复合电压作用下变压器油的低温击穿特性
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摘要
为研究低温下含水率对变压器油复合电场击穿特性的影响,在实验室搭建低温试验系统,在-40～20℃温度区间内对不同含水率的变压器油在复合电场作用下进行击穿试验。研究结果表明,复合电场下随着温度的降低,低含水率变压器油的击穿场强逐渐增大,高含水率变压器油的击穿场强先减小后增大,极小值分布在-10～0℃温度区间内;-10～20℃温度区间,变压器油含水率的增大使其击穿场强显著降低,同时高含水率变压器油击穿场强的极小值所对应温度向高温方向移动;不同含水率的变压器油击穿场强随直流分量的增大而减小,含水率的增加减小了直流分量对击穿强度的影响。
In order to study the influences of moisture and compound electric field on breakdown characteristics of transformer oil at low temperatures, we established an experimental system which could run at low temperatures and carried out breakdown experiments of transformer oil with different moisture under compound electric field between-40 ℃and 20 ℃. The results show that with the temperature decreasing, the breakdown strength of low moisture transformer oil increases, however, the breakdown strength of high moisture transformer oil first decreases and then increases under a compound electric field, and the minimums will distribute between-10 ℃ and 0 ℃. The breakdown strength of transformer oil significantly reduces with the enhancement of moisture between-10 ℃ and 20 ℃, and the temperature according to minimum breakdown strength of high moisture transformer oil moves to the high temperature direction. The breakdown strength of different moisture transformer oil decreases with the increasing of DC content. The increase of moisture weakens the influences of DC content to breakdown strength.
In order to study the influences of moisture and compound electric field on breakdown characteristics of transformer oil at low temperatures, we established an experimental system which could run at low temperatures and carried out breakdown experiments of transformer oil with different moisture under compound electric field between-40 ℃and 20 ℃. The results show that with the temperature decreasing, the breakdown strength of low moisture transformer oil increases, however, the breakdown strength of high moisture transformer oil first decreases and then increases under a compound electric field, and the minimums will distribute between-10 ℃ and 0 ℃. The breakdown strength of transformer oil significantly reduces with the enhancement of moisture between-10 ℃ and 20 ℃, and the temperature according to minimum breakdown strength of high moisture transformer oil moves to the high temperature direction. The breakdown strength of different moisture transformer oil decreases with the increasing of DC content. The increase of moisture weakens the influences of DC content to breakdown strength.
引文
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[10]陈庆国,池明赫,高源,等.复合电场下油纸(板)绝缘击穿特性及其数学模型[J].中国电机工程学报,2013,33(31):170-175.CHEN Qingguo,CHI Minghe,GAO Yuan,et al.Breakdown characterrisics and its mathematical model of oil-pressboard insulation under compound electric field[J].Proceedings of the CSEE,2013,33(31):170-175.
[11]陈庆国,池明赫,王刚,等.含水率对复合电场下油纸绝缘电场分布的影响[J].电机与控制学报,2013,17(7):54-60.CHEN Qingguo,CHI Minghe,WANG Gang,et al.Moisture influence on the electric field distribution of oil-pressboard insulation under compound electric field[J].Electric Machines and Control,2013,17(7):54-60.
[12]池明赫,陈庆国,王新宇,等.温度对复合电压下油纸绝缘电场分布的影响[J].中国电机工程学报,2015,35(6):1524-1532.CHI Minghe,CHEN Qingguo,WANG Xinyu,et al.Influence of temperaue on electric field distribution of oil-paper insulation undercompound voltage[J].Proceedings of the CSEE,2015,35(6):1524-1532.
[13]王永红,魏新劳,朱宝森,等.极性反转电压下变压器油的击穿特性[J].电机与控制学报,2011,15(3):46-51.WANG Yonghong,WEI Xinlao,ZHU Baosen,et al.Breakdown characteristics of transformer oil at DC polarity reversal voltage[J].Electric Machines and Control,2011,15(3):46-51.
[14]KRAUSE C,BRUPBACHER P,FEHLMANN A,et al.Moisture effects on the electric strength of oil/pressboard insulation used in power transformers[C]∥IEEE International Conference on Dielectric Liquids.[S.l.]:IEEE,2005:369-372.
[15]KRINS M,BORSI H,GOCKENBACH E.Impact of different water contents on the electrical strength of oil gaps and solid/liquid interfaces in the presence of carbon particles[C]∥Proceedings of the 1999IEEE 13th International Conference on Dielectric Liquids.[S.l.]:IEEE,1999:281-285.
[16]ZUKOWSKI P,POLAND L,KOLTUNOWICZ T N,et al.Assessment of water content in an impregnated pressboard based on DC conductivity measurements theoretical assumptions[J].IEEE Transactions on Dielectrics and Electrical Insulation,2014,21(3):1268-1275.
