A transformer excitation inrush current suppression technique using series current-limiting resistors

WU Ming; YU Zhen; GUO Qiang; YIN Shenfa; LI Changqiong; OU Zongjian

doi:10.3969/j.issn.1672-3643.2024.05.007

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A transformer excitation inrush current suppression technique using series current-limiting resistors

更新时间：2026-07-27

- A transformer excitation inrush current suppression technique using series current-limiting resistors
- Ningxia Electric Power Issue 5, (2024)
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- DOI：10.3969/j.issn.1672-3643.2024.05.007
  CLC：
- Online First：13 November 2024，
  
  Published：2024
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WU Ming, YU Zhen, GUO Qiang, et al. A transformer excitation inrush current suppression technique using series current-limiting resistors[J]. Ningxia Electric Power, 2024, (5).
DOI：

WU Ming, YU Zhen, GUO Qiang, et al. A transformer excitation inrush current suppression technique using series current-limiting resistors[J]. Ningxia Electric Power, 2024, (5). DOI： 10.3969/j.issn.1672-3643.2024.05.007.

摘要

针对变压器空载合闸励磁涌流较大易造成变压器保护误动的问题，运用数学工具分析了变压器空载合闸时的暂态电流及磁通变化，并在仿真平台搭建模型分析了不同合闸初相角和剩磁对三相变压器励磁涌流的影响，并总结了变压器励磁涌流的特点，提出了磁能转移吸收的原理。基于该原理设计出一种变压器合闸回路串联限流电阻的励磁涌流抑制技术电气模型，阐述了该技术的电气原理及软件控制策略。最后，使用仿真工具分析验证了不同条件下变压器合闸回路串联限流电阻的涌流抑制效果明显。

Abstract

To address the issue of transformer protection misoperation caused by large excitation inrush currents during no-load closing

this paper first uses mathematical tools to analyze the transient current and magnetic flux changes during transformer no-load closing.A model is built on the simulation platform to analyze the influence of different initial closing phase angles and residual magnetism on the excitation inrush current of three-phase transformers.The characteristics of transformer excitation inrush current are summarized

and the principle of magnetic energy transfer and absorption is proposed accordingly.Based on this principle

an electrical model of an excitation inrush current suppression technique using series current-limiting resistors in the transformer closing circuit is designed

and the electrical principle and software control strategy of this technique are explained.Finally

the simulation tool is used to analyze and verify that the technique of using series current limiting resistors in the transformer closing circuit has a significant suppression effect on inrush currents under different conditions.

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