基于晶闸管开关的变压器励磁涌流抑制方法

A Novel Method for Restraining Inrush Current of Transformer Based on Pre-excitation and SCR Parallel Sets

变压器作为电力供配电领域的核心部件,其应用的安全性受到学者的关注。由于变压器是铁磁元件,不可避免地存在剩磁问题,这就带来了空载合闸时的励磁涌流问题,而利用分相合闸策略可有效抑制变压器空载合闸励磁涌流。对该方法进行了分析,并指出现有方法存在的问题。基于分相合闸基本原则,提出了先进行预充磁,再利用晶闸管作为开关器件的分相投入新方法,并通过仿真和实验验证了该方法的有效性。

As a key component used for transporting power,the safety of power transformer attract more and more at-tention of the researcher.And what difficult to deal with is the remanences of the power transformer and the following excitation inrush current.The inrush current will generate when a transformer is connected to power grid with no load.Controlled switching method is effective to restrain it,an analysis is done,which points out the problem of present methods.Based on the same principle,a strategy using SCR as the switch component is proposed,and what＇s more,the simulation and experiment are carried out,and the results prove the effectivity of the strategy.