纸板含水率对油纸绝缘击穿特性的影响
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摘要
变压器作为电网中的核心设备之一,其可靠性直接决定电网的安全稳定运行。含水率作为变压器油运行时所需监测的重要指标,对变压器工作状态影响显著。为研究纸板含水率对油纸绝缘击穿特性的影响,制备出不同含水率的纸板试样,测试其介电参数随含水率的变化规律,通过仿真分析其对油纸复合绝缘电场分布的作用规律,并通过实验验证了上述因素对油纸绝缘击穿特性的影响。试验结果表明,随含水率的上升,浸油纸板的电阻率下降,介电常数上升,油纸复合绝缘中的电场分布向变压器油中转移,并最终导致油纸绝缘系统击穿电压降低。
As the core equipment in power grid, the reliability of transformers directly effects the safe and stable operation of the system. And the moisture content is a significant indicator need to be monitored in running of transformers, which have great influence on operating state of them. In order to study its influence on the breakdown characteristics of oil-paper insulation, the pressboard samples with different moisture content were prepared in laboratory. The changing rules of dielectric characteristics with moisture content were tested, its functional rules of electric field distribution were analyzed by simulation as well. Moreover, the influence of above factors on the breakdown characteristics was verified by experimental method. The measuring results show that the conductivity and relative permittivity rise with the increase of moisture content, which causes the transference of electric field distribution into oil in oil-paper insulation system, and finally leading the decrease of breakdown strength of oil-paper insulation system with high moisture content.
As the core equipment in power grid, the reliability of transformers directly effects the safe and stable operation of the system. And the moisture content is a significant indicator need to be monitored in running of transformers, which have great influence on operating state of them. In order to study its influence on the breakdown characteristics of oil-paper insulation, the pressboard samples with different moisture content were prepared in laboratory. The changing rules of dielectric characteristics with moisture content were tested, its functional rules of electric field distribution were analyzed by simulation as well. Moreover, the influence of above factors on the breakdown characteristics was verified by experimental method. The measuring results show that the conductivity and relative permittivity rise with the increase of moisture content, which causes the transference of electric field distribution into oil in oil-paper insulation system, and finally leading the decrease of breakdown strength of oil-paper insulation system with high moisture content.
引文
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[11] 陈庆国,王金龙,林林,等.运行条件对换流变压器油纸绝缘油流带电特性的影响[J].高电压技术,2018,44(12):3880-3887.CHEN Qingguo,WANG Jinlong,LIN Lin,et al.Influence of operation conditions on flow electrification characteristics of oil-paper insulation in converter transformer[J].High Voltage Engineering,2018,44(12):3880-3887.
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[13] 陈庆国,诸葛祥丽,刘贺千,等.采用纳米改性纸板的换流变压器出线装置电场分布[J].电机与控制学报,2016,20(1):29-34.CHEN Qingguo,ZHUGE Xiangli,LIU Heqian,et al.Electric field distribution of converter transformer barrier system using nano modified pressboard[J].Electric Machines and Control,2016,20(1):29-34.
[2] Prevost T A,Oommen T V.Cellulose insulation in oil-filled power transformers:Part I-history and development[J].IEEE Electrical Insulation Magazine,2006,22(1):28-35.
[3] 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.
[4] 尹建国.油纸绝缘热老化过程中水分转移规律及其对热老化特性的影响[D].重庆:重庆大学,2010:1-16.YIN Jianguo.Moisture transfer rule of oil-paper insulation and its impact on the ageing characteristics during thermal ageing process[D].Chongqing:Chongqing University,2010:1-16.
[5] 廖瑞金,尹建国,杨丽君,等.油纸绝缘热老化过程中含水量变化趋势及水分转移规律[J].高电压技术,2010,36(4):828-834.LIAO Ruijin,YIN Jianguo,YANG Lijun,et al.Moisture content variation and transfer of oil-paper insulation during thermal aging process[J].High Voltage Engineering,2010,36(4):828-834.
[6] 张大宁,白帆,牛朝滨,等.不同受潮类型下油纸绝缘套管的频域介电谱特性[J].中国电机工程学报,2018,38(16):4942-4950.ZHANG Daning,BAI Fan,NIU Chaobin,et al.Frequency domain spectroscopy characteristics of oil-paper insulated bushings under different damp types[J].Proceedings of the CSEE,2018,38(16):4942-4950.
[7] 杨丽君,高思航,高竣,等.油纸绝缘频域介电谱的修正Cole-Cole模型特征参量提取及水分含量评估方法[J].电工技术学报,2016,31(10):26-33.YANG Lijun,GAO Sihang,GAO Jun,et al.Characteristic parameters extracted from modified cole-cole model and moisture content assessment methods study on frequency-domain dielectric spectroscopy of oil-paper insulation[J].Transactions of China Electrotechnical Society,2016,31(10):26-33.
[8] 张明泽,刘骥,齐朋帅,等.基于介电响应技术的变压器油纸绝缘含水率数值评估方法[J].电工技术学报,2018,33(18):221-231.ZHANG Mingze,LIU Ji,QI Pengshuai,et al.Numerical evaluation method for moisture content of transformer oil-paper insulation based on dielectric response technique[J].Transactions of China Electrotechnical Society,2018,33(18):221-231.
[9] 王伟,周冰,徐剑峰,等.油纸绝缘系统中含高水分绝缘纸板的沿面爬电特性[J].高电压技术,2011,37(8):1924-1929.WANG Wei,ZHOU Bing,XU Jianfeng,et al.Creepage discharge performance of high moisture pressboard in oil-paper insulation system[J].High Voltage Engineering,2011,37(8):1924-1929.
[10] 刘青松,邓军,池明赫,等.水分对复合电场下油纸绝缘局部放电特性的影响[J].哈尔滨理工大学学报,2018,23(6):82-87.LIU Qingsong,DENG Jun,CHI Minghe,et al.Effect of moisture on PD characteristics of oil-paper insulationin complex electric field[J].Journal of Harbin University of Science and Technology,2018,23(6):82-87.
[11] 陈庆国,王金龙,林林,等.运行条件对换流变压器油纸绝缘油流带电特性的影响[J].高电压技术,2018,44(12):3880-3887.CHEN Qingguo,WANG Jinlong,LIN Lin,et al.Influence of operation conditions on flow electrification characteristics of oil-paper insulation in converter transformer[J].High Voltage Engineering,2018,44(12):3880-3887.
[12] 陈季丹,刘子玉.电介质物理学[M].北京:机械工业出版社.1982:53-233.CHEN Jidan,LIU Ziyu.Dielectric physics [M].Beijing:Machinery Industry Press,1982:53-233.
[13] 陈庆国,诸葛祥丽,刘贺千,等.采用纳米改性纸板的换流变压器出线装置电场分布[J].电机与控制学报,2016,20(1):29-34.CHEN Qingguo,ZHUGE Xiangli,LIU Heqian,et al.Electric field distribution of converter transformer barrier system using nano modified pressboard[J].Electric Machines and Control,2016,20(1):29-34.