扼流变压器的工作原理 扼流变压器的作用

Release time:2023-02-08
author:Ameya360
source:网络
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  扼流变压器又被称阻抗联接变压器。它的特点是既能将相邻的轨道电路中的信号电流隔开,又可使牵引电流通过它从一个轨道电路区段流向另一轨道电路区段,不致被钢轨绝缘隔断。是用于电气化区段双轨条轨道电路的钢轨绝缘处,对轨道电路中的信号电流起绝缘作用的一种特殊的变压器。今天Ameya360电子元器件采购网将给大家进行介绍!

扼流变压器的工作原理  扼流变压器的作用

  一、扼流变压器的工作原理

  扼流变压器的接线图如下图所示,其牵引线圈分为上、下两部分,上部线圈的末端与下部线圈的始端互相连接(如图),也叫中性点(简称中点)。当两根钢轨的牵引电流分别由上圈的始端和下圈的末端注入,由中点流出时,因为上、下两线圈匝数相同,而两线圈中电流的方向相反,在同一铁芯上两线圈所产生的磁能大小相等,方向相反,则信号线圈中不产生50Hz的感应电流。对25Hz信号电流来说,是由一根钢轨流向另一根钢轨,即从一个方向流经上、下牵引线圈,与信号线圈共同形成变压器。

  二、扼流变压器的作用

  扼流变压器安装于牵引回流与钢轨的连接处,用于导通牵引电流,或安装于区间上、下行轨道电路中平衡牵引电流,使之不影响轨道电路的正常工作。

  1、在ZPW-2000A轨道电路区段,用于线路间等电位连接(横向),平衡牵引电流。

  2、用于钢轨与贯通地线、架空回流线或保护线的连接,实现牵引回流。

  3、构成与邻近牵引变电所的大牵引回流通路。

  4、以其高移频阻抗,保证ZPW一2000A轨道电路的正常工作。

  扼流变压器在轨道电路中的作用是用以构通牵引电流,同时配合送电端供电变压器、受电端匹配变压器。

  由于轨道与大地之间是不绝缘的,所以牵引电流的一部分要流经大地,从埋设在牵引变电所下面的接地网回到变压器。同时钢轨和吸上线不直接相连,而是在轨道电路绝缘节处增设扼流变压器,二者分别与变压器的接线柱和中性点牢固连接,从而使牵引电流回路和轨道信号回路各自形成导通回路,互不干扰。


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