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随着农村水电站的不断发展,不少农村电力网中有许多容量比较大的电网还直接与地方电网或国家大电网联结起来,提高了供电的可靠性。在大电网经过的地方,许多农村用户也往往直接从大电力系统中取得电源或补充小电网的不足,因此农村35千伏变电站一般有三种:(一)农电系统中,农村水电站本身供电采用35千伏的升压站或降压站;(二)大电网采用35千伏的降压站供电;(三)农电系统中,农村电站与大电网并列运行供电的升压站或降压站。在上述三种变电站中,对主变断路器的选择,通常是按正常运行条件进行选择的。但在
With the continuous development of rural hydropower stations, many rural power grids have many large-capacity grids that are directly connected with local power grids or national large power grids to improve the reliability of power supply. Where large power grids pass, many rural users also often lack power directly from large-scale power systems or supplement small power grids. Therefore, there are generally three types of 35-kV substations in rural areas: (1) In rural power system, rural hydropower stations themselves use power supply 35 kilovolt booster station or step-down station; (2) The large power grid uses 35 kilovolt step-down station to supply power; (3) In rural power system, rural power station and large power grid run side by side booster station or buck station. In the three substations, the main circuit breaker selection, usually under normal operating conditions to choose from. But in