空气敷设下10kV三芯电缆应急能力评估方法
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摘要
随着城市用电需求量不断上升,面对紧急供电而需施加应急负荷时,配电网电缆能否承受应急负荷,以及导体温度到达稳定限值90℃所需时间是电力调度部门急需解决的问题。综合有限元和解析法,提出10 kV三芯电缆应急能力评估方法。首先,采用有限元法建立三芯电缆稳态温度场分析模型。其次,根据三芯电缆暂态热路等效模型推导出应急温升特性表达式,并借助数据拟合方法得到应急时间的四阶计算式。最后,设计了三芯电缆应急温升试验。仿真与试验结果表明,所提方法可有效评估三芯电缆应急能力。
With the increasing demand for electricity in city,when three-core cables need to load emergency loads for emergency power supply, it is urgent for power