基本任务及要求：
   本课题要求设计一台可用于交流50Hz、电压380V以下，作为电力系统中的过电流保护元件的过电流瞬时动作的继电器，它主要由交流电磁系统、触头等部分组成，要求根据技术条件要求完成电磁系统和触头系统的初步设计，并用PRO/E等软件辅助完成实体造型设计，用有限元法、ANSYS软件对电磁系统进行电磁场分析，并结合吸力与反力配合关系进行优化设计。                                                       
技术指标：
1、工作制为长期工作制；                                                              
2、安装地点的海拔不超过2000m；周围空气温度上限不高于＋40℃，下限不低于—5℃；        
3、继电器的触头约定发热电流为5A；继电器的触头数量为2对，触头组合形式为一常开一常闭；
4、继电器的吸引线圈的额定工作电流为2.5A；电磁铁结构形式为拍合式。                    

电流继电器设计

摘  要：在现代电力系统中，继电保护装置是保证电力系统安全运行和提高电能质量的
重要工具，而且，电力系统的规模在不断扩大，用户对电能质量的要求也在不断提高。因此，对继电保护装置本身的要求也越来越高。电流继电器是反映电路电流变化而动作的电器。它用于电动机或其他负载的过载及短路保护、直流电机磁场控制或失磁保护等。电流继电器根据用途不同可分为过电流继电器,欠电流继电器。本文讨论的是电流继电器的设计。根据技术要求，对继电器的电磁铁、气隙磁场的分布、各参数的合理选择，触头系统等多方面的情况进行了研究，并结合PRO/E进行辅助设计,用ANSYS软件进行有限元分析,从而确定了有效的实施方案。
关键词：继电保护；电流继电器；电磁系统；触头系统；有限元分析

The Design of A Current Relay

Abstract：Protection relay is the most important tool to make thepower system work safely and improves the quality of powerenergy.With the expansion of the power system and the consumerraising higher requirement for quality of power energy,theprotection r elay must be improved greatly and fulfill the highrequirement. Electric current relay reflect circuit electriccurrent changes but electric apparatus of movements. It used inmotor or other overload of load and short out protection, directcurrent machine magnetic field control or lose magnetism not toprotect etc.Electric current relay with can is it for pass electriccurrent relay , owe electric current relay to divide according touse. In this paper, the method of design for currrrent relay isdiscussed. By the request of technologies, the electromagneticsystem , airgap flux distribution and parameters of relay areresearched，and combining the Pro/e proceeding the assistancedesigns, proceeding the limited dollar analysis with ANSYS. Aneffective method of design is implemented, according to the resultof research..
Keywords: power system protection; current relay; electromagneticsystem; spring system; thermal analysis

目   录
摘要..............................................................................I
Abstract ........................................................................II
第1章 绪论.......................................................................1
1.1继电器发展史..................................................................1
1.2电流继电器简介................................................................3
第2章 电磁系统的设计.............................................................4
2.1概述..........................................................................4
2.2电磁系统的基本特性............................................................6
   2.2.1吸力特性.................................................................6
   2.2.2反力特性.................................................................6
   2.2.3时间特性.................................................................6
2.3电磁系统结构形式的选择........................................................7
   2.3.1从吸力与反力特性配合来选择电磁铁的结构形式...............................7
2.3.2用结构因素选择电磁铁的结构形式..............................................8
2.4电磁系统的设计要点............................................................9
2.5气隙磁导的计算...............................................................10
   2.5.1数学分析法..............................................................10
2.5.2分割磁场法.................................................................10
2.6交流磁路及吸力计算...........................................................11
2.6.1交流磁路计算...............................................................11
2.6.2交流电磁吸力计算...........................................................13
2.7交流电磁系统的设计...........................................................14
    2.7.1初步设计的基本关系式...................................................14
    2.7.2初步设计的步骤.........................................................16
2.8分磁环设计....................................................................21
第3章 触头系统..................................................................23
3.1概述.........................................................................23
3.1.1电接触的概念...............................................................23
3.1.2对触头的基本要求...........................................................24
3.1.3触头的种类.................................................................25
3.1.4触头结构形式的选择.........................................................25
3.2接触电阻.....................................................................26
3.2.1接触电阻的形成.............................................................26
3.2.2接触电阻的计算公式.........................................................27
3.2.3影响接触电阻的因素.........................................................27
3.3触头材料的选用要点...........................................................28
3.3.1对触头材料的要求...........................................................28
3.3.2常用的触头材料.............................................................30
3.4触头温升及其计算.............................................................31
3.4.1触头稳定温升...............................................................31
3.4.2触头的允许温升.............................................................31
3.4.3触头稳定温升的计算公式.....................................................31
3.5触头的振动及其计算...........................................................32
3.5.1触头的振动.................................................................32
3.5.2触头振动的计算公式.........................................................32
3.6触头磨损及其计算.............................................................33
3.6.1触头磨损的形式.............................................................33
3.6.2电磨损及其计算.............................................................34
3.7触头主要参数的选择和确定.....................................................35
3.7.1触头开距的选择.............................................................35
3.7.2触头超程的选择.............................................................35
3.7.3触头的初压力和终压力的确定.................................................36
3.7.4触头尺寸及材料的选择.......................................................37
第4章 PRO/E辅助设计.............................................................38
4.1PRO/E简介....................................................................38
4.2PRO/E设计....................................................................38
第5章 ANSYS分析.................................................................41
5.1概述.........................................................................41
5.2ANSYS分析的基本概念与步骤....................................................42
结束语...........................................................................45
参考文献.........................................................................46
致谢.............................................................................47
附图 JL15电流继电器.............................................................48

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