[17]BANDARA K,SAHA T K,EKANAYAKE C.Influence of moisture and ageing on dielectric response of ester and mineral oil impregnated pressboard insulation[C]∥Power and Energy Engineering Conference.[S.l.]:IEEE,2015:1-5.
[18]DAI J,WANG Z D,JARMAN P.Moisture and aging effect on the creepage discharge characteristics at the oil/transformer-board interface under divergent field[C]∥Annual Report Conference on Electrical Insulation and Dielectric Phenomena.Quebec,Canada:IEEE,2008:662-665.
[19]CUI Y,MA H,SAHA T,et al.Understanding moisture dynamics and its effect on the dielectric response of transformer insulation[J].IEEETransactions on Power Delivery,2015,30(5):2195-2204.
[20]EBISAWA Y,YAMADA S,MORI S,et al.DC creepage breakdown characteristics of oil-immersed insulation[J].IEEE Transactions on Dielectrics and Electrical Insulation,2009,16(6):1686-1692.
[21]BUTCHER M,NEUBER A A,CEVALLOS M D,et al.Conduction and breakdown mechanisms in transformer oil[J].IEEE Transactions on Plasma Science,2006,34(2):467-475.
[22]RAGHUVEER M R,KOLACZKOWSHI Z,JIN W F,et al.Surface electric strength of processed pressboard under composite AC and DCand conventional stresses[J].IEEE Transactions on Electrical Insulation,1990,25(2):341-350.
[23]王晓剑,王娟,石颉,等.油纸绝缘老化产物对油中水分饱和溶解度的影响[J].绝缘材料,2015(8):46-50.WANG Xiaojian,WANG Juan,SHI Jie,et al.Influence of ageing prod-ucts of oil-paper insulation on water saturation solubility in oil[J].Insulating Materials,2015(8):46-50.
[24]郭冲.换流变压器油纸绝缘低温击穿特性[D].哈尔滨:哈尔滨理工大学,2018:61-62.GUO Chong.The breakdown characteristics of oil-paper insulation for converter transformer under low temperature[D].Harbin,China:Harbin University of Science and Technology,2018:61-62.
[2]徐政.“±1 100 k V特高压直流输电技术和应用”专题特约主编寄语[J].高电压技术,2017,43(10):3137-3138.XU Zheng.Special section on±1 100kV UHVDC transmission technology and application the guest editor’s letter[J].High Voltage Engineering,2017,43(10):3137-3138.
[3]李鹏,谷琛,陈东,等.±1 500 k V特高压直流输电技术前期研究[J].高电压技术,2017,43(10):3139-3148.LI Peng,GU Chen,CHEN Dong,et al.Development of technologies in±1 500kV UHVDC transmission research[J].High Voltage Engineering,2017,43(10):3139-3148.
[4]王加龙,彭宗仁,刘鹏,等.±1 100 k V特高压换流站阀厅均压屏蔽金具表面电场分析[J].高电压技术,2015,41(11):3728-3736.WANG Jialong,PENG Zongren,LIU Peng,et al.Analysis of electric field on the surfaces of grading and shielding fittings inside±1 100kVultra-high voltage converter valve hall[J].High Voltage Engineering,2015,41(11):3728-3736.
[5]廖瑞金,王季宇,袁媛,等.换流变压器下新型纤维素绝缘纸特性综述[J].电工技术学报,2016,31(10):1-15.LIAO Ruijin,WANG Jiyu,YUAN Yuan,et al.Review on the character-istic of new cellulose insulation paper used in the converter transformer[J].Transactions of China Electrotechnical Society,2016,31(10):1-15.
[6]陈庆国,侯帅,池明赫,等.换流变压器出线装置电场分布与绝缘结构优化[J].高电压技术,2013,39(12):2859-2868.CHEN Qingguo,HOU Shuai,CHI Minghe,et al.Electric field distribution in converter transformer outlet device and its insulation structue optimization[J].High Voltage Engineering,2013,39(12):2859-2868.
[7]金福宝,周远翔,黄建文,等.温度对交直流复合电场下油纸绝缘沿面放电特性的影响[J].高电压技术,2017,43(3):931-939.JIN Fubao,ZHOU Yuanxiang,HUANG Jianwen,et al.Effects of teperature on creepage discharge characteristics of paper-oil insluation under combined AC-DC voltage[J].High Voltage Engineering,2017,43(3):931-939.
[8]徐征宇,程涣超,汪可,等.高寒条件下变压器油击穿特性试验[J].高电压技术,2015,41(4):1342-1348.XU Zhengyu,CHENG Huanchao,WANG Ke,et al.Experimental research on breakdown characteristics of transformer oil at extremely low temperature[J].High Voltage Engineering,2015,41(4):1342-1348.
