Effects of Impulse Loads on the Thermal Aging of Traction Transformer Oil-paper Insulation

LIAO Wei; ZHOU Lijun; LI Huize; ZHANG Chuanhui; DAI Luyu; LI Zhixin

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Effects of Impulse Loads on the Thermal Aging of Traction Transformer Oil-paper Insulation

更新时间：2025-12-08

- Effects of Impulse Loads on the Thermal Aging of Traction Transformer Oil-paper Insulation
- Vol. 47, Issue 4, Pages: 1403-1410(2021)
- 作者机构：
  
  西南交通大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 April 2021，
  
  Published：2021
- 稿件说明：
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LIAO Wei, ZHOU Lijun, LI Huize, et al. Effects of Impulse Loads on the Thermal Aging of Traction Transformer Oil-paper Insulation[J]. 2021, 47(4): 1403-1410.
DOI：

LIAO Wei, ZHOU Lijun, LI Huize, et al. Effects of Impulse Loads on the Thermal Aging of Traction Transformer Oil-paper Insulation[J]. 2021, 47(4): 1403-1410. DOI：

摘要

为了研究冲击负荷对牵引变压器油纸绝缘热老化的影响

考虑冲击负荷的负荷率、持续时间和时间间隔3个因素设计了油纸绝缘的冲击负荷加速热老化试验

分析了不同冲击负荷条件下油纸绝缘试样老化过程中绝缘纸聚合度和拉伸强度的变化规律

并使用Ekenstam老化动力学模型和熵值法分析了试样的热老化数据

同时将测试结果换算到额定负荷老化速率下的运行寿命以分析冲击负荷对油纸绝缘运行寿命的影响。结果表明:通过试验明确了冲击负荷的负荷率、持续时间和时间间隔均对油纸绝缘的老化速率有明显影响且影响强度近似;Ekenstam模型的老化速率、速率系数和等效温度均与负荷率和持续时间成正相关

与时间间隔成负相关关系;随着牵引负荷的负载率和持续时间的增加油纸绝缘运行寿命降低

时间间隔增大

运行寿命增加。但是运行寿命与冲击负荷之间的关系还有待进一步研究。

Abstract

In order to study the influence of impulse loads on the aging of oil paper insulation of traction transformer

in this paper

the accelerated thermal aging tests of oil-paper insulation under impulse loads were designed considering 3 factors such as the load rate

lasting time

and time interval of impulse loads. The change law of the degree of polymerization and tensile strength of the paper insulation during the aging process of the samples with different impulse load conditions were analyzed. The thermal aging data of oil-paper insulation under impulse loads were analyzed by using the Ekenstam aging dynamic model and entropy method

meanwhile

the impact of impulse loads on the operating life of oil-paper insulation was analyzed by converting the test results to the operating life at the rated load. The results show that the impulse load has an obvious effect on the aging rate and service life of oil-paper insulation and the impact strength is similar. Then

the aging rate

rate parameters and equivalent temperature in the Emsley model all have positive relations with the load rate and lasting time

and have negative relations with time interval. As the load rate and lasting time increase

the operating life of the oil-paper insulation decreases

and the greater the time interval

the longer the operating life. However

the relationship between service life and impulse load needs further study.

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