变压器油纸绝缘状态的频域介电谱特征参量及评估方法

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摘要为了区分水分和老化产物对油纸绝缘频域介电特性的影响,进一步将频域介电谱测试方法更好地应用于评估变压器主绝缘的老化状态,本文在实验室中获得了不同水分含量及老化程度油纸绝缘试品的频域介电谱特性曲线,通过分析其变化规律,提出一种采用不同测试频率点对应介质损耗正切tanδ为特征参量,以区分水分和老化状态影响的评估方法,并初步给出了各参量与水分含量和老化状态的定量拟合公式。结果表明,tanδ在10^-3~10²Hz范围内随油纸绝缘水分含量增加而增大,而老化程度增加仅影响其在10^-3~10^-1Hz范围内的值;不同频率点对应的tanδ值与水分含量和绝缘纸聚合度的拟合曲线呈现指数函数关系。应用该研究方法对一台现场运行的电力变压器主绝缘绝缘纸的水分含量和聚合度值进行评估,初步验证了该方法的有效性。

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关键词 ：变压器, 油纸绝缘, 频域介电谱, 水分含量, 老化状态, 状态评估

Abstract：In order to apply the technology of frequency-domain dielectric spectroscopy(FDS) to assess the aging condition of the main insulation of transformer more accurately, the method of distinguishing the influence of moisture content and aging product on the dielectric property of oil-paper insulation in frequency domain is investigated in this paper. FDS properties of oil-paper insulation with different moisture contents and aging degrees are measured in laboratory under controllable condition. The loss factors tanδ corresponding to different measurement frequency points are proposed as characteristics to distinguish the influences of moisture contents and aging degrees. The quantitative relationships between the characteristics and the moisture content or aging degree are initially proposed. The results show that in the range of 10^-3 to 10² Hz, tanδ increases with the increase of moisture content, while the aging degree only affects the value of tanδ in the range of 10^-3 to 10^-1Hz; An exponential rule is observed in the relation between the tanδ at different frequency points and moisture content as well as the degree of polymerization(K_DP) of the insulation paper. A preliminary validity of the proposed method is verified by applying it to a power transformer in service to evaluate the moisture content and K_DP of its main insulation paper.

Key words： Transformer oil-paper insulation frequency-domain dielectric spectroscopy(FDS) moisture content aging state condition assessment

收稿日期: 2013-08-23 出版日期: 2015-03-23

PACS:

TM855

基金资助:国家自然科学基金资助项目(51277187)

作者简介: 杨丽君女,1980年生,博士,教授,博士生导师,从事电气设备绝缘在线监测与故障诊断研究。齐超亮男,1989年生,硕士研究生,从事电气设备在线监测与绝缘诊断研究。

引用本文:

杨丽君, 齐超亮, 吕彦冬, 廖瑞金, 高竣, 史江凌. 变压器油纸绝缘状态的频域介电谱特征参量及评估方法[J]. 电工技术学报, 2015, 30(1): 212-219. Yang Lijun, Qi Chaoliang, Lü Yandong, Liao Ruijin, Gao Jun, Shi Jiangling. Characteristic Parameters and Assessment Methods of Frequency-Domain Dielectric Spectroscopy of Oil-Paper Insulation for Transformers. Transactions of China Electrotechnical Society, 2015, 30(1): 212-219.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I1/212

[1] 廖瑞金, 杨丽君, 孙才新, 等. 基于局部放电主成分因子向量的油纸绝缘老化状态统计分析[J]. 中国电机工程学报, 2006, 26(14): 114-119. Liao Ruijin, Yang Lijun, Sun Caixin, et al. Aging condition assessment of oil-paper based on principal component and factor analysis of partial discharge[J]. Proceedings of the CSEE, 2006, 26(14): 114-119.
[2] 岂小梅. 变压器绕组变形的综合判断及经验总结[J]. 电网技术, 2006, 30(25): 220-222. Qi Xiaomei. Synthetic diagnosis and experience about winding deformation of transformer[J]. Power System Technology, 2006, 30: 220-222.
[3] 杨丽君, 廖瑞金, 孙会刚, 等. 油纸绝缘热老化特性及生成物的对比分析[J]. 中国电机工程学报, 2008, 28(22): 53-58. Yang Lijun, Liao Ruijin, Sun Huigang, et al. Contrasting analysis and investigation on properties and products of oil-paper during thermal aging process[J]. Procee- dings of the CSEE, 2008, 28(22): 53-58.
[4] 周利军, 汤浩, 吴广宁, 等. 油纸绝缘微水扩散的稳态分布[J]. 高电压技术, 2007, 33(8): 27-30. Zhou Lijun, Tang Hao, Wu Guangning, et al. Equili- brium moisture distribution in oil-paper insulation[J]. High Voltage Engineering, 2007, 33(8): 27-30.
[5] Kuang Y C, Chen G, Jarman P. Recovery voltage measurement on oil-paper insulation with simple geometry and controlled environment[C]. Proceedings of the 2004 IEEE International Conference on Solid Dielectrics, Toulouse, France, 2004, 2: 739-742.
[6] Saha T K, Yao Z T. Experience with return voltage measurements for assessing insulation conditions in service-aged transformers[J]. IEEE Transactions on Power Delivery, 2003, 18(1): 128-135.
[7] Saha T K, Purkait P. Investigation of polarization and depolarization current measurements for the assessment of oil-paper insulation of aged transformers[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2004, 11(1): 144-154.
[8] Roongroj C, Pattanadech N, Praisuwanna P, et al. Equivalent circuit approximation of transformer insula- tion by using PDC measurement[C]. 5th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Tech- nology, Dhaka, Bangladesh, 2008, 2: 925-928.
[9] 宋伟. 变压器老化评估的极化去极化电流分析法[J]. 变压器, 2005, 42(7): 28-34. Song Wei. Polarization current analysis for transformer ageing assessment[J]. Transformer, 2005, 42(7): 28- 33.
[10] Yew J H, Pradhan M K, Saha T K. Effects of moisture and temperature on the frequency domain spectroscopy analysis of power transformer insulation[C]. IEEE Power Engineering Society General Meeting, Pittsburgh, USA, 2008.
[11] Farahani M, Borsi H, Gockenbach E. Dielectric response studies on insulating system of high voltage rotating machines[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2006, 13(2): 383-393.
[12] Yew J H, Saha T K, Thomas A J. Impact of temperature on the frequency domain dielectric spectroscopy for the diagnosis of power transformer insulation[C]. IEEE Power Engineering Society General Meeting, Montreal, Canada, 2006: 2672-2678.
[13] Zaengl W S. Dielectric spectroscopy in time and frequency domain for HV power equipment. I. Theoretical considerations[J]. IEEE Transactions on Electrical Insulation Magazine, 2003, 19(5): 5-19.
[14] 廖瑞金, 袁泉, 唐超, 等. 不同老化因素对油纸绝缘介质频域谱特性的影响[J]. 高电压技术, 2010, 36(7): 1612-1618. Liao Ruijin, Yuan Quan, Tang Chao, et al. Influence of different aging conditions on characteristics of frequency domain spectroscopy of oil-paper insulation medium[J]. High Voltage Technology, 2010, 36(7): 1612-1618.
[15] 廖瑞金, 郝建, 杨丽君, 等. 变压器油纸绝缘频域介电谱特性的仿真与实验研究[J]. 中国电机工程学报, 2010, 30(22): 113-119.
Liao Ruijin, Hao Jian, Yang Lijun, et al. Simulation
16 and experimental study on frequency-domain dielectric spectroscopy of oil-paper insulation for transformers [J]. Proceedings of the CSEE, 2010, 30(22): 113-119.
[16] Saha T K, Middleton R, Thomas A. Understanding frequency & time domain polarization methods for the insulation condition assessment of power transformers [C]. 2009 IEEE Power & Energy Society General Meeting, Calgary, Canada, 2009: 1456-1463.
[17] CIGRE TF D1. 01. 09. Dielectric response diagnoses for transformer windings[R]. Paris, France, 2002.
[18] Aradhana R, Sridhar S, Papneja G S, et al. Moisture and dielectric properties analysis of power transformer by dirana measurement[J]. Water and Energy Interna- tional, 2010, 67(1): 333-344.
[19] Lundgaard L E, Hansen W, Linhjell D, et al. Aging of oil-impregnated paper in power transformers[J]. IEEE Transactions on Power Delivery, 2004, 19(1) 230-239.
[20] Liao R, Hao J, Chen G, et al. Quantitative analysis of ageing condition of oil-paper insulation by frequency domain spectroscopy[J]. IEEE Transactions on Dielec- trics and Electrical Insulation, 2012, 19(3): 821-830.
[21] Gafvert U. Influence of geometric structure and material properties on dielectric frequency response of composite oil cellulose insulation[C]. Proceedings of the International Symposium on Electric Insulating Materials, Kitakyushu, Japan, 2005, 1: 73-76.
[22] Setayeshmehr A, Fofana I, Eichler C, et al. Dielectric spectroscopic measurements on transformer oil-paper insulation under controlled laboratory conditions[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2008, 15(4): 1100-1111.
[23] 中华人民共和国电力工业部. DL/T 596—1996电力设备预防性试验规程[S]. 北京: 中国电力出版社, 1996.
[24] 中华人民共和国国家发展和改革委员会. DL/T 984—2005油浸式变压器绝缘老化判断导则[S]. 北京: 中国电力出版社, 2005.