星形-三角形联结三相变两相和三相变三相平衡变压器  

A Novel Three-Phase to Two-Phase and Three-Phase Balance Transformer in Y and △ Connection

作　　者：张志文[1] 王耀南[1] 

机构地区：[1]湖南大学电气与信息工程学院,长沙410082

出　　处：《电工技术学报》2006年第11期82-86,共5页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50247006);教育部重点研究(102174)资助项目

摘　　要：提出了一种新颖的星形?三角形联结三相变两相和三相变三相平衡变压器。该变压器采用三相三柱铁心结构,一次侧3个绕组构成三相系统,采用星形联结;二次侧5个绕组采用闭合三角形联结,便于三次谐波电流流通,改善了电压波形。从二次侧引出5个接线端子,其中两对或三个端子分别构成两相系统或三相系统。本文阐述了该变压器的基本原理、联结方案和基本方程,导出了一二次绕组的电流关系,得出了一次侧中性点电流为零的平衡条件和短路阻抗关系。本变压器绕组结构简单,适合于需要同时供给两相负载和三相负载,如牵引变电所用三相负载,高次谐波抑制或动态无功补偿等应用场合。A novel three-phase to two-phase and three-phase balance transformer in Y and △ connection were presented. Three-phase three-leg core is adopted in this transformer. Three systems consist of the r-connected primary windings. Five secondary windings are △ connected so that the third harmonic currents can flow, so voltage waveforms are approximate sine waves. Five connection terminals are exported in the secondary side. Two pair or three terminals compose two phase or three phase systems respectively. This paper expounded the principle, the connected scheme and basic equations of this transformer. The current relationships of the primary windings and second windings were derived from the basic equations. The balance condition, i.e., the neutral current in the primary side is zero, and the relationships of short circuit impedances were presented. This transformer with simple winding structures may be utilized to two-phase and three loads such as three loads of traction transformer substation, high order harmonic suppress or dynamic reactive power compensation.

关 键 词：星形-三角形联结 三相 两相 平衡变压器 

分 类 号：TM401[电气工程—电器]