【作者】 王晓宇；

【导师】 张振华；

【作者基本信息】 华北电力大学（北京） ， 电力系统及其自动化， 2003， 硕士

【摘要】 随着电力系统的迅速发展,电网结构不断发生变化。同杆并架双回线路和远距离重负荷线路将不断增多，分支线路和多端线路亦将增加。在我国高压线路保护中有着丰富运行经验的高频相差保护、高频方向保护和距离保护等,很难满足这些新情况对保护的要求。此课题主要是研究能够更好适应电网发展的新型电流纵差保护。其主要内容是：（1）对影响差动保护灵敏度的各种因素和不同的电流差动保护判据进行了理论分析；（2）用EMTP仿真软件对差动判据进行了数据仿真，并用Matlab对输出结果进行了详细的可视化分析；（3）分析、比较了国内外纵差保护的数据采样同步方法；（4）对判据进行了实际的编程实现和动模仿真。此装置的优点是：能够灵敏、可靠的切除电力系统发生的各种故障，尤其是基于故障分量的差动判据与传统差动判据相比，在重载线路上发生各种故障，即使是高阻接地时，也具有很好的灵敏性。更多还原

【Abstract】 With the rapid development of the power system, the power grid changes day to day, such as: the number of parallel lines increases greatly, the transmission lines become much longer and the load is much more heavy. Furthermore, T lines and the multi-terminal lines are commonly used. The traditional protections, including the Phase Differential Protection Based on High Frequency, the Directional Protection Based on High Frequency and the Distance Protection cannot meet the demand of these developments.The thesis is focus on the research of the optical-fiber differential current protection that can adapt to the rapidly changing power grid. It mainly contains the following four parts: (1) Theoretical analysis of some operation criterions and some factors that influence the operation of the differential protection. (2) Simulation of a 500kv transmission line using EMTP software. The results were visually analyzed through Matlab software at length. (3) Analysis and comparison of some synchronization methods used by domestic and abroad companies. (4) Programming the software of the protection devices and having dynamical tested the devices.The devices have many merits. They can sensitively and reliably cut off all the faults occurring in the power system. Even under the critical situation, faulting on the long heavy load transmission lines through high ground resistances, the criterion based on fault components still has considerable sensibility. Wang Xiaoyu (Power System & It’s Automation)更多还原