Most of the present studies of overvoltage characteristics of half-wavelength transmission lines focus on the natural half wavelength or less than half wavelength(3 000 km)of the line transmission length,and the adaptability is not enough.In order to deal with the problem that the transmission length of actual half-wavelength transmission line may exceed half wavelength,two meth-ods of compensating lines are proposed,which are divided into π-type and T-type compensation forms in structure.The simulation model is built in PSCAD/EMTDC software to analyze the overvoltage characteristics of the line under different working conditions.The simulation test results show that the π-type and T-type compensation networks can make the lines that exceed half wavelength have half-wavelength transmission characteristics.In the case of single-phase and three-phase grounding faults,the overvoltage value along the line is comparatively large,so it is necessary to take suppression measures.
关键词
半波长输电线路/过电压/线路补偿/仿真试验
Key words
half-wavelength transmission line/overvoltage/line compensation/simulation test
维普
万方数据