应用于外加诊断信号接地选线保护的注入信号发生器研究  

Research on Signal Generator for Single-phase Ground Fault Line Selection Protection Based on Additional Diagnosis Signal

作　　者：邵建军[1] 潘贞存[1] 丛伟[1] 

机构地区：[1]山东大学电气工程学院,山东济南250061

出　　处：《电力科学与工程》2009年第8期13-16,共4页Electric Power Science and Engineering

摘　　要：在小电流接地系统单相接地故障选线技术中,外加注入诊断信号法得到了广泛的应用。但注入信号易受到各种电磁干扰、热噪声和同频噪声的影响。为了提高注入信号的稳定度和抗干扰性,研究并开发了一种高性能的注入信号发生器:采用了高稳电源,引入了PWM控制技术,并对输出的信号进行编码。该信号发生装置具有稳定的输出和较强的带负荷能力,为较好完成单相接地故障自动选线和定位功能奠定了基础。Among the methods of single-phase ground fault line selection in system with non-effectively earthed neutral, the additional diagnosis signal method is applied widely. But the diagnosis signal is easily affected by electromagnetic interference, resistance noise and frequency noise. A new type of signal generator with perfect performance was studied and developed in this paper. High steady power source and PWM modulation technology were introduced in this signal generator, and the output signal was coded in order to deal with interferes. The generator has steady output and high on-load capability, which lays a strong foundation for single-phase ground fault line selection in system with non-effectively earthed neutral.

关 键 词：外加诊断信号法 信号发生器 PWM控制 故障选线 小电流接地 

分 类 号：TM774[电气工程—电力系统及自动化]