断路器手车触头过热性故障机理分析及防止措施
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摘要
断路器手车触头接触不良发热,会导致过热,甚至会发展成为电网事故。基于多场耦合有限元法建立了断路器手车触头温升计算的三维模型,采用该模型对不同插入深度和偏移角度进行了力场计算,分析了静触头插入深度和偏移角度对接触压力的影响,并进行了插入深度试验,结果表明,插入深度不足导致的梅花触头接触电阻增大是断路器手车触头过热性故障的主要原因。接着计算分析了在额定电流作用下静触头插入深度为1/2时的断路器手车触头稳定温升、电流密度与应力分布。最后搭建了装有记忆合金材料压片的梅花触头和装有普通材料压片的梅花触头的对比温升试验平台,结果表明,使用记忆合金压片有助于降低梅花触头温升,有效地降低了过热性故障的故障率。
Poor contacting of circuit breaker handcart contact will result in overheating of contact,or even lead to ac-cident of power grid. A 3-D finite element model based on the coupled field theory to calculate the temperature risein circuit breaker handcart contact is built. The model is adopted for stress field calculating in different cases,andanalyzing the influences of static contact insertion depth and offset angle on contact pressure. And the insertion depthexperiment is carried out. It is concluded that the insufficient insertion depth led to increasing contact resistance ofplum blossom contact is the main cause of overheating faults in circuit breaker handcart contact. Then the steady tem-perature,current density and stress distribution of circuit breaker handcart contact to carry rated current when staticcontact insertion depth is 1/2 are calculated and analyzed. Finally,the contrast temperature rise experimental plat-form of plum blossom contact with memory alloy tablets and plum blossom contact with common tablets is set up. Theresults show that the memory alloy tablets is helpful to reduce the temperature rise of the plum blossom contact,it can effectively reduce the overheat fault.
Poor contacting of circuit breaker handcart contact will result in overheating of contact,or even lead to ac-cident of power grid. A 3-D finite element model based on the coupled field theory to calculate the temperature risein circuit breaker handcart contact is built. The model is adopted for stress field calculating in different cases,andanalyzing the influences of static contact insertion depth and offset angle on contact pressure. And the insertion depthexperiment is carried out. It is concluded that the insufficient insertion depth led to increasing contact resistance ofplum blossom contact is the main cause of overheating faults in circuit breaker handcart contact. Then the steady tem-perature,current density and stress distribution of circuit breaker handcart contact to carry rated current when staticcontact insertion depth is 1/2 are calculated and analyzed. Finally,the contrast temperature rise experimental plat-form of plum blossom contact with memory alloy tablets and plum blossom contact with common tablets is set up. Theresults show that the memory alloy tablets is helpful to reduce the temperature rise of the plum blossom contact,it can effectively reduce the overheat fault.
引文
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[2]李晶,满家健,周电波,等.金属封闭高压开关柜手车触头温度场仿真分析及实验研究[J].高压电器,2015,51(8):74-79.LI Jing,MAN Jiajian,ZHOU Dianbo,et al. Simulation analysis and experimental research on temperature distribution of metal-enclosed high voltage switchgear handcart contactor[J]. High Voltage Apparatus,2015,51(8):74-79.
[3]王俊波,苗银银,罗容波,等. GIS触头接触状况检测现状分析[J].高压电器,2013,49(12):137-140.WANG Junbo,MIAO Yinyin,LUO Rongbo,et al. Analysis of present situation of GIS contact detection[J]. High Voltage Apparatus,2013,49(12):137-140.
[4]周蠡,鲁铁成,罗容波,等.气体绝缘组合电器触头电接触状态检测与评估方法[J].高电压技术,2015,41(1):217-224.ZHOU Li,LU Tiecheng,LUO Rongbo,et al. Detection and evaluation method of electrical contact state in gas insulated switchgear[J]. High Voltage Engineering,2015,41(1):217-224.
