基于功角特性的干式空心电抗器匝间绝缘在线监测技术
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摘要
干式空心电抗器在长期运行中由于绝缘老化而故障频发,其中匝间短路故障率最高。建立电抗器匝间短路故障等效电路模型,分析了匝间绝缘短路故障引起的电抗器功角变化特性,基于此提出一种基于功角特性的干式空心电抗器匝间绝缘在线监测技术。采用改进中值滤波算法对原始数据进行去噪处理,通过修正理想采样频率法消除了非整周期采样带来的采样误差,利用谐波分析法获取电抗器的功率因数角。试验结果表明,所提技术可以实现对电抗器的少匝匝间绝缘短路故障的有效监测。
Dry-type air-core reactors have frequent faults in long-term operation due to insulation aging,among which the inter-turn short circuit fault rate is the highest. The equivalent circuit model of reactor inter-turn short circuit fault is established,and the characteristics of reactor power angle variation caused by inter-turn insulation short circuit fault are analyzed,based on which,an online inter-turn insulation monitoring technology based on power angle characteristics for dry-type air-core reactor is proposed. The improved median filter algorithm is used to denoise the original data,the sampling error caused by non-integer period sampling is eliminated by correcting the ideal sampling frequency method. The power factor angle of reactor is obtained by harmonic analysis. The test results show that the less-coil inter-turn insulation fault of the reactor can be effectively monitored by the proposed technology.
Dry-type air-core reactors have frequent faults in long-term operation due to insulation aging,among which the inter-turn short circuit fault rate is the highest. The equivalent circuit model of reactor inter-turn short circuit fault is established,and the characteristics of reactor power angle variation caused by inter-turn insulation short circuit fault are analyzed,based on which,an online inter-turn insulation monitoring technology based on power angle characteristics for dry-type air-core reactor is proposed. The improved median filter algorithm is used to denoise the original data,the sampling error caused by non-integer period sampling is eliminated by correcting the ideal sampling frequency method. The power factor angle of reactor is obtained by harmonic analysis. The test results show that the less-coil inter-turn insulation fault of the reactor can be effectively monitored by the proposed technology.
引文
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[14]BLASKO V,KAURA V. New mathematical model and control of a three-phase AC-DC voltage source converter[J]. IEEE Transactions on Power Electronics,2008,12(l):116-121.
[15]HUANG Xinbo,LI Hongbo,ZHU Yongcan. A short-term ice accretion forecasting model for transmission lines with modified time series analysis by fireworks algorithm[J]. IET Generation,Transmission&Distribution,2018,12(5):1074-1080.
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[17]吴彦霖,谭向宇,马仪,等.电场分布以及匝数偏差暂态电动力对干式空心并联电抗器影响的研究[J].高压电器,2016,52(10):99-107.WU Yanlin,TAN Xiangyu,MA Yi,et al. Study of the influence of electric field distribution and turns deviation transient electrodynamic force on dry-type air-core shunt reactor[J]. High Voltage Apparatus,2016,52(10):99-107.
[18]冯小华,吴正茂,张承学.介损在线监测的3种改进谐波分析法的分析[J].高压电器,2005,41(1):4-5,9.FENG Xiaohua,WU Zhengmao,ZHANG Chengxue. Analysis of three modified algorithms for online measurement of tanδ[J]. High Voltage Apparatus,2005,41(1):4-5,9.
[2]黄新波.变电设备在线监测与故障诊断[M].北京:中国电力出版社,2010:32-35.
[3]黄文武,凌云,吴玉坤,等.干式空心电抗器匝间短路故障特性的研究[J].变压器,2017,54(10):14-18.HUANG Wenwu,LING Yun,WU Yukun,et al. Research on interturn short circuit fault characteristics of dry-type air-core reactor[J].Transformer,2017,54(10):14-18.
[4]王卓,黄新波,邓凸,等.变压器套管介质损耗在线监测装置[J].广东电力,2013,26(4):72-76.WANG Zhuo,HUANG Xinbo,DENG Tu,et al. On-line monitoring device for dielectric loss of transformer casing[J]. Guangdong Electric Power,2013,26(4):72-76.
[5]李赢,杨松伟,章建欢,等.基于分布式光纤测温的干式空心电抗器温升监测方法的研究[J].仪表技术与传感器,2017(2):43-46,50.LI Ying,YANG Songwei,ZHANG Jianhuan,et al. Study of temperature monitoring method of dry-type air-core reactor based on distributed optical fiber[J]. Instrument Technique and Sensor,2017(2):43-46,50.
