at a hybrid transmission line system with two 500 kV overhead lines partially reformed to GIL, a GIL-overhead line hybrid transmission line model is established in PSCAD based on the structure and electrical parameters of GIL and overhead line, and short-circuit faults are set up at different positions of the line for simulation, so as to study the differences between fault characteristics. And suggestions for line reconstruction are proposed based on the simulation results.