基于频域介损积分谱分析变压器油纸绝缘状态的研究
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摘要
频域介电谱(FDS)与水分含量的映射关系能有效评估油纸绝缘状态,为了直接利用频域介电特征量评估绝缘老化和受潮的方法,提出在特征频域段内采用介损积分值作为绝缘状态评估的特征参量,并实验研究了不同绝缘老化和受潮程度对频域介电谱和频域介损积分谱影响及其变化规律。研究结果表明:在10~(-3)～10~2Hz范围内相对于频域介损,频域介损积分谱对油纸绝缘老化和受潮更为敏感,随着油纸绝缘老化程度和绝缘受潮的增大,介损积分均呈上升趋势,且曲线具有饱和值,该介损积分值可以量化评估油纸绝缘的状态;与绝缘老化相比,在10~(-3)～10~2Hz范围内,频域介损积分值对绝缘纸的受潮更为敏感,其频域介损积分值更大。因此,提出的频域介损积分谱法为量化评估变压器绝缘状态提供新的研究思路。
The state of oil-paper insulation can be effectively assessed by the mapping relationship between the frequency domain spectrum and the moisture content. In order to directly use frequency domain dielectric characteristics to assesse insulation aging and dampness, the dielectric loss integral value was proposed as the characteristic parameter of insulation condition assessment in characteristic frequency domain. The effects of different insulation aging and dampness on dielectric spectrum in frequency domain and dielectric loss integral spectrum in frequency domain and its variation law were studied experimentally.Results show that in 10~(-3)～10~2 Hz, the frequency domain spectrum of S_(tanδ) than the frequency domain spectrum of tanδ is more sensitive in the change of aging state and moisture content, with the increase of aging degree and moisture content of oil-paper insulation, the dielectric loss integral tends to increase, and the curve has saturation value, which can quantitatively evaluate the state of oil-paper insulation. Compared with insulation aging, the dielectric loss integral value in frequency domain is more sensitive to moisture content of insulating paper in the range of 10~(-3)～10~2 Hz, and its dielectric loss integral value in frequency domain is larger. Therefore, the proposed frequency domain dielectric loss integral spectrum method provides a new research idea for quantitative evaluation of transformer insulation state.
The state of oil-paper insulation can be effectively assessed by the mapping relationship between the frequency domain spectrum and the moisture content. In order to directly use frequency domain dielectric characteristics to assesse insulation aging and dampness, the dielectric loss integral value was proposed as the characteristic parameter of insulation condition assessment in characteristic frequency domain. The effects of different insulation aging and dampness on dielectric spectrum in frequency domain and dielectric loss integral spectrum in frequency domain and its variation law were studied experimentally.Results show that in 10~(-3)～10~2 Hz, the frequency domain spectrum of S_(tanδ) than the frequency domain spectrum of tanδ is more sensitive in the change of aging state and moisture content, with the increase of aging degree and moisture content of oil-paper insulation, the dielectric loss integral tends to increase, and the curve has saturation value, which can quantitatively evaluate the state of oil-paper insulation. Compared with insulation aging, the dielectric loss integral value in frequency domain is more sensitive to moisture content of insulating paper in the range of 10~(-3)～10~2 Hz, and its dielectric loss integral value in frequency domain is larger. Therefore, the proposed frequency domain dielectric loss integral spectrum method provides a new research idea for quantitative evaluation of transformer insulation state.
引文
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[15] 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):9002405
[16] 刘骥,吕佳璐,张明泽,等.基于介电响应的油纸绝缘寿命预测方法[J/OL].电机与控制学报:1-8[2019-04-23].http://kns.cnki.net/kcms/detail/23.1408.tm.20190307.1546.002.html.LIU Ji,Lü Jialu,ZHANG Mingze,et al.Dielectric spectroscopy and characteristic parameters of transformer oil-paper insulation aging[J/OL].Electric Machines and Control:1-8[2019-04-23].http://kns.cnki.net/kcms/detail/23.1408.tm.20190307.1546.002.html.
[17] 张大宁,刘孝为,等.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(04):847.ZHANG Daning,LIU Xiaowei,et al.Analysis of imaginary part of frequency domain spectroscopy for oil-paper insulation transformer[J].Transactions of China Electrotechnical Society,2019,34(04):847.
[18] 周利军,李会泽,王安,等.纤维素老化对矿物油浸绝缘纸中水分扩散的影响[J].电工技术学报,2019,34(07):1536.ZHOU Lijun,LI Huize,WANG An,et al.Effects of cellulose ageing on moisture diffusion in paper immersed with mineral oil[J].Transactions of China Electrotechnical Society,2019,34(07):1536.
[19] 刘骥,赵明云,张明泽,等.变压器油纸绝缘老化介电谱特性及特征量研究[J].电机与控制学报,2018,22(11):67.LIU Ji,ZHAO Mingyun,ZHANG Mingze,et al.Dielectric spectroscopy and characteristic parameters of transformer oil-paper insulation aging[J].Electric Machines and Control,2018,22(11):67.
[2] LUNDGRAARD 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.
