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近年来,小水电站中250kW及以下机组采用可控硅励磁装置已经越来越普遍了。可控硅励磁因其优点突出,颇受人们的欢迎,它满足一般运行技术的要求外,还具有明显的优点,如电压调节性能好、电压增长速度快、反应时间短、较容易调节机组的无功出力,而且控制、操作简便。因其没有整流子设备,也不存在磨损及环火问题。 但据统计,我市近百台250kW及以下采用交流操作系统的机组,往往在运行的停机过程中,发生励磁可控硅元件烧损现象,严重地影响安全生产,带来了较大的经济损失。如恩平县就有10多台机组在运行中不断
In recent years, it has become more and more common that the 250kW and below units of small hydropower stations adopt SCR excitation devices. Due to its prominent advantages, SCR is well received by the people. It meets the requirements of general operation technology and has obvious advantages such as good voltage regulation, fast voltage growth, short reaction time and easy adjustment of the unit Reactive power output, but also control, easy to operate. Because there is no commutator device, there is no wear and ring fire problems. However, according to statistics, nearly 100 units in our city with exchange operating system of 250kW and below often suffer burning phenomenon of excitation thyristor components during the shutdown of the operation, seriously affecting the safety in production and bringing a large economy loss. Enping County, there are more than 10 units in operation continuously