110kV冯家变电站变压器保护的研究

发布时间：2018-02-11 01:44

本文关键词： 变压器保护定值计算保护调试电力系统　出处：《中国海洋大学》2014年硕士论文　论文类型：学位论文

【摘要】：在电力系统中，变电站是电力系统中的重要组成元素。而在变电站中，变压器又是这个元素中的核心单元，所以变压器能否正常、稳定运行直接关系到整个电力系统的稳定。目前随着社会用电量的不断增加，变压器的容量也随之不断增大，为了保证变压器的正常稳定运行，，我们对变压器保护有了更高的要求。变压器保护是保护电力变压器安全和防止电力系统长时间大面积停电的最基本、最重要、最有效的技术手段。许多实例表明，变压器保护装置一旦不能正确动作，就会扩大事故，酿成严重后果。因此，加强变压器的保护设计、定值整定和保护调试，是保证变压器本体安全以及电网安全的重要工作。本文就以110kV冯家变电站为例，来研究一个常规降压变电站变压器保护。本课题的研究内容是设计一个常规110kV降压变电站变压器保护系统。系统包括以下几部分：作为变压器主保护的变压器非电量保护和差动保护的设计、整定和调试，以及作为变压器后备保护的变压器过流、接地保护的设计、整定和调试。其中作为变压器主保护的差动保护是本文研究的重点内容。差动保护由差动速断保护和比率差动保护组成，主要反应变压器内部、外部故障，作为变压器的电气量主保护，其性能直接决定变压器保护的性能。差动保护的章节中首先对现有的变压器差动保护基本原理和动作原理做了简单介绍，其次重点分析了正常状态下产生不平衡电流的原因以及消除正常不平衡电流的办法，最后详细讲解了变压器差动保护定值的整定规则和差动保护的调试方法。
[Abstract]:In power system, substation is an important element in power system. In substation, transformer is the core unit of this element, so whether the transformer is normal or not, The stable operation is directly related to the stability of the whole power system. At present, with the increasing of the power consumption, the capacity of the transformer is also increasing. In order to ensure the normal and stable operation of the transformer, We have higher requirements for transformer protection. Transformer protection is the most basic, important and effective technical means to protect power transformer safety and prevent power system from power system power outages for a long time. Many examples show that once transformer protection device can not be operated correctly, Therefore, it is important to strengthen transformer protection design, value setting and protection debugging to ensure transformer body safety and power network safety. This paper takes 110 kV Fengjia substation as an example. To study the transformer protection of a conventional substation. The research content of this subject is to design a conventional 110 kV transformer protection system in step-down substation. The system includes the following parts: the design, setting and debugging of transformer non-electric protection and differential protection as main protection of transformer, As well as the design of transformer overcurrent and earthing protection as transformer backup protection, The differential protection, which is used as the main protection of transformer, is the main content of this paper. The differential protection is composed of differential protection and ratio differential protection, which mainly reflects the internal and external faults of transformer. As the main electrical protection of transformer, its performance directly determines the performance of transformer protection. In the chapter of differential protection, the basic principle and operation principle of transformer differential protection are introduced briefly. Secondly, the causes of unbalance current under normal condition and the method to eliminate the unbalance current are analyzed. Finally, the setting rules of transformer differential protection and the debugging method of differential protection are explained in detail.
【学位授予单位】：中国海洋大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM63;TM774

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