摘 要在当今社会，电力系统已经成为了我们生活中不可或缺的部分。而电力变 压器又是电力系统中重要的环节，其能否可靠稳定的工作直接会影响到电力系 统的运行稳定性。如果电力变压器发生故障，不但会影响整个电力系统，而且 使得经济亏损。在电力变压器的差动保护里，励磁涌流不能被及时有效的抑制 是导致电力变压器发生误动作的重要原因之一。因此，我们要找到能够抑制励 磁涌流的有效的、稳妥的措施，这对于变压器的正常运作有着极其重要的意义。69586

在查阅了各种相关的书籍资料的前提下，本文先介绍了电力变压器的励磁 涌流所产生的各种原因，然后分析了差动保护对励磁涌流造成的影响，继而又论 述了励磁涌流的处理方法以及抑制励磁涌流的一些措施 。

目前能够辨别励磁涌流的方法都允许励磁涌流的存在，但是励磁涌流的存在 不仅导致变压器动作误差，还会影响电力系统。根据这些，本文中提出了一种低 电压侧并联电容和选项合闸技术来共同抑制励磁涌流，通过仿真，得出的结论证 明了此方法可以有效的抑制励磁涌流的产生。

该论文有图 20 幅，表 0 个，参考文献 26 篇。

毕业论文关键词：差动保护 励磁涌流 并联电容 选项合闸

Transformer Excitation Inrush Current and Its Suppression Measures

Abstract

In today's society, the development of the society, the power system has become an indispensable part of our life. Power transformer is the most important role in power system, stable and reliable work directly affects the operation of the power system stability. If the power transformer failure will not only affect the whole electric power system, and makes the economic losses. In power transformer differential protection, can not be timely and effective inhibition of excitation inrush current of power transformer is one of the important reasons for wrong operation. Therefore, we

need to find can inhibit the excitation inrush current have solid and effective measures, the normal operation of the transformer has very important significance.

After checking all kinds of books materials under the premise of this article first introduces the power transformer excitation inrush current to produce a variety of reasons, and then analyses the influence of excitation inrush current differential protection, and then discusses the excitation inrush current processing method and some measures to suppress the excitation inrush current.

Able to distinguish between excitation inrush current method allows the possibility of excitation inrush current, but the existence of transformer excitation inrush current action not only results in an error, can also affect the power system. On this basis, this paper puts forward a kind of low voltage shunt capacitance inhibition excitation inrush current and switch technology, through the simulation, the conclusion proved that the method can effectively inhibit the generation of excitation inrush current.Over the years, the experts after study raises some new methods of inhibiting transformer excitation inrush current. According to the inhibition of the different methods of, can be roughly pided into two categories: From the transformer external suppression measures. External began from the transformer, through a series of measures to weaken the excitation inrush current. Feasible

methods are: the low voltage side of transformer parallel capacitor, option switch, etc.

Key words: the choice of the differential protection excitation inrush current shunt capacitance to shut down

目 录