油浸式变压器温度场的可控发热模拟装置研究
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摘要
通过研究油浸式电力变压器的热生成与热传导机理,研制了一种内部热源的可控发热变压器模拟装置。利用热电偶传感器对内部热源的变压器进行多点测温,并把内部热源变压器绕组温度数据与油浸式变压器绕组温度进行分析和比较。结果表明,研制的变压器在额定功率工作条件下,顶层油温81.7℃,底层油温57.7℃,顶层绕组88.5℃,底层绕组72.9℃,顶层油温及关键节点温度和大型油浸式电力变压器绕组温度基本吻合,额定功率下最大温度偏差为0.5℃,1.3倍额定功率下最大温度偏差为0.6℃。
Through the study of the heat generation and heat conduction mechanisms of oil-immersed transformer,a controllable heating analog device with internal heat source is developed. Its temperature is measured at several points with a thermocouple sensor. Then,the temperatures of the windings of the heating analog device with internal heat source and the oil-immersed transformer are analyzed and compared. The results show that the top oil temperature of the transformer at the rated power that was developed in the paper is 81. 7 ℃; its bottom oil temperature is 57.7 ℃,its top winding temperature is 88.5 ℃,and its bottom winding temperature is 72.9 ℃. The top oil temperature and key nodal temperature are basically consistent with the temperature of the windings of the large oil-immersed power transformer. The maximum temperature deviation of the transformer at the rated power is 0.5 ℃,and its maximum temperature deviation at the 1.3 times rated power is 0.6 ℃.
Through the study of the heat generation and heat conduction mechanisms of oil-immersed transformer,a controllable heating analog device with internal heat source is developed. Its temperature is measured at several points with a thermocouple sensor. Then,the temperatures of the windings of the heating analog device with internal heat source and the oil-immersed transformer are analyzed and compared. The results show that the top oil temperature of the transformer at the rated power that was developed in the paper is 81. 7 ℃; its bottom oil temperature is 57.7 ℃,its top winding temperature is 88.5 ℃,and its bottom winding temperature is 72.9 ℃. The top oil temperature and key nodal temperature are basically consistent with the temperature of the windings of the large oil-immersed power transformer. The maximum temperature deviation of the transformer at the rated power is 0.5 ℃,and its maximum temperature deviation at the 1.3 times rated power is 0.6 ℃.
引文
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[2]王丰华,周翔,高沛,等.基于绕组热分布的改进油浸式变压器绕组热点温度计算模型[J].高电压技术,2015,41(3):895-901Wang F H,Zhou X,Gao P,et al. Improved thermal circuit model of hot spot temperature in oil-immersed transformers based on heat distribution of winding[J].High Voltage Engineering,2015,41(3):895-901(in Chinese)
[3]杨娜娜.变压器油温与绕组温度的变化关系分析[J].科技与企业,2015(10):202,203Yang N N. Analysis of relationship between transformer oil temperature and winding temperature[J]. ScienceTechnology Enterprise, 2015(10):202,203(in Chinese)
[4]滕黎,陈伟根,孙才新.油浸式电力变压器动态热路改进模型[J].电网技术,2012,36(4):236-241Teng L,Chen W G,Sun C X. An improved dynamic thermal circuit model of oil-immersed power transformer[J].Power System Technology,2012,36(4):236-241(in Chinese)
[5]张海燕,储晨昀,李元媛.变压器温度场的有限元分析[J].变压器,2011,48(3):25-28Zhang H Y,Chu C Y,Li Y Y. Finite element analysis of temperature field in transformer[J]. Transformer,2011,48(3):25-28(in Chinese)
[6] Swift G,Molinski T S,Lehn W. A fundamental approach to transformer thermal modeling. I. Theory and equivalent circuit[J]. IEEE Transactions on Power Delivery,2001,16(2):171-175
[7] Swift G,Molinski T S,Bray R,et al. A fundamental approach to transformer thermal modeling. II. Field verification[J]. IEEE Transactions on Power Delivery,2001,16(2):175-180
[8]廖延彪,黎敏,张敏,等.光纤传感技术与应用[M].北京:清华大学出版社,2009Liao Y B,Li M,Zhang M,et al. Optical fiber sensing techniques and applications[M]. Beijing:Tsinghua University Press,2009(in Chinese)
[9] Taheri S,Gholami A,Fofana I,et al. Modeling and simulation of transformer loading capability and hot spot temperature under harmonic conditions[J]. Electric Power Systems Research,2012,86:68-75
[10]李楠.变压器油温与绕组温度的变化分析[J].河南科技,2017(21):92-93Li N. Analysis of transformer oil temperature and winding temperature[J]. Henan Science and Technology,2017(21):92-93(in Chinese)
[11]张勇.变压器绕组温度在线监测及智能保护[J].通讯世界,2017(12):217-218Zhang Y. On-line monitoring and intelligent protection of transformer winding temperature[J]. Power Information,2017(12):217-218(in Chinese)
[12]单东雷.大型变压器绕组温度场的研究[D].北京:华北电力大学,2012:7-8Shan D L. The research on the temperature field of oilimmerged transformer winding[D]. Beijing:North China Electric Power University, 2012:7-8(in Chinese)
[13]陈伟根,刘娟,曹敏.基于信息融合的变压器内部故障诊断方法[J].高电压技术,2015,41(11):3797-3803Chen W G,Liu J,Cao M. Diagnosis method of internal fault for transformers based on information fusion[J].High Voltage Engineering,2015,41(11):3797-3803(in Chinese)
[14]王秀春,陶军普.大型自然油循环导向冷却变压器温度场研究[J].变压器,2008,45(7):6-10Wang X C,Tao J P. Temperature field research of large forced-directed oil cooling transformer[J]. Ransformer,2008,45(7):6-10(in Chinese)
[15] Zhao Z G,Zhang Y J,Li C,et al. Monitoring of coal mine roadway roof separation based on fiber Bragg grating displacement sensors[J]. International Journal of Rock Mechanics and Mining Sciences, 2015,74:128-132
[16]张师帅.计算流体动力学及其应用[M].武汉:华中科技大学出版社,2011:33,110Zhang S S. Computational fluid dynamics and its application[M]. Wuhan:Huazhong University of Science and Technology press, 2011:33,110(in Chinese)