[6]王晓文,刘宇博.基于探测线圈法的干式并联电抗器故障监测研究[J].沈阳工程学院学报(自然科学版),2016,12(4):336-339.WANG Xiaowen,LIU Yubo. The study based on detecting coil for dry-type shunt reactors fault detection[J]. Shenyang Institute of Engineering(Natural Science),2016,12(4):336-339.
[7]钱勇,黄成军,江秀臣,等.基于超高频法的GIS局部放电在线监测研究现状及展望[J].电网技术,2005,29(1):40-43,55.QIAN Yong,HUANG Chengjun,JIANG Xiuchen,et al. Present situation and prospect of ultrahigh frequency method based research of on-line monitoring of partial discharge in gas insulated switchgear[J]. Power System Technology,2005,29(1):40-43,55.
[8]刘创华,刘梅.干式空心电抗器匝间绝缘检测技术[J].电力系统及其自动化学报,2016,28(增刊):115-118.LIU Chuanghua,LIU Mei. Detection technology of the interturn insulation of dry-type air-core reactor[J]. Proceedings of the CSUEPSA,2016,28(Supplement):115-118.
[9]王梓,刘溟,邹建明,等.基于TVOC检测的干式空心电抗器过热故障诊断方法[J].高电压技术,2017,43(11):3756-3762.WANG Zi,LIU Ming,ZOU Jianming,et al. Diagnostic method of dry-type air-core reactorsoverheating fault based on monitoring TVOC[J]. High Voltage Engineering,2017,43(11):3756-3762.
[10]赵春明,朱大铭,司昌健,等.匝间短路干式空心并联电抗器故障电流分析[J].变压器,2017,54(9):34-38.ZHAO Chunming,ZHU Daming,SI Changjian,et al. Analysis of currents in dry-type air-core shunt reactor with turn-to-turn shortcircuit fault[J] Transformer,2017,54(9):34-38.
[11]ZHANG Bin,HUANG Wenwu,LING Yun,et al. Simulation on transient characteristics of inter-turn short circuit fault of dry-type aircore reactor based on ANSYS Maxwell[C]∥International Conference on Electrical Engineering and Automation Control(ICEEAC2017). Nanjing,China:[s.n.],2017:416-422.
[12]毕大强,王祥珩,王维俭.基于测量阻抗变化的并联电抗器小匝短路保护[J].电力系统自动化,2005,29(3):57-60.BI Daqiang,WANG Xiangheng,WANG Weijian. Measured impedance based shunt reactor protection against small interturn fault[J].Automation of Electric Power Systems,2005,29(3):57-60.
[13]张庆莹.基于阻抗变化量的干式空心电抗器匝间短路监测方法研究[D].哈尔滨:哈尔滨理工大学,2015.ZHANG Qingying. Research of dry-type air-core reactor winding short-circuit monitoring method based on impedance variation[D].Harbin:Harbin University of Science and Technology,2015.
[14]BLASKO V,KAURA V. New mathematical model and control of a three-phase AC-DC voltage source converter[J]. IEEE Transactions on Power Electronics,2008,12(l):116-121.
[15]HUANG Xinbo,LI Hongbo,ZHU Yongcan. A short-term ice accretion forecasting model for transmission lines with modified time series analysis by fireworks algorithm[J]. IET Generation,Transmission&Distribution,2018,12(5):1074-1080.
[16]郭香福,孟波.空心并联电抗器匝间短路故障电流及其过流保护系统[J].变压器,2008,45(11):20-22.GUO Xiangfu,MENG Bo. Interturn short circuit fault current and overcurrent protective system of shunt reactor with air core[J].Transformer,2008,45(11):20-22.
[17]吴彦霖,谭向宇,马仪,等.电场分布以及匝数偏差暂态电动力对干式空心并联电抗器影响的研究[J].高压电器,2016,52(10):99-107.WU Yanlin,TAN Xiangyu,MA Yi,et al. Study of the influence of electric field distribution and turns deviation transient electrodynamic force on dry-type air-core shunt reactor[J]. High Voltage Apparatus,2016,52(10):99-107.
[18]冯小华,吴正茂,张承学.介损在线监测的3种改进谐波分析法的分析[J].高压电器,2005,41(1):4-5,9.FENG Xiaohua,WU Zhengmao,ZHANG Chengxue. Analysis of three modified algorithms for online measurement of tanδ[J]. High Voltage Apparatus,2005,41(1):4-5,9.