高海拔地区线路调爬对变电站的绝缘配合影响

随着海拔的升高,绝缘子放电电压随之下降,为了弥补绝缘子放电电压下降引起的线路绝缘水平下降,一般采取增大线路绝缘子爬距的措施,但是变电站和输变电设备的绝缘水平无法调整.针对此种情况,以木里500 kV GIS 变电站及其500 kV出线为例,建立了基于ATP程序的仿真计算模型,同时根据DL/T620-1997提供的公式对...

Influence of Creepage Distance Adjustment of Transmission Line on Insulation Coordination of Substation in High Elevation Area

As the altitude increases,the discharge voltage of insulators declines.Generally,the measures of increasing the creepage distance are adopted to make up the decrease of line insulation level which results from the discharge voltage drop of insulators.However,the insulation level of substation and transmission and distribution equipment cannot be adjusted.So,taking 500 kV Muli GIS Substation and its transmission line for example,the simulation calculation model based on ATP is established,and the altitude correction for discharge voltage of insulators is carried out according to the formula in the DL/T 620-1997.The overvoltage and overcurrent generated in the electrical apparatus of the substation are calculated and the effect of lightning intruding surge on the insulation coordination of the substation is analyzed after adjusting the creepage distance.The research shows that there is no threat to insulation coordination if the number of insulators is added to 31 at No.1 tower and to 40 at other towers.