中文摘要电力系统发生故障时，一次侧电流迅速增大，且含有一定的直流衰减分量。在这种情况下，电流互感器铁心可能会发生饱和。电流互感器铁心饱和后，二次侧电流将不能准确传变一次侧电流的信息，严重威胁电力系统的安全和稳定。本论文就电流互感器铁心饱和的特性及影响因素进行了深入的分析和探究。本文首先分析了电流互感器的数学模型及其铁心饱和的磁化特性；然后从理论上推测出可能影响电流互感器饱和的因素；接着对PSCAD仿真平台上基于Jiles-Atherton的电流互感器模型和基于Lucas的电流互感器模型进行了分析与比较；最后在PSCAD仿真平台上利用基于Lucas的电流互感器模型验证了各项因素对电流互感器饱和的具体影响。通过本文的理论和仿真分析可以得到，影响电流互感器饱和的因素主要有：一次侧电流的波形、二次侧负载、铁心剩磁、铁心截面积、绕组匝数和绕组变比。84123

毕业论文关键词  电流互感器；饱和；影响因素；PSCAD

毕业设计说明书外文摘要

Title    Research in the Impacting Factors of Current   Transformer Saturation                         

Abstract When the power system’s faults occurs, the primary side’s current increases rapidly and contains a certain DC decay component。 In this case, the current transformer core may saturate。 When the current transformer is saturated, the secondary side current cannot pass variable primary side information accurately。 It can cause a serious threat to the security and stability of power system。This paper does some deep research and analysis on the characteristics and influence factors of current transformer saturation。 Firstly, this paper analyzes the mathematical model and its saturation magnetization characteristic core current transformer。 Secondly, it theoretically infers factors that may affect current transformer saturation。 Thirdly,the current models on PSCAD simulation platform that are based on Jiles - Atherton and Lucas are analyzed and compared。 Finally,it verifies the various factors on the specific impact of current transformer saturation, using the current model based on Lucas on PSCAD simulation platform。 Through the theoretical analysis and simulation of this paper, it can be obtained that current transformer saturation factors are: primary-side current waveform, the secondary-side load, remanence core, core cross-sectional area of winding turns and winding turns ratio。

Keywords  current transformer, saturation, influence factors, PSCAD

目   次

1  绪论 1

1。1  课题的背景与意义 1

1。2  国内外研究现状 1

1。3  论文的主要工作 2

2  电流互感器铁心饱和特性分析 3

2。1  电流互感器的基本概念 3

2。2  电流互感器的等值电路 3

2。3  电流互感器的饱和特性 4

2。4  本章小结 5

3  电流互感器饱和的影响因素分析 6

3。1  一次侧短路电流的波形对饱和的影响 6

3。2  二次负载对饱和的影响 7

3。3  铁心剩磁对饱和的影响 7

3。4  铁心截面积对饱和的影响