PR6423/008-110+CON041艾默生轴振传感器大型同步电机应用场合非常广泛,除了作为常规发电机组外,在电力系统中还用作抽水蓄能机组和同步调相机组,而抽水蓄能机组和同步调相机组在维持电网频率稳定和电压稳定方面具有重要作用。目前,以晶闸管为换流器件的高压大容量静止变频器是实现大型同步电机变频启动的最佳选择,由于晶闸管的额定电流大,其在大容量静止变频器中具有IGBT不能替代的作用。但晶闸管不能通过门极实现器件自关断,需要合适的换相方法使其关断。PR6423/008-110+CON041艾默生轴振传感器静止变频系统启动原理静止变频系统主要由主电路和控制系统两部分组成。
PR6423008-110+CON021
主电路包括输入变压器、输出变压器、断路器、隔离开关、晶闸管整流电路、电流型逆变电路、输出电容器组和同步电机:控制系统由高性能控制器、数据采集单元和晶闸管触发单元组成,负责完成包括数据采集、晶闸管变流电路触发和励磁系统控制等在内的任务。测量输入电压/电流和输出电压/电流需要经过电压互感器和电流互感器,将高压大电流信号转换为低压小电流信号,测量单元将低压小电流信号转换为数字信号,然后传递给控制器中的控制程序计算使用。
PR6423008-110+CON021
PR6423/008-110+CON041 Emerson shaft vibration sensor is widely used in large synchronous motors. In addition to being used as a conventional generator set, it is also used as a pumped storage unit and synchronous phase-shifting unit in the power system. Pumped storage units and synchronous phase-shifting units play an important role in maintaining grid frequency stability and voltage stability. At present, high-voltage and high-capacity static frequency converters using thyristors as converter devices are the best choice for achieving variable frequency starting of large synchronous motors. Due to the high rated current of thyristors, they have an irreplaceable role in high-capacity static frequency converters that IGBT cannot replace. However, thyristors cannot achieve device self shutdown through gates, and appropriate commutation methods are needed to turn them off. PR6423/008-110+CON041 Emerson shaft vibration sensor static frequency conversion system startup principle The static frequency conversion system mainly consists of two parts: the main circuit and the control system.
PR6423008-110+CON021
The main circuit includes input transformer, output transformer, circuit breaker, isolation switch, thyristor rectifier circuit, current type inverter circuit, output capacitor group, and synchronous motor. The control system consists of a high-performance controller, data acquisition unit, and thyristor trigger unit, responsible for completing tasks including data acquisition, thyristor converter circuit triggering, and excitation system control. The measurement of input voltage/current and output voltage/current requires passing through voltage transformers and current transformers to convert high voltage and high current signals into low voltage and low current signals. The measurement unit converts the low voltage and low current signals into digital signals, which are then transmitted to the control program in the controller for calculation and use.
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