本科毕业设计（论文）

题目 220kV变压器保护设计

学 院 : 电气工程与自动化学院 专业名称： 电气工程及其自动化 年级班级： 电气08-1班 学生姓名: 指导老师:

I

摘 要

变压器是电力系统的重要组成部分。它的正常与否直接关系到电力系统的安全和经济运行。本次设计是220kV变压器保护的初步设计，主要包括：变压器保护的配置；由变压器的原始数据，选择变压器微机保护的型号；变压器各种继电保护的原理与整定计算。

根据《继电保护及安全自动装置反事故措施要点实施细则》的规定，220kV变压器的保护应有两套保护。本设计选择了瓦斯保护和纵联差动保护作为变压器的主保护，以保护变压器油箱内发生故障和变压器内部和引出线套管的故障；选择复合电压启动的过电流保护作为变压器纵联差动保护的后备保护，以保护外部相间短路引起的变压器过电流；由于本设计要保护的变压器是处在中性点直接接地的电力系统中，所以采用零序过电流作为变压器接地的后备保护；在本次设计中，过负荷保护还作为变压器的后备保护。

关键词：变压器、变压器保护、微机保护、整定计算

II

Abstract

The transformer is an important part of the power system. The normal of it is directly related to the economic operation of the electric power system security. This is the preliminary design of 220kV transformer protection. This design include the configuration protection; the choice of microcomputer models of transformer protection according to the original data by transformer; all kinds of transformers relay principle protection and setting .

According to the regulation of the detailed rules for implementation of anti-accident measures points about relay protection and safety automatic device, 220 kV transformer protection should have two sets of protection. In order to protect the fault caused by transformer tank and inter of transformer and pipe sleeve outgoing line , I chose the gas protection and transformer longitudinal differential protection as the main protection of transformer. And I chose the protection of the compound voltage start over current protection as the backup protection of transformer protection , in order to protect the transformer of over current has caused by external short circuit between two phase . In this design, the one of transformer is in the power of system which the neutral point is directly connected with ground , so I also chose the zero sequence current protection as a backup protection. And I chose a load of transformer protection as the backup protection, too .

Keywords: transformer; transformer protection; microcomputer protection; setting calculation

III