Influence of Stress Distribution of the Converter Transformer Valve Side Bushing Flange Under Vibration on Its Fatigue Life

YAN Ruiqi; ZHANG Jinyin; WEI Xiaoxing; WANG Zhong

doi:10.13296/j.1001-1609.hva.2026.01.018

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Influence of Stress Distribution of the Converter Transformer Valve Side Bushing Flange Under Vibration on Its Fatigue Life

Research & Analysis | 更新时间：2026-04-13

- Influence of Stress Distribution of the Converter Transformer Valve Side Bushing Flange Under Vibration on Its Fatigue Life
- High Voltage Apparatus Vol. 62, Issue 1, Pages: 143-151(2026)
- 作者机构：
  
  四川大学电气工程学院，成都　610065
  中国南方电网超高压输电公司检修试验中心，广州　510663
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.01.018
  CLC：
- Received：11 July 2025，
  
  Revised：2025-09-26，
  
  Published：16 January 2026
- 稿件说明：
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YAN Ruiqi, ZHANG Jinyin, WEI Xiaoxing, et al. Influence of Stress Distribution of the Converter Transformer Valve Side Bushing Flange Under Vibration on Its Fatigue Life[J]. High Voltage Apparatus, 2026, 62(1): 143-151.
DOI：

YAN Ruiqi, ZHANG Jinyin, WEI Xiaoxing, et al. Influence of Stress Distribution of the Converter Transformer Valve Side Bushing Flange Under Vibration on Its Fatigue Life[J]. High Voltage Apparatus, 2026, 62(1): 143-151. DOI： 10.13296/j.1001-1609.hva.2026.01.018.

摘要

在换流变压器长期振动载荷下，其阀侧套管金属法兰容易因应力集中而出现疲劳开裂，但如今针对套管法兰应力和疲劳寿命的研究还相对匮乏。文中参考实际套管建立阀侧套管模型，采用有限元仿真方法得到不同振动载荷和套管结构下法兰应力和振动疲劳寿命。研究发现：在不同振动方向下，由于交变应力和静态应力的共同影响，套管法兰在

向振动下疲劳寿命最小，在

向下最大；在不同振动频率或幅值下，法兰疲劳寿命随着交变应力的增大而减小，而危险点处静态应力几乎不变。改变套管结构，发现主要是通过减小静态应力来增大法兰寿命，而法兰受到的交变应力几乎不变。最后采用曲面拟合的方法得到金属法兰应力与疲劳寿命之间的关系。研究结果对预测和提高金属法兰疲劳寿命具有指导意义和工程实用价值。

Abstract

Under long-term vibration loads of the converter transformer

the metal flange of its valve-side bushing is prone to fatigue cracking due to stress concentration

yet current research on the stress and fatigue life of bushing flanges remains relatively scarce. In this paper

a valve-side bushing model is established with reference to the actual bushing

and the finite element simulation method is adopted to obtain the flange stress and vibration fatigue life under different vibration loads and bushing structures. The research findings indicate that under different vibration directions

owing to the combined effect of alternating stress and static stress

the fatigue life of the bushing flange is the minimum under

-direction vibration and the maximum under

-direction vibration. Under different vibration frequencies or amplitudes

the fatigue life of the flange decreases with the increase of alternating stress

while the static stress at the dangerous point remains almost unchanged. By modifying the bushing structure

it is found that the extension of flange service life is mainly achieved by reducing the static stress

whereas the alternating stress acting on the flange shows nearly no change. Finally

the relationship between the stress and fatigue life of the metal flange is derived using the surface fitting method. The research results hold both guiding significance and engineering practical value for predicting and improving the fatigue life of metal flanges.

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references

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