The input AC voltage is obtained according to the excitation voltage demand value of the DC excitation motor. The TDGC2-1 autotransformer is used as the input power transformer of the excitation power supply line, so that it is easy to obtain the power supply voltage required by the circuit, and facilitate the installation and debugging operation of the circuit. The rectification method determines that the rectification circuit eliminates the complicated thyristor rectification circuit, and has a diode half-wave and a diode full-wave rectification circuit, and a diode bridge full-wave rectification circuit. Among these rectification circuits, the power utilization of the diode half-wave rectification circuit The rate is low and the pulsation is large. Although the power utilization rate of the diode full-wave rectification circuit is higher than that of the half-wave rectification circuit, the ripple is small, but the transformer is required to have a middle tap, and the circuit uses more components and more connection points. The circuit using the bridge stack rectification not only has a simple circuit, uses fewer components, has fewer connection points, has a small overall shape, high power utilization rate, and the output DC power supply has small pulsation and stability, and is suitable for the excitation power of the DC motor. Therefore, the bridge full-wave rectification circuit is applied as the excitation power source for the DC motor. The fault protection fault protection circuit consists of two fuses and a current transformer. The fuses are installed on the power supplies L1 and L2 respectively. The current transformers are installed after the fuses. When the load circuit is short-circuited, the fuses can be first. The time cuts off the power supply to form a protection, and the current transformer provides a current signal to the governor overload protection action and alarm. Insulated Copper Tube Terminals Insulated Copper Tube Terminals,High quality insulated terminal,copper tube terminal Taixing Longyi Terminals Co.,Ltd. , https://www.txlyterminals.com