评估变压器油纸绝缘受潮的电压响应方法研究
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摘要
回复电压法能有效诊断变压器油纸绝缘的状态,但测量时间过长,由此提出通过单次加压建立的极化在不同去极化时间段内的电压响应特性进行绝缘诊断的方法,省去多次加压的过程,节省了测量时间;实验研究了不同受潮状态的变压器油纸绝缘介质在不同去极化时间段的电压响应特性,结果表明,充电2 000 s后首次放电0. 1 s的电压响应初始斜率随绝缘受潮程度的增加而增大,可作为评估其受潮状态的特征量;同时通过频域分析仪测得介质的直流电导率,将其与根据首次放电初始斜率计算获得的极化电导率进行对比分析,进一步验证了该特征量的有效性。文中提出的测量方法为应用电压响应法现场快速诊断变压器油纸绝缘的受潮状态提供了一种新的研究思路。
The recovery voltage measurement method can effectively evaluate the state of transformer oil-paper insulation,but the measurement time is too long. Thus,this paper presents a method to diagnose the insulation state by the voltage response characteristics of the polarization established at one polarization time and released in different depolarization periods,which eliminates the need for multiple voltage applications,and saves the time of measurement. The characteristics of response voltage in different depolarization periods of transformer oil-paper insulation under different moisture conditions were experimentally studied. The results show that the initial slope of the voltage response obtained by the first discharge 0. 1 s after charging 2 000 s increases with the increase of the moisture content of the insulation,which can be used as a feature to evaluate the moisture condition of the insulation. Meanwhile,the DC conductivity of the medium was measured by the frequency domain analyzer and compared with the polarization conductivity calculated from the initial slope of the first discharge to further prove the validity of the feature. This measurement method provides a new research idea for the use of response voltage measurement to quickly diagnose the moisture status of transformer oil-paper insulation.
The recovery voltage measurement method can effectively evaluate the state of transformer oil-paper insulation,but the measurement time is too long. Thus,this paper presents a method to diagnose the insulation state by the voltage response characteristics of the polarization established at one polarization time and released in different depolarization periods,which eliminates the need for multiple voltage applications,and saves the time of measurement. The characteristics of response voltage in different depolarization periods of transformer oil-paper insulation under different moisture conditions were experimentally studied. The results show that the initial slope of the voltage response obtained by the first discharge 0. 1 s after charging 2 000 s increases with the increase of the moisture content of the insulation,which can be used as a feature to evaluate the moisture condition of the insulation. Meanwhile,the DC conductivity of the medium was measured by the frequency domain analyzer and compared with the polarization conductivity calculated from the initial slope of the first discharge to further prove the validity of the feature. This measurement method provides a new research idea for the use of response voltage measurement to quickly diagnose the moisture status of transformer oil-paper insulation.
引文
[1]廖瑞金,孙会刚,袁泉,等.采用回复电压法分析油纸绝缘老化特征量[J].高电压技术,2011,37(1):136-142.Liao Ruijin,Sun Huigang,Yuan Quan,et al.Analysis of oil-paper insulation aging characteristics using recovery voltage method[J].High Voltage Engineering,2011,37(1):136-142.
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[3]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):46-49.Zhang Tao,Cai Jinding.Research on moisture content analysis of insulation pressboard in oil-paper transformer using polarization spectrum[J].Advanced Technology of Electrical Engineering and Energy,2009,28(4):46-49.
[4]Yao ZT,Saha TK.Voltage response measurements for power transformer moisture and ageing condition assessment[C]//Transmission and Distribution Conference and Exhibition 2002:Asia Pacific.IEEE/PES.IEEE,2002,1:307-312.
[5]Saha TK,Purkait P.Understanding the impacts of moisture and thermal ageing on transformer's insulation by dielectric response and molecular weight measurements[J].IEEE Transactions on Dielectrics and Electrical Insulation,2008,15(2):568-582.
[6]Hassanl O,Borsil H,Gockenbach E,et al.Diagnostic of insulation condition of oil impregnated paper insulation system with return voltage measurements[C]//2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena.[S.1.]:[s.n.],2003:153-156.
[7]Nemeth E.Measuring voltage response:a non-destructive diagnostic test method of HV insulation[J].IEE Proceedings-Science,Measurement and Technology,1999,146(5):249-252.
[8]Zhang T,Tan X,Zhang B,et al.Study on Moisture and Aging of OilPaper Insulation Using Relative Initial Slope of Recovery Voltage[J].IEEE Transactions on Applied Superconductivity,2016,26(7):1-4.
[9]Tamus Z A,Berta I.Application of voltage response measurement on low voltage cables[C]//2009 IEEE Electrical Insulation Conference,Montreal,QC,2009:444-447.
[10]Tamus Z A,Szedenik N.Investigation of temperature dependence of dielectric processes in thermally aged PVC insulation[J].Journal of Electrostatics,2013,71(3):462-466.
[11]Csányi G M,Tamus Z A.Investigation of dielectric properties of mixed PILC and XLPE cable insulation by the extended Voltage Response Method[C]//International Youth Conference on Energy,2017:1-4.
[12]孙目珍.电介质物理基础[M].广州:华南理工大学出版社,2000.
[2]江修波,黄彦婕,张涛.变压器油纸绝缘水分的回复电压分析法[J].高电压技术,2010,36(12):2984-2989.Jiang Xiubo,Huang Yanjie,Zhang Tao.Return voltage method of moisture of oil-paper insulation in power transformer[J].High Voltage Engineering,2010,36(12):2984-2989.
[3]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):46-49.Zhang Tao,Cai Jinding.Research on moisture content analysis of insulation pressboard in oil-paper transformer using polarization spectrum[J].Advanced Technology of Electrical Engineering and Energy,2009,28(4):46-49.
[4]Yao ZT,Saha TK.Voltage response measurements for power transformer moisture and ageing condition assessment[C]//Transmission and Distribution Conference and Exhibition 2002:Asia Pacific.IEEE/PES.IEEE,2002,1:307-312.
[5]Saha TK,Purkait P.Understanding the impacts of moisture and thermal ageing on transformer's insulation by dielectric response and molecular weight measurements[J].IEEE Transactions on Dielectrics and Electrical Insulation,2008,15(2):568-582.
[6]Hassanl O,Borsil H,Gockenbach E,et al.Diagnostic of insulation condition of oil impregnated paper insulation system with return voltage measurements[C]//2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena.[S.1.]:[s.n.],2003:153-156.
[7]Nemeth E.Measuring voltage response:a non-destructive diagnostic test method of HV insulation[J].IEE Proceedings-Science,Measurement and Technology,1999,146(5):249-252.
[8]Zhang T,Tan X,Zhang B,et al.Study on Moisture and Aging of OilPaper Insulation Using Relative Initial Slope of Recovery Voltage[J].IEEE Transactions on Applied Superconductivity,2016,26(7):1-4.
[9]Tamus Z A,Berta I.Application of voltage response measurement on low voltage cables[C]//2009 IEEE Electrical Insulation Conference,Montreal,QC,2009:444-447.
[10]Tamus Z A,Szedenik N.Investigation of temperature dependence of dielectric processes in thermally aged PVC insulation[J].Journal of Electrostatics,2013,71(3):462-466.
[11]Csányi G M,Tamus Z A.Investigation of dielectric properties of mixed PILC and XLPE cable insulation by the extended Voltage Response Method[C]//International Youth Conference on Energy,2017:1-4.
[12]孙目珍.电介质物理基础[M].广州:华南理工大学出版社,2000.