Abstract：This paper proposes a judgment method of Differential dielectric spectroscopy method for the polarization branches number of equivalent circuit of oil-paper insulation.In order to better assess the state of the transformer oil-paper insulation aging,this paper put forward depolarization quantity of electricity models to assess the state of the transformer oil-paper insulation based on the theory of dielectric and Equivalent Circuit Method. The depolarization current curve for different insulation status is different, so several characteristics are proposed. They include the polarization branches number, polarization component, atypical linear and polarization response time. Based on the multiple sets of transformer depolarization current curve, the polarization response time will be smaller and the others will be biger with the deterioration of insulating state. This method provides a new way for the accurate assessment of oil-paper insulation.
王岭, 蔡金锭. 基于去极化电量时域微分谱线时域特征量的变压器绝缘老化研究[J]. 电气技术, 2017, 18(6): 27-33.
Wang Ling, Cai Jinding. Differential Time-Domain Spectroscopy based on Depolarization Charge Measurement for Diagnosis of Oil-paper Insulation Condition. Electrical Engineering, 2017, 18(6): 27-33.
[1] KÜCHLER A, LIEBSCHNER M, REUMANN A, et al. Evaluation of conductivities and dielectric properties for highly stressed HVDC insulating materials[M]. CIGRE Session, Paris 2010. [2] Yang X, Nielsen S, Ledwich G. Investigations of dielectric monitoring on an energised transformer oil-paper insulation system[J]. IET Sci., Measurement Technology, 2010, 9(1): 102-112. [3] 廖瑞金, 杨丽君, 郑含博, 等. 电力变压器油纸绝缘热老化研究综述[J]. 电工技术学报, 2012, 27(5): 1-12. [4] Saha T K. Review of modern diagnostic techniques for assessing insulation condition in aged transformers[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2003, 10(5): 903-917. [5] Saha T K. Review of time—domain polarization measurements for assessing insulation condition in aged transform—ers[J]. IEEE Transactions on Power Dielectrics, 2003, 18(4): 1293-1301. [6] Gilbert R, Jalbert J, Duchesne S, et al. Kinetics of theproduction of chain end groups and methanol from the de-polymerization of cellulose during the ageing of paper/oilsystems, part2: thermally upgraded insulating papers[J]. Cellulose, 2010, 17(2): 253-269. [7] 黄云程, 蔡金锭. 应用去极化能量谱评估变压器绝缘老化受潮状态[J]. 电工电能新技术, 2016, 35(1): 53-59. [8] 李景德, 曹万强, 李向前, 等. 时域介电谱方法及其应用[J]. 物理学报, 1996, 45(7): 1225-1231. [9] 李景德, 雷德铭. 电介质材料物理和应用[M]. 广州: 中山大学出版社, 1992. [10] 王林, 周利军, 李先浪, 等. 应用极化/去极化电流法分析油纸绝缘微水扩散暂态过程[J]. 高电压技术, 2013, 39(2): 354-359. [11] 邓鹏. 变压器绝缘故障预测诊断的方法[J]. 四川电力技术, 2006, 29(4): 4-6. [12] 李功新, 江修波, 蔡金锭, 等. 采用微分去极化电流法解析变压器油纸绝缘的介质响应函数[J]. 高电压技术, 2012, 38(8): 1930-1936. [13] Li Jingde, Chen Min, Zheng Feng, et al. Diffusion theoryof slow responses[J]. Sci. in China (Series A), 1997, 40(3): 290-296. [14] Li G X, Jiang X B, Huang Y J, et al. Dielectric response function for transformer oil-paper insulation solved by the method of differential depolarization current[J]. High Voltage Engineering, 2012, 38(8): 1930-1936.
2017, Vol. 18 
