Study on Frequency Domain Characteristics of Moisture in Oil-Paper Insulation Based on Extended Debye Model
Du Lin1, Ran Liman1, Wei Chao2, Yang Lijun1, Yang Feng1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. State Grid Jiangsu Electric Power Company Research Institute Nanjing 211103 China
摘要 为充分挖掘频域介电谱（FDS）携带油纸绝缘状态信息,提取油纸绝缘受潮状态特征量,首先分析基于FDS的油纸绝缘扩展德拜模型参数随温度及微水含量的变化规律,并提取两个油纸绝缘受潮状态特征量——特征频率处（10-3 Hz、10-2 Hz、10-1 Hz和100 Hz）的介质损耗和10-2~ 102 Hz范围内的介质损耗斜率KP。研究表明,扩展德拜模型参数对油纸绝缘微水含量十分敏感,随微水含量的增加,绝缘电阻R0单调减小,大时间常数和中时间常数支路极化电容Ci单调增大,而几何电容C0几乎不变。此外,温度也显著影响等效模型参数,因此频域介电测试需保持温度的一致性。提取的状态量特征频率处介质损耗和介质损耗斜率Kp分别与微水含量存在指数关系和线性关系,有助于实现油纸绝缘微水含量的定量评估。
Abstract To fully understand insulation information carried by frequency domain spectroscopy (FDS) and extract characteristic quantities of moisture in oil-paper insulation, the paper investigated the moisture and temperature effects on extended Debye model of oil-paper insulation based on FDS, and proposed two characteristic quantities of moisture: dielectric loss at characteristic frequencies (10-3 Hz、10-2 Hz、10-1 Hz和100 Hz) and slope of dielectric loss KP in the range of 10-2 to 102 Hz. Results show that extended Debye model parameters are sensitive to moisture. Insulation resistance R0 decreases monotonically with increasing moisture content, while polarization capacitance Ci in large and median time constant polarization branches is in the opposite trend. C0 is basically unchanged with different moisture content. Further, test temperature impacts on model parameters which needs to keep the temperature constant. In addition, the extracted characteristic parameter of dielectric loss at characteristic frequencies shows an exponential relationship with moisture content, and slope of dielectric loss Kp has a linear relation to moisture content, which will be supportive for moisture assessment of oil-paper insulation.
杜林, 冉鹂蔓, 蔚超, 杨丽君, 杨峰. 基于扩展德拜模型的油纸绝缘受潮频域特征量研究[J]. 电工技术学报, 2018, 33(13): 3051-3058.
Du Lin, Ran Liman, Wei Chao, Yang Lijun, Yang Feng. Study on Frequency Domain Characteristics of Moisture in Oil-Paper Insulation Based on Extended Debye Model. Transactions of China Electrotechnical Society, 2018, 33(13): 3051-3058.
[1] Wang M, Vandermaar A J, Srivastava K D.Review of condition assessment of power transformers in service[J]. IEEE Electrical Insulation Magazine, 2002, 18(6): 12-25. [2] Saha T K, Purkait P.Investigation of an expert system for the condition assessment of transformer insulation based on dielectric response measurements[J]. IEEE Transactions on Power Delivery, 2004, 19(3): 1127-1134. [3] 高竣, 廖瑞金, 王有元, 等. 基于扩展Debye模型的变压器油纸绝缘老化特征量研究[J]. 电工技术学报, 2016, 31(4): 211-217. Gao Jun, Liao Ruijin, Wang Youyuan, et al.Ageing characteristic quantities of oil-paper insulation for transformers based on extended Debye model[J]. Transactions of China Electrotechnical Society, 2016, 31(4): 211-217. [4] 廖瑞金, 孙会刚, 尹建国, 等. 水分对油纸绝缘热老化速率及热老化特征参量的影响[J]. 电工技术学报, 2012, 27(5): 34-42. Liao Ruijin, Sun Huigang, Yin Jianguo, et al.Influence on the thermal aging rate and thermal aging characteristics caused by water content of oil-paper insulation[J]. Transactions of China Electrotechnical Society, 2012, 27(5): 34-42. [5] 李明华, 董明, 严璋. 一种新的绝缘测试方法——回复电压法[J]. 