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小水电站输电线路的过电流保护灵敏度低的问题,是当前普遍存在的问题.由于保护灵敏度不够,显著降低了电网的运行可靠性.本刊82.2期载文中提出的解决方法比较好,简单实用.但文中还存在有值得进一步研究的地方,例如当机组为4台时,当判断1～2台3～4台机投入,提出了图(3)的结线方式,用ZJ判断运行方式,其电源接在母线电压互感器的二次侧,其电源电压是100V,即前提是正常运行情况.但过流保护则应是在事故情况下起作用.我们知道小型水电站由于
The problem of low over-current protection sensitivity of transmission lines in small hydropower stations is a common problem at present because the protection sensitivity is not enough to significantly reduce the operational reliability of the power grids, and the solution proposed in the paper of Article 82.2 is relatively simple and practical. However, there are still some areas worthy of further study. For example, when the unit is 4 units, when it is judged that 1 ~ 2 units of 3 ~ 4 units are put into operation, the connection mode of Fig. 3 is put forward and the operation mode is judged by ZJ Power is connected to the secondary side of the bus voltage transformer, the power supply voltage is 100V, that is, the premise is normal operation, but over-current protection should be in the event of an accident. We know that small hydropower stations due to