可控硅的使用方面（The use of SCR）.docVIP

可控硅的使用方面（The use of SCR） In the fault line selection and compensation device of small current neutral grounding system The inductance of the arc ring can be made according to the size of the grounding capacitor current The phase of the arc suppression coil current and the grounding capacitance current And so on, in the opposite direction to achieve the best compensation effect. Arc suppression coil, arc suppression The adjustment of the sense is to control the iron by adjusting the current of the core exciting coil Saturation of the heart. This process relies on regulating the conduction angle of silicon controlled rectifier Present. The principle diagram of the arc suppression coil control system is shown in figure 1. Fig. 1 Schematic diagram of arc suppression coil control system Singlechip 8031 IN T1 interrupt to receive synchronization signal, P1. 0 Control trigger pulse. The voltage of the excitation coil is simultaneously used as the synchronous voltage Signal, when the control angle of the thyristor changes, the excitation coil and so on The exciting current also varies, so that the arc suppression coil is adjusted Purpose of induction. 1 hardware circuit 1.1 synchronization pulse acquisition method In AC equipment, the positive half and half weeks are controlled More than one, which requires the occurrence of two synchronous pulses in one cycle Chong. Therefore, the synchronization pulse is obtained by synchronizing the AC signals The waveform that causes the following zero crossing waveform to cross the previous zero crossing Consistent, as shown in figure 2. So, as long as there is a threshold voltage of 0 U, will U 1 and U subtraction, in the use of op amp circuit shaping, you can get synchronous pulse Chong. The factors that affect the synchronization pulse width are the amplitudes of U 1 and U 0. When A received date: 2000212218 About the author: Chen Xiaoying (19662), female, Liaoning Beipiao, Liaoning University of Technology lecturer. ? 1995-2006, Ts