Vibration Mechanism and Influence Factors in Power Transformers

doi:10.7652/xjtuxb201506019

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Vibration Mechanism and Influence Factors in Power Transformers

更新时间：2025-07-09

- Vibration Mechanism and Influence Factors in Power Transformers
- Vol. 49, Issue 6, Pages: 115-125(2015)
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201506019
  CLC： TM835.4
- Online First：10 June 2015，
  
  Published：2015
- 稿件说明：
移动端阅览
Vibration Mechanism and Influence Factors in Power Transformers[J]. 2015, 49(6): 115-125.
DOI：

Vibration Mechanism and Influence Factors in Power Transformers[J]. 2015, 49(6): 115-125. DOI： 10.7652/xjtuxb201506019.

摘要

为了研究变压器振动的产生机理

针对饼式绕组结构的油浸式电力变压器

利用铁心和绕组的数学模型

分析了振动产生机理、合成过程以及不同运行工况对振动特性的影响。搭建了基于压电式振动加速度传感器的振动测试平台

针对变压器进行了空载、负载、功率因数、三项不对称度以及油温等变压器运行工况因素对于变压器振动特性影响规律的试验。结果表明:变压器最大分接时的基频振动分量大于额定分接时的基频振动分量; 铁心以及绕组产生的振动信号在传递过程中并非线性叠加

箱体振动中基频分量随功率因数增加而增大; 三相不对称运行状态下的变压器振动信号中存在50、150以及250 Hz分量; 变压器箱体振动随油温上升呈线性增长趋势

且温度系数在0.005～0.035的范围内与变压器容量无关。研究结果为基于振动信号分析的变压器监测技术的进一步发展提供了参考。

Abstract

For an oil-immersed transformer core and pancake windings

the transformer vibration parameters are sought out and the vibration superposition is analyzed. The vibration monitoring system with piezoelectric vibration acceleration sensors is constructed and a series of experiments for the influence factors of the transformer vibration

such as current

power factor

unbalance factor and oil temperature

are conducted to investigate the vibration characteristics under different working conditions. It is found that the fundamental component of transformer tank under the greatest tapping is higher than that under principal tapping

transformer tank does not vibrate at linear superposition frequencies of core and windings; the fundamental component of transformer tank grows with the power factor; frequency components of 50 Hz

150 Hz and 250 Hz appear in the vibration signals of power transformer due to the asymmetry. The experiments show that the fundamental component of the transformer vibration signal increases linearly with the oil temperature; temperature coefficient stays within 0.005-0.035 and does not depend upon the transformer capacity.

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