[9]高明.低温下变压器油绝缘特性研究[D].北京:中国电力科学研究院,2011:61-62.GAO Ming.Study on insulation characteristics of transformer oil at low temperatures[D].Beijing,China:China Electric Power Research Institute,2011:61-62.
[10]陈庆国,池明赫,高源,等.复合电场下油纸(板)绝缘击穿特性及其数学模型[J].中国电机工程学报,2013,33(31):170-175.CHEN Qingguo,CHI Minghe,GAO Yuan,et al.Breakdown characterrisics and its mathematical model of oil-pressboard insulation under compound electric field[J].Proceedings of the CSEE,2013,33(31):170-175.
[11]陈庆国,池明赫,王刚,等.含水率对复合电场下油纸绝缘电场分布的影响[J].电机与控制学报,2013,17(7):54-60.CHEN Qingguo,CHI Minghe,WANG Gang,et al.Moisture influence on the electric field distribution of oil-pressboard insulation under compound electric field[J].Electric Machines and Control,2013,17(7):54-60.
[12]池明赫,陈庆国,王新宇,等.温度对复合电压下油纸绝缘电场分布的影响[J].中国电机工程学报,2015,35(6):1524-1532.CHI Minghe,CHEN Qingguo,WANG Xinyu,et al.Influence of temperaue on electric field distribution of oil-paper insulation undercompound voltage[J].Proceedings of the CSEE,2015,35(6):1524-1532.
[13]王永红,魏新劳,朱宝森,等.极性反转电压下变压器油的击穿特性[J].电机与控制学报,2011,15(3):46-51.WANG Yonghong,WEI Xinlao,ZHU Baosen,et al.Breakdown characteristics of transformer oil at DC polarity reversal voltage[J].Electric Machines and Control,2011,15(3):46-51.
[14]KRAUSE C,BRUPBACHER P,FEHLMANN A,et al.Moisture effects on the electric strength of oil/pressboard insulation used in power transformers[C]∥IEEE International Conference on Dielectric Liquids.[S.l.]:IEEE,2005:369-372.
[15]KRINS M,BORSI H,GOCKENBACH E.Impact of different water contents on the electrical strength of oil gaps and solid/liquid interfaces in the presence of carbon particles[C]∥Proceedings of the 1999IEEE 13th International Conference on Dielectric Liquids.[S.l.]:IEEE,1999:281-285.
[16]ZUKOWSKI P,POLAND L,KOLTUNOWICZ T N,et al.Assessment of water content in an impregnated pressboard based on DC conductivity measurements theoretical assumptions[J].IEEE Transactions on Dielectrics and Electrical Insulation,2014,21(3):1268-1275.
[17]BANDARA K,SAHA T K,EKANAYAKE C.Influence of moisture and ageing on dielectric response of ester and mineral oil impregnated pressboard insulation[C]∥Power and Energy Engineering Conference.[S.l.]:IEEE,2015:1-5.
[18]DAI J,WANG Z D,JARMAN P.Moisture and aging effect on the creepage discharge characteristics at the oil/transformer-board interface under divergent field[C]∥Annual Report Conference on Electrical Insulation and Dielectric Phenomena.Quebec,Canada:IEEE,2008:662-665.
[19]CUI Y,MA H,SAHA T,et al.Understanding moisture dynamics and its effect on the dielectric response of transformer insulation[J].IEEETransactions on Power Delivery,2015,30(5):2195-2204.
[20]EBISAWA Y,YAMADA S,MORI S,et al.DC creepage breakdown characteristics of oil-immersed insulation[J].IEEE Transactions on Dielectrics and Electrical Insulation,2009,16(6):1686-1692.
[21]BUTCHER M,NEUBER A A,CEVALLOS M D,et al.Conduction and breakdown mechanisms in transformer oil[J].IEEE Transactions on Plasma Science,2006,34(2):467-475.
[22]RAGHUVEER M R,KOLACZKOWSHI Z,JIN W F,et al.Surface electric strength of processed pressboard under composite AC and DCand conventional stresses[J].IEEE Transactions on Electrical Insulation,1990,25(2):341-350.
[23]王晓剑,王娟,石颉,等.油纸绝缘老化产物对油中水分饱和溶解度的影响[J].绝缘材料,2015(8):46-50.WANG Xiaojian,WANG Juan,SHI Jie,et al.Influence of ageing prod-ucts of oil-paper insulation on water saturation solubility in oil[J].Insulating Materials,2015(8):46-50.
[24]郭冲.换流变压器油纸绝缘低温击穿特性[D].哈尔滨:哈尔滨理工大学,2018:61-62.GUO Chong.The breakdown characteristics of oil-paper insulation for converter transformer under low temperature[D].Harbin,China:Harbin University of Science and Technology,2018:61-62.
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