基于李萨如图的变压器联结组别判定方法  

Judging method based on Lissajous figure of connection sets of the transformer

作　　者：于明星[1] 朱家正[2] 

机构地区：[1]朝阳师范高等专科学校,辽宁朝阳122000 [2]国网辽宁省电力有限公司葫芦岛供电公司,辽宁葫芦岛125001

出　　处：《辽宁师专学报（自然科学版）》2017年第1期6-9,共4页Journal of Liaoning Normal College(Natural Science Edition)

摘　　要：对联结组标号的正确判断是变压器并联运行及差动保护的前提。传统判定联结组别的方法耗时且判断过程易出错,提出一种通过李萨如图分析高压测和低压测线电压相位关系判断变压器联结组别的方法。首先,建立变压器高压绕组线电压和低压绕组线电压的李萨如数学模型关系式。然后,分别给出低压绕组为三角形接法和星型接法的增益模块外电路设计参数。最后,通过Matlab/Simulink软件对不同联结组别的变压器进行了仿真。仿真结果表明:组别标号和为12的李萨如图一致,联结组标号为奇数,图形为圆及椭圆;联结组标号为偶数,图形为直线及椭圆,为判断联结组标号提供了一种便捷思路。The correct judgment of connection group number is the premise of transformer parallel operation and differential protection.The traditional method of the judging transformer connection group is time-consuming and hard to figure out correctly.Based on Lissajous figure of judgment transformer connection group,a novel measurement method of analysis line-voltage phase relation of high pressure measurement and low pressure measurement is proposed in this paper.Firstly,the relationship between the high voltage winding line voltage and the low-voltage winding line voltage of the Lissajous mathematical model is established.Then,the design parameters of the gain module for the low voltage winding of the triangle connection method and the star connection method are presented respectively.Finally,the simulation of different connection groups of transformer is carried out by Matlab/Simulink software.The results from the simulation show that the Lissajous diagram is consistent with the connection symbol 12,the grading of connection group is an odd number,and the graph is circle and ellipse;the connection group number is even,the graph is a straight line and ellipse,which provides a convenient way for judging the connection group number.

关 键 词：变压器 联结组别 数学模型 外电路 李萨如图 

分 类 号：TM406[电气工程—电器]