Method to Estimate Maximum Inrush Current Caused by Energizing No-load Transformer

LIU Xiaohua; HUANG Jing; RUAN Mianhui; ZENG Qinghui

doi:10.13296/j.1001-1609.hva.2014.04.022

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Method to Estimate Maximum Inrush Current Caused by Energizing No-load Transformer

更新时间：2025-04-26

- Method to Estimate Maximum Inrush Current Caused by Energizing No-load Transformer
- High VoltageApparatus Vol. 50, Issue 4, Pages: 120-124+130(2014)
- 作者机构：
  
  佛山供电局
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2014.04.022
  CLC： TM406
- Published：2014
- 稿件说明：
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[1]刘晓华,黄静,阮绵晖,曾庆辉.一种计算空投变压器励磁涌流最大值的方法[J].高压电器,2014,50(04):120-124+130.

LIU Xiaohua, HUANG Jing, RUAN Mianhui, et al. Method to Estimate Maximum Inrush Current Caused by Energizing No-load Transformer[J]. High voltageapparatus, 2014, 50(4): 120-124+130.
[1]刘晓华,黄静,阮绵晖,曾庆辉.一种计算空投变压器励磁涌流最大值的方法[J].高压电器,2014,50(04):120-124+130. DOI： 10.13296/j.1001-1609.hva.2014.04.022.

LIU Xiaohua, HUANG Jing, RUAN Mianhui, et al. Method to Estimate Maximum Inrush Current Caused by Energizing No-load Transformer[J]. High voltageapparatus, 2014, 50(4): 120-124+130. DOI： 10.13296/j.1001-1609.hva.2014.04.022.

摘要

提出了一种计算投入空载变压器时引起的励磁涌流最大值的方法。基于对空投变压器励磁涌流机理的分析

提出根据变压器的铭牌基本参数

并通过磁通饱和点的定位

确定变压器的磁化特性曲线大致形状

利用磁化曲线饱和区段近似于线性的特性跟踪磁通变化

估算励磁涌流的最大值

并计算最大励磁涌流引起电压暂降的深度及持续时间。通过对一个配电变压器及电力变压器进行空载合闸操作仿真

对比仿真结果和计算结果

结果验证了所提方法的有效性和准确性。

Abstract

A method is proposed to estimate maximum inrush current caused by energizing no-load transformer. Based on the mechanism that energizing no-load transformer causes inrush current

according to the basic parameters of transformer’s nameplate and the magnetic flux saturation point to establish nonlinear magnetization curve. The linear features of saturated magnetization curve segment is used to estimate the maximum inrush current. The maximum depth and the duration of voltage sag are calculated. According to the magnetic flux decay time to estimate the duration of voltage sag. The process of closing no-load distribution transformer and power transformer is simulated

and the simulated result is compared to the calculated result. It is shown that the proposed method is validity and accuracy.

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