高电压技术, 2002, 28(8): 43-45. Li Minghua, Dong Ming, Yan Zhang.A new insulation testing method-return voltage method[J]. High Voltage Engineering, 2002, 28(8): 43-45. [6] 许维宗, 刘勇, 许文蕾, 等. 电力变压器油纸绝缘状态的诊断——回复电压法[J]. 华中电力, 2007, 20(4): 4-7. Xu Weizong, Liu Yong, Xu Wenlei, et al.Diagnosis of power transformer oil-paper insulation condition-recovery voltage method[J]. Central China Electric Power, 2007, 20(4): 4-7. [7] 马志钦, 廖瑞金, 郝建, 等. 温度对油纸绝缘极化去极化电流的影响[J]. 电工技术学报, 2014, 29(4): 290-297. Ma Zhiqin, Liao Ruijin, Hao Jian, et al.Influence of temperature on polarization and depolarization current of oil-paper insulation[J]. Transactions of China Electrotechnical Society, 2014, 29(4): 290-297. [8] 唐盼. 基于极化去极化电流法的变压器油纸绝缘状态研究[D]. 上海: 上海交通大学, 2012. [9] 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 and experimental study on frequency-domain dielectric spectroscopy of oil-paper insulation for transformers[J]. Proceedings of the CSEE, 2010, 30(22): 113-119. [10] 彭华东, 董明, 吴雪舟, 等. 油纸绝缘频域介电谱影响因素研究[J]. 高压电器, 2013, 49(1): 6-12. Peng Huadong, Dong Ming, Wu Xuezhou, et al.Influencing factors on frequency-domain dielectric spectroscopy of oil-paper insulation system[J]. High Voltage Apparatus, 2013, 49(1): 6-12. [11] 董明, 刘媛, 任明, 等. 油纸绝缘频域介电谱解释方法研究[J]. 中国电机工程学报, 2015, 35(4): 1002-1008. Dong Ming, Liu Yuan, Ren Ming, et al.Explanation study of frequency-domain dielectric spectroscopy for oil-paper insulation system[J]. Proceedings of the CSEE, 2015, 35(4): 1002-1008. [12] Blennow J, Ekanayake C, Walczak K, et al.Field experiences with measurements of dielectric response in frequency domain for power transformer diagnostics[J]. IEEE Transactions on Power Delivery, 2006, 21(2): 681-688. [13] 王有元, 高竣, 刘捷丰, 等. 变压器油纸绝缘老化与水分含量评估频域介电特征量[J]. 电工技术学报, 2015, 30(22): 215-221. Wang Youyuan, Gao Jun, Liu Jiefeng, et al.Aging and moisture evaluation characteristic parameters for oil-paper insulation of transformer using frequency dielectric spectroscopy[J]. Transactions of China Electrotechnical Society, 2015, 30(22): 215-221. [14] 刘捷丰, 廖瑞金, 吕彦冬, 等. 电力变压器油纸绝缘含水量定量评估的时域介电特征量[J]. 电工技术学报, 2015, 30(2): 196-203. Liu Jiefeng, Liao Ruijin, Lü Yandong, et al.Time domain dielectric characteristics for quantitative assessment of moisture content in transformer oil-paper insulation[J]. Transactions of China Electrotechnical Society, 2015, 30(2): 196-203. [15] 张涛. 基于回复电压特征量的变压器油纸绝缘状态诊断研究[D]. 福州: 福州大学, 2010. [16] Zhang Tao, Li Xiaoqin, Lü Haoyun, et al.Parameter identification and calculation of return voltage curve based on FDS data[J]. IEEE Transactions on Applied Superconductivity, 2014, 24(5): 1-5. [17] Saha T K, Purkait P, Muller F.Deriving an equiva-lent circuit of transformers insulation for understanding the dielectric response measurements[J]. IEEE Transactions on Power Delivery, 2005, 20(1): 149-157. [18] Zaengl W S.Dielectric spectroscopy in time and frequency domain for HV power equipment. I. Theoretical considerations[J]. IEEE Electrical Insulation Magazine, 2003, 19(5): 5-19. [19] 马志钦. 变压器油纸绝缘的频域介电响应特性与绝缘状态评估方法研究[D]. 重庆: 重庆大学, 2012. [20] 高竣, 廖瑞金, 王有元, 等. 油纸绝缘水分平衡样品的制备及水分评估频域特征量提取[J]. 电工技术学报, 2015, 30(18): 196-202. Gao Jun, Liao Ruijin, Wang Youyuan, et al.Preparation of oil-paper insulation samples with moisture equilibrium and frequency domain characteristic parameters extraction for moisture assessment[J]. Transactions of China Electrotechnical Society, 2015, 30(18): 196-202.
2018, Vol. 33 
