特高压输电系统过电压、潜供电流和无功补偿

介绍了国内外特高压输电系统过电压、潜供电流及无功补偿的研究结果,认为我国特高压输电线路可不采用高速接地开关;近期可采用固定式高抗,不用可控高抗;尽量缩短暂态过电压持续时间;特高压系统中突显的特殊操作过电压,即接地过电压和切除短路故障分闸过电压;绕击是造成特高压线路跳闸的主要原因,尤其在山区应适当减小地线保护角。特高压变电所应适当增加MOA数量,以减小雷电侵入波过电压。

Over-voltage, Secondary Arc and Reactive Power Compensation in UHV AC Transmission System

The domestic and foreran research results of over-voltage, secondary arc and reactive power compensation in UHV ac system are presented. The results indicate that the both high speed grounding switch and the controlable UHV shunt reactor are not necessary to be used in UHV ac transmission line in China, the general fixed UHV shunt reactor can be used in recent time. The sustained TOV time should be reduced, attention should be paid to special switching over-voltage, grounding fault over-voltage and tripping over-voltage caused by short circuit faults clearing in UHV system. Shielding failure is the main reason to cause flashover of the UHV transmission line, so that the shielding angle of grounding wires should be reduced, especially in mountain area. The quantity of MOA installed in UHV substation should be increased to suppress the lightning invaded over-voltage.