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水电站中应安装反映机组转速的信号装置,以满足机组运行中投切电液调速器,起励装置、自同期并列、机组制动、调速器失灵保护及防机组飞逸保护等控制系统的需要.对于小水电站,虽不需如此完善的功能和保护,但机组自动制动和过速保护则是必需的.当前,在部分小水电站中,由于机组未配置永磁机,所以不能安装电磁型转速信号装置.由于机组轴上未留安装位置,故不能安装机械型和电气脉冲型转速信号装置.BZX-3型残压式转速信号装置由于价格太贵,一般小水电站均未安装.所以在转速信号与过速保护方面留下缺口.使得机组无法自动地实现35%n_e时的刹车制动.更严重的是无法有效地防止
Hydropower station should be installed to reflect the unit speed of the signal device to meet the unit operation switch cast electro-hydraulic governor, starting device, parallel from the same period, the unit brake, governor failure protection and anti-unit escape protection control system Of the need for small hydropower stations, although not so perfect function and protection, but the unit automatic braking and over-speed protection is required.At present, in some small hydropower stations, because the unit is not configured permanent magnet machine, it can not be installed Electromagnetic speed signal device.Because there is no installation position on the shaft, it can not be installed mechanical and electrical pulse type speed signal device.BZX-3 type residual pressure type speed signal device is too expensive, generally small hydropower stations are not installed. So a gap is left between the speed signal and the overspeed protection, making the unit unable to automatically achieve a braking brake at 35% n_e, and even more serious is the inability to effectively prevent