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鉴于S注入法在高阻接地时易于受到分布电容的影响,提出对基于S注入法的信号发生装置的研究,介绍了信号源的硬件结构和软件设计。硬件控制部分采用了单片机控制脉冲调制,分析了脉冲宽度调制(PWM)控制技术在该装置中的应用;软件设计根据所需的注入信号与PWM波的关系,通过软件编程得到PWM信号。高频的PWM信号激励逆变电源中2个开关管,输出端通过滤波得到具有很高稳定性的注入信号,产生频率恒定、电压可调的交流信号,使得信号探测器很容易探测到该信号。该信号源装置降低了高阻接地探测的难度,使故障定位的精度和可靠性都得到大幅提高。
In view of the fact that the S injection method is apt to be affected by the distributed capacitance during high resistance grounding, a research on the signal generation device based on S injection method is presented. The hardware structure and software design of the signal source are introduced. The hardware control part adopts SCM pulse modulation to analyze the application of pulse width modulation (PWM) control technology in the device. The software design gets the PWM signal through software programming according to the required injection signal and PWM wave. The high-frequency PWM signal excites two switching tubes in the inverter, and the output end obtains a high-stability injection signal through filtering to generate a constant-frequency and adjustable AC signal so that the signal detector can easily detect the signal . The signal source device reduces the difficulty of high-impedance ground detection, so that the accuracy and reliability of fault location are greatly improved.