Analysis of Imaginary Part of Frequency Domain Spectroscopy for Oil-Paper Insulation Transformer
Zhang Daning1, Liu Xiaowei2, Zhan Jiangyang3, Li Xiaoxia2, Tian Jie4, Mu Haibao1
1. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China;; 2. State Grid Shaanxi Electric Research Institute Xi’an 710100 China;; 3. State Grid Zhejiang Electric Research Institute Hangzhou 310014 China; 4. Shenzhen Power Supply Co. Ltd Shenzhen 518000 China
Abstract：The insulation diagnosis method based on frequency domain dielectric spectrum (FDS) has been widely used in field test because of its nondestructive testing and rich insulation information. However, FDS measurement results are susceptible to many factors, such as impurity ion, temperature changes, and transformer structure, and so on. The interpretation on the dielectric properties of oil paper insulation with the influence of moisture content and impurity ion concentration is not very ideal, thus more appropriate and effective simulation and experimental analysis of dielectric response characteristics are needed. In this paper, based on the experimental results, the extended Debye model parameters of the field transformer are obtained. Then, the influence of the insulation resistance value in the Debye model on the FDS curve is simulated by Matlab modeling. The results show that the variations of the FDS conductance process is obviously affected by the impurity ions, different from those by the water content. The impurity ions mainly affect the low frequency section of the imaginary part of the complex capacitor.
张大宁, 刘孝为, 詹江杨, 李晓霞, 田杰, 穆海宝. 变压器油纸绝缘频域介电谱的虚部分析[J]. 电工技术学报, 2019, 34(4): 847-854.
Zhang Daning, Liu Xiaowei, Zhan Jiangyang, Li Xiaoxia, Tian Jie, Mu Haibao. Analysis of Imaginary Part of Frequency Domain Spectroscopy for Oil-Paper Insulation Transformer. Transactions of China Electrotechnical Society, 2019, 34(4): 847-854.
[1] 梁旭明, 张平, 常勇. 高压直流输电技术现状及发展前景[J]. 电网技术, 2012, 36(4): 1-9. Liang Xuming, Zhang Ping, Chang Yong.Recent advances in high-voltage direct-current power transmission and its developing potential[J]. Power System Technology, 2012, 36(4): 1-9. [2] 杨丽君, 齐超亮, 吕彦冬, 等. 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, et al.Characteristic parameters and assessment methods of frequency-domain dielectric spectroscopy of oil- paper insulation for transformers[J]. Transactions of China Electrotechnical Society, 2015, 30(1): 212-219. [3] 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. [4] Mahesh P, Thota S, Pamu D.Dielectric response and AC-conductivity studies of Gd2O3-contained K0.5Na0.5NbO3 piezoelectric ceramics[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2015, 22(6): 3668-3675. [5] Saha T K, Purkait P.Investigation of an expert system for the condition assessment of transformer insulation based on dielectric response measure- ments[J]. IEEE Transactions on Power Delivery, 2004, 19(3): 1127-1134. [6] Wolny S.Aging degree evaluation for paper-oil insulation using the recovery voltage method[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2015, 22(5): 2455-2462. [7] Sha Yanchao, Zhou Yuanxiang, Nie Dexin, et al.A study on electric conduction of transformer oil[J]. IEEE Transactions on Dielectrics & Electrical Insulation, 2014, 21(3): 1061-1069. [8] Carlsson C, Gäfvert U, Marinko J.Space charge and ionic conduction in transformer oil[C]//Conference on Electrical Insulation & Dielectric Phenomena- Annual Report, Amherst, NY, USA, 1985, DOI: 10.1109/CEIDP.1985.7728132. [9] Farahani M, Borsi H, Gockenbach E.Dielectric response studies on insulating system of high voltage rotating machines[J]. IEEE Transactions on Diele- ctrics and Electrical Insulation, 2006, 13(2): 383-393. [10] Hill D J T, Le T T, Darveniza M, et al. A study of the degradation of cellulosic insulation materials in a power transformer. Part III: degradation products of cellulose insulation paper[J]. Polymer Degradation and Stability, 1996, 51(2): 211-218. [11] Gao Jun, Yang Lijun, Wang Youyuan, et al.Quanti- tative evaluation of ageing condition of oil-paper insulation using frequency domain characteristic extracted from modified cole-cole model[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2015, 22(5): 2694-2702. [12] Cowley R A, Coombs G J, Katiyar R S, et al.Dielectric response in piezoelectric crystals[J]. Journal of Physics C: Solid State Physics, 1971, 4(10): L203. [13] Siegbahn P E M. Models for the description of the H3O+ and OH- ions in water[J]. Journal of Com- putational Chemistry, 2015, 17(9): 1099-1107. [14] Saha T K, Purkait P, Muller F.Deriving an equivalent circuit of transformers insulation for understanding the dielectric response measurement[J]. IEEE Transa- ctions on Power Delivery, 2005, 20(1): 149-157. [15] 魏建林, 王世强, 彭华东, 等. 变压器油纸绝缘的介电响应特性研究——加速热老化的介电谱[J]. 电工技术学报, 2012, 27(5): 56-62. Wei Jianlin, Wang Shiqiang, Peng Huadong, et al.Dielectric response characteristics of transformer oil paper insulation—accelerating the dielectric spectrum of thermal aging[J]. Transactions of China Electro- technical Society, 2012, 27(5): 56-62.
2019, Vol. 34 
