对于一般农村小型水电站,大多使用6.3±5%/0.4千伏或10±5%/0.4千伏变压器与电网并列运行,但是,当水电站的输出线路与变电站母线相联时,如输入电压低于变电站低压侧电压,则水电站往往出现无功出力偏低,甚至欠磁发电等情况。这样,不仅机组不安全,而且还会受到电网管理单位罚款。 For small hydropower stations in general, most of them use 6.3 ± 5% / 0.4 kV or 10 ± 5% / 0.4 kV transformers to run in parallel with the grid. However, when the output line of a hydropower station is connected to the substation busbar, if the input voltage is lower than Substation low-voltage side, the hydropower station often appear low reactive power output, or even under magnetic power generation and so on. In this way, not only the crew is not safe, but also subject to a fine grid management unit.