【作者】 许光华；

【导师】 邵玉槐；

【作者基本信息】 太原理工大学 ， 电力系统及其自动化， 2003， 硕士

【摘要】 针对国内目前中、低压电网大都未装设母线保护装置，发生故障不能及时切除时造成很大损失的状况，本文在广泛研究当前主流的母线保护动作原理并认真分析了中、低压小电流接地系统特点的基础上，提出了一套适合中、低压微机母线保护装置的研制方案，并据此选择、搭建了硬件平台，设计了软件功能程序。 本文首先介绍了微机保护装置的一般硬件配置以及作为装置硬件平台的STD90386工控机各组件模板的功能，然后分析了目前电网系统装设的母线保护的各种类型以及中、低压小电流接地电网的特点，在此基础上分析、介绍了作为本保护动作原理的“比率制动式差动保护”原理。随后在研究母线保护运行时可能会遇到的各种问题中着重讨论了关于CT饱和对母线保护带来的负面影响以及解决对策。算法理论作为微机保护的软件核心也是本文的讨论重点，以保护的动作原理为基础，认真研究了采样瞬时值法与一般的矢量值法的效果比较，突出了采样瞬时值法时间窗短、动作准确的优点；而针对低电压闭锁所采用的三采样值积算法也正是出于时间窗较短，便于配合保护动作的考虑。论文的最后是关于提高装置性能措施的介绍，作为微机保护理论实际应用的重要环节，这是每个微机保护研究人员都必须认真考虑的。更多还原

【Abstract】 Nowadays ,busbarprotection is commonly uninstalled on MV or LV power system in our country. But when fault was occurred ,sometimes there would be great loss. For the reason, the paper put forward a microcomputer bus protection scheme suit for MV or LV power system with low current grounding based on the great researching about the working theory of current bus protections and the characteristic of MV OR LV system with low current grounding . Based on it, the paper has designed the platform of the hardware and the software programs.Firstly , the paper introduced the commonly hardware configure of microcomputer relaying and the function of every module of industry controlling computer STD90386 . Secondly ,the paper introduced several types busbarprotection which was commonly installed on electric power system and the characteristic of MV OR LV system with low current grounding .Based on it, the paper put forwards the theory of percentage-restraint differential relay .After that ,in the discussing every problems of the relaying working the paper put the emphasis on the negative effect of the CT saturation and countermeasure. As the kernel of software ,the algorithm is another emphasis of the paper’s works. Based on the principle of relaying working, after comparing the effect between the algorithm of instantaneous sampling and the algorithm of vector ,the virtue ofshort data windows and precision action was stood out. And the choice of algorithm with three sampling data was for the reason of short data windows. In the end of the paper is the discussing of how to improving the performance of device. As the important part of theory applying, every researcher of microcomputer relaying must think of it carefully.更多还原