[5]王红艳. 12 kV可移开式手车断路器的电动力分析及设计改进[J].高压电器,2016,52(9):50-54.WANG Hongyan. Electrodynamic force analysis and design improvement of 12 kV withdrawable circuit breaker[J]. High Voltage Apparatus,2016,52(9):50-54.
[6]陈强,李庆民,丛浩熹,等.高压开关设备触头温度监测技术研究进展[J].高压电器,2015,51(9):146-153.CHEN Qiang,LI Qingmin,CONG Haoxi,et al. Advancementof temperature monitoring techniques for HV switchgear contacts[J]. High Voltage Apparatus,2015,51(9):146-153.
[7]杨志淳,乐健,靳超,等.基于气体传感器技术的中高压开关柜过温监测系统[J].电力自动化设备,2011,31(4):116-119.YANG Zhichun,YUE Jian,JIN Chao,et al. HV and MV switch cabinet over-temperature supervising system based on gas sensor[J]. Electric Power Automation Equipment,2011,31(4):116-119.
[8]邢晓敏,李波,陈静.电力高压触点温度无线监测系统的研发[J].电力系统保护与控制,2010,38(22):174-178.XING Xiaomin,LI Bo,CHEN Jing. Development of wireless monitoring system for power high voltage contacts’temperature[J]. Power System Protection and Control,2010,38(22):174-178.
[9]陈雪薇,马国明,李成榕,等.高压开关柜无线测温系统设计及可靠性研究[J].高压电器,2015,51(6):152-160.CHEN Xuewei,MA Guoming,LI Chengrong,et al. WirelessTemperature measuring system design for high voltage switchgear and its reliability research[J]. High Voltage Apparatus,2015,51(6):152-160.
[10]赵舫,唐忠,崔昊杨.基于荧光光纤测温的电气设备在线监测系统[J].电测与仪表,2015 52(4):85-89.ZHAO Fang,TANG Zhong,CUI Haoyang. On-line detection system of the electrical equipment based on fluorescence optical fiber temperature measuring[J]. Electrical Measurement&Instrumentation,2015,52(4):85-89.
[11]徐立群,申亮,倪福生. KYN28A-12kV/4000A开关柜的结构改进与温度场分析[J].高压电器,2017,53(3):254-258.XU Liqun,SHEN Liang,NI Fusheng. Structure modificationand temperature field analysis of KYN28A-12 k V/4 000 A switchgear cabinet[J]. High Voltage Apparatus,2017,53(3):254-258.
[12]王秉政,江健武,赵灵,等.高压开关柜接触发热温度场数值计算[J].高压电器,2013,49(12):42-48.WANG Bingzheng,JIANG Jianwu,ZHAO Ling,et al. Temperature field simulation of contact heating in high voltage switchgear[J]. High Voltage Apparatus,2013,49(12):42-48.
[13]何淼,CHEN G,LEWIN P L.内部缺陷对高压直流电缆电场分布影响的有限元分析[J].南方电网技术,2015(10):83-91.HE Miao,CHEN G,LEWIN P L. Analysis on influence of internal defect on electric field distortion of HVDC cable with finite element method[J]. SouthernPower System Technology,2015(10):83-91.
[14] WILLIAM B J. COMSOL Multiphysics有限元法多物理场建模与分析[M].北京:人民交通出版社,2007:1-45.WILLIAM B J. COMSOL Multiphysics physical field modeling and analysis with finite element method[M]. Beijing:People’s Communication Press,2007:1-45.
[15]王刚,安琳. COMSOL Multiphysics工程实践与理论仿真[M].北京:电子工业出版社,2012:1-7.WANG Gang,AN Lin. COMSOL Multiphysics engineering practice and theoretical simulation[M]. Beijing:Electronic Industry Press,2012:1-7.
[16]孙鹏,马少华.电器学[M].北京:科学出版社,2012:151.SUN Peng,MA Shaohua. Electrical appliances[M]. Beijing:Science Press,2012:151.
[17]黎斌. SF6高压电器设计[M].北京:机械工业出版社,2003:76.LI Bin. Design of SF6 high voltage electrical appliance[M].Beijing:Mechanical Industry Press,2003:76.