【作者】 梁俊滔；

【导师】 孙鸣；

【作者基本信息】 合肥工业大学 ， 电气工程， 2002， 硕士

【摘要】 本文就现有的电力变压器主保护原理，特别是各种励磁涌流判据，进行了较深入的分析，指出了存在的问题，并提出了新的基于正序功率的变压器纵差保护原理。文中首先对电力变压器保护原理的现状和发展情况进行了介绍和总结。紧接着在对励磁涌流产生机理进行详细分析的基础上，提出了基于能量守恒定律的新的保护原理，并对其理论基础和可行性进行了充分的论证。最后分析了该保护原理的动作行为，并以数字仿真的方法加以验证。 研究结果表明，基于正序功率的变压器纵差保护原理相对于传统的电流纵差保护原理在励磁涌流判别方面有着很大的优势，而且在增加简单的辅助判据后，完全可以作为独立的变压器主保护使用。在提倡电气主设备主保护双重化的今天，有较高的理论研究价值和实际推广价值。更多还原

【Abstract】 Existing principles of transformers main protection, especially in criterions of magnetizing rush current, are analyzed deeply in this paper. The author points out questions in existence, and describes a new method based on the sum of positive sequence active power flowing into transformers from each terminal. Firstly, the developing foreground and actuality of power transformer main protection principle are summarized and introduced in detail. Secondly, on the basis of mechanism of the magnetizing rush current, the new protection principle based conversation of energy is pointed out, and its feasibility also is proved in detail. At last, to check the performance of this method, theoretic analysis and digital simulation are adopted.It is confirmed that compared with conventional current differential protection, positive sequence active power differential protection principle is being predominant in distinguishing magnetizing rush current from fault current. Moreover, after adding simple assistant criterions, it can be carried out as independence main protection. Today, it is advocated that two series different main protection principle of main electric equipment may be apply at simultaneity. So it’s worth popularizing.更多还原