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

被引：0
|
作者：
Liao W. [1 ]
Zhou L. [1 ]
Li H. [1 ]
Zhang C. [1 ]
Dai L. [1 ]
Li Z. [1 ]
机构：
[1] College of Electrical Engineering, Southwest Jiaotong University, Chengdu
来源：
Gaodianya Jishu/High Voltage Engineering | 2021年 / 47卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Aging rate; Impulse load; Oil-paper insulation; Service life; Thermal aging;
D O I：
10.13336/j.1003-6520.hve.20191965
中图分类号：
学科分类号：
摘要：
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 ana-lyzed. 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. © 2021, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
引用
收藏
页码：1403 / 1410
页数：7
相关论文
共 23 条
  • [1] LUNDGAARD L E, HANSEN W, LINHJELL D, Et al., Aging of oil-impregnated paper in power transformers, IEEE Transactions on Power Delivery, 19, 1, pp. 230-239, (2004)
  • [2] CAI Jinding, CHEN Hancheng, Aging diagnosis of oil-paper insulation based on trap density spectrum, High Voltage Engineering, 43, 8, pp. 2574-2581, (2017)
  • [3] IEEE Guide for loading mineral-oil-immersed transformers: IEEE C57.91-2011, (2012)
  • [4] Power transformers-Part 7: loading guide for oil-immersed power transformers: IEC 60076-7: 2005, (2005)
  • [5] PENG L, FU Q, LI L, Et al., Indirect detection of DP for insulating paper based on methanol content in transformer oil by spectroscopic approach, IEEE Transactions on Dielectrics and Electrical Insulation, 26, 1, pp. 90-94, (2019)
  • [6] LI Yuan, ZHANG Yin, TANG Feng, Et al., Investigations on quantitative evaluation modeling for determining the degree of polymerization of insulating paper by near infrared spectroscopy, Proceedings of the CSEE, 39, pp. 287-296, (2019)
  • [7] LIAO Ruijin, SUN Huigang, GONG Jing, Et al., Ageing kinetic model and lifetime model of oil-paper insulation in transformers, High Voltage Engineering, 37, 7, pp. 1576-1583, (2011)
  • [8] EMSLEY A M, STEVENS G C., Review of chemical indicators of degradation of cellulosic electrical paper insulation in oil-filled transformers, IEE Proceedings-Science, Measurement and Technology, 141, 5, pp. 324-334, (1994)
  • [9] FERNANDEZ-DIEGO C, ORTIZ A, FERNANDEZ I, Et al., Assessment of the effect of commercial vegetal oils on Kraft paper ageing through mechanical characterization, IEEE Transactions on Dielectrics and Electrical Insulation, 25, 5, pp. 1880-1887, (2018)
  • [10] LI J, ZHANG J, WANG F P, Et al., A novel aging indicator of transformer paper insulation based on dispersion staining colors of cellulose fibers in oil, IEEE Electrical Insulation Magazine, 34, 4, pp. 8-16, (2018)
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