Abstract：Breakdown voltage is a very important dielectric parameter for dielectric materials. The analysis of breakdown voltage during aging process of transformer insulation paper is of great significance for the mechanism research. Therefore, in this paper, a set of accelerate thermal aging experiments are designed under three different temperatures (90℃、110℃、130℃) and lasted for more than 500 days, and there are two oil-paper insulation systems made up with mineral oil/thermal upgraded insulation paper, and BIOTEMP oil/thermal upgraded insulation paper used in this experiment. The test specimens were sampled periodically and then the breakdown voltages were analyzed. Further more, the main reason of the breakdown value variation was discussed. The test results indicates that, under three different temperatures, the breakdown voltage of insulation paper in both the two insulation systems had the tendency of small increase, especially under 110℃ and 90℃. The breakdown voltage of KR is entirely higher than PR. There are no obviously relations between breakdown voltage and aging temperature, neither with DP of insulation paper. During thermal aging, water in oil-paper insulation is not equilibrium, water inside insulation paper is always below 2% and the affection to breakdown voltage made by water content is very tiny. Thus, to research the whole electric performance of oil-paper insulation in future, more attention should be paid to the overall oil-paper insulation system.
唐超, 廖瑞金, 黄飞龙, 杨丽君, 朱孟兆. 电力变压器绝缘纸热老化的击穿电压特性[J]. 电工技术学报, 2010, 25(11): 1-8.
Tang Chao, Liao Ruijin, Huang Feilong, Yang Lijun, Zhu Mengzhao. The Breakdown Voltage of Power Transformer Insulation Paper After Thermal Aging. Transactions of China Electrotechnical Society, 2010, 25(11): 1-8.
[1] 莫瑟H P, 达欣登V. 变压器绝缘纸板[M]. 朱英浩, 赵育文, 译. 沈阳: 辽宁科学技术出版社, 1997. [2] 刘玉仙. 油纸绝缘变压器中水分的聚积及其对热老化寿命的影响[J]. 变压器, 2004, 41(2): 8-13. [3] 路宝民, 原丽. 牵引变压器绝缘老化特性研究[J]. 变压器, 1997, 34(6): 19-23. [4] 董明, 严璋, 杨莉, 等. 基于证据推理的电力变压器故障诊断策略[J]. 中国电机工程学报, 2006, 26(1): 106-114. [5] Li Jian, Grzybowski S, Sun Yanfei, et al. Dielectric properties of rapeseed oil paper insulation[C]. 2007 Annual Report-Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Vancouver BC, Canada, 2007: 500-503. [6] Fofana I, Wasserberg V, Borsi H, et al. Challenge of mixed insulating liquids for use in high-voltage transformer[J]. IEEE Electrical Insulation Magazine, 2002, 18(4): 5-16. [7] Anurag Joshi, Sunil Kumar. Variation of dielectric strength of an insulation paper with thermal aging[J]. NDT & E International, 2005, 38(6): 459-461. [8] Saha T K, Darveniza M, Hill D J T, et al. Investigating the effects of oxidation and thermal degradation on electrical and chemical properties of power transformers insulation[J]. IEEE Transactions on Power Delivery, 1999, 14(6): 1359-1367. [9] 国标GB/T 1408—2006 绝缘材料电气强度试验方法 第1部分: 工频下试验[S]. [10] 国标GB/T 1548—2004 纸浆粘度的测定法[S]. [11] 国标GB7600—1987 运行中变压器油水分含量测定法 (库仑法)[S]. [12] 国标GB462—2003 纸与纸板水分测定方法[S]. [13] 国标GB/T 12914—2008 纸和纸板抗张强度的测定[S]. [14] Wasserberg V, Borsi H, Gockenbach E. Effects of different drying procedures on the composition of a liquid impregnated solid insulation[C]. Conference Record of the 2002 IEEE International Symposium on Electrical Insulation, Boston, USA, 2002: 346-349. [15] 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. [16] 刘玉仙. 变压器油纸绝缘的含湿分析及其对运行安全的影响[J]. 变压器, 2002, 39(5): 1-5. [17] 李晓虎, 李剑, 孙才新, 等. 植物油-纸绝缘的电老化寿命试验研究[J]. 中国电机工程学报, 2007, 27(9): 18-22. [18] Graminski E L. Stress-strain behaviour of accelerated and naturally aged papers[J]. Tappi Journal, 1970, 53(3): 406-410. [19] Morrison E L. Evaluation of the stability of electrical paper insulation[J]. IEEE Transactions on Electrical Insulation, 1968, 3(3): 76-82. [20] Koura A, Krausel T. Ageing of papers[J]. Papier, 1977, 31(10): 9-16. [21] Yasufuku S, Ishioka Y, Morita K. Tube ageing of oil filled transformer insulation and ageing of oil filled distribution transformers[C]. Proceedings of 14th Electrical and Electronic Insulation Conference, PARIS, France, 1979: 1-4.
2010, Vol. 25 