[3] 王世强,魏建林,杨双锁,等.油纸绝缘加速热老化的频域介电谱特性[J].中国电机工程学报,2010,30(34):125.WANG Shiqiang,WEI Jianlin,YANG Shuangsuo,et al.Frequency domain dielectric spectroscopy characteristics of oil-paper insulation under accelerated thermal aging[J].Proceeding of the CSEE,2010,27(34):125.
[4] GUBANSKI S M,BOSS P,CSEPESET G et al.Dielectric response methods for diagnostics of power transformers[J].Electrical Insulation Magazine,IEEE 2003:12.
[5] 张涛,蔡金锭.应用极化谱分析油纸变压器绝缘纸板水分含量的研究[J].电工电能新技术,2009,28(4):46.ZHANG Tao,CAI Jinding.Application of polarization spectral to analyze moisture content of oil-paper pressboard [J].Advanced Technology of Electrical Engineering and Energy,2009,28(4):46.
[6] 张涛,左倩,任乔林,等.油纸绝缘非标准极化谱的中心时间常数提取[J].电机与控制学报,2018,22(08):82.ZHANG Tao,ZUO Qian,REN Qiaolin,et al.Central time constant of nonstandard polarization spectrum of oil-paper insulation[J].Electric Machines and Control,2018,22(08):82.
[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)
[8] POOVAMMA P K,SUDHINDRA A,MALLIKARJUNAPPA K.Evaluation of transformer insulation by frequency domain technique[C]//2007 International Conference on Solid Dielectrics,Winchester,UK,2007:681.
[9] LINHJEL D,LUNDGAARD L,GAFVERT U.Dielectric response of mineral oil impregnated cellulose and the impact of aging[J].IEEE Transactions on Dielectrics and Electrical Insulation,2007,14(1):156.
[10] 廖瑞金,刘捷丰,吕彦冬,等.变压器油纸绝缘含水量定量评估的频域介电特征参量研究[J].电工技术学报,2015,30(1):204.LIAO Ruijin,LIU Jiefeng,Lü Yandong,et al.Frequency domain dielectric characteristic parameters for quantitative assessment of moisture content of oil-paper insulationpower transformers[J].Transactions of China Electrotechnical Society,2015,30(1):205.
[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.DONG Ming,LIU Yuan,REN Ming.Explanation study of frequency-domain dielectric spectroscopy for oil-paper insulation system[J].Proceedings of the CSEE,2015,35(4):1002.
[12] 张涛,蔡金锭.油纸绝缘变压器介质响应电路参数辨识的研究[J].电工电能新技术,2010,29(4):35.ZHANG Tao,CAI Jinding.Research on parameters identification for dielectric response equivalent circuit of transformers with oil-paper insulation[J].Advanced Technology of Electrical Engineering and Energy,2010,20(4):35.
[13] 贺德华,蔡金锭,黄云程.基于等效电路参数特征量的优质绝缘老化状态评估[J].电机与控制学报,2017,21(6):44.HE Dehua,CAI Jinding,HUANG Yuncheng.Study on insulation condition of power transformer based on the equivalent circuit characteristic parameters [J].Electric Machines and Control,2017,21(6):44.
[14] 林智勇,蔡金锭.油纸绝缘极化等效电路参数计算方法[J].电机与控制学报,2014,18(8):62.LIN Zhiyong,CAI Jinding.Novel method to calculate polarized equivalent circuit of oil-paper insulation [J].Electric Machines and Control,2014,18(8):62.
[15] 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):9002405
[16] 刘骥,吕佳璐,张明泽,等.基于介电响应的油纸绝缘寿命预测方法[J/OL].电机与控制学报:1-8[2019-04-23].http://kns.cnki.net/kcms/detail/23.1408.tm.20190307.1546.002.html.LIU Ji,Lü Jialu,ZHANG Mingze,et al.Dielectric spectroscopy and characteristic parameters of transformer oil-paper insulation aging[J/OL].Electric Machines and Control:1-8[2019-04-23].http://kns.cnki.net/kcms/detail/23.1408.tm.20190307.1546.002.html.
[17] 张大宁,刘孝为,等.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(04):847.ZHANG Daning,LIU Xiaowei,et al.Analysis of imaginary part of frequency domain spectroscopy for oil-paper insulation transformer[J].Transactions of China Electrotechnical Society,2019,34(04):847.
[18] 周利军,李会泽,王安,等.纤维素老化对矿物油浸绝缘纸中水分扩散的影响[J].电工技术学报,2019,34(07):1536.ZHOU Lijun,LI Huize,WANG An,et al.Effects of cellulose ageing on moisture diffusion in paper immersed with mineral oil[J].Transactions of China Electrotechnical Society,2019,34(07):1536.
[19] 刘骥,赵明云,张明泽,等.变压器油纸绝缘老化介电谱特性及特征量研究[J].电机与控制学报,2018,22(11):67.LIU Ji,ZHAO Mingyun,ZHANG Mingze,et al.Dielectric spectroscopy and characteristic parameters of transformer oil-paper insulation aging[J].Electric Machines and Control,2018,22(11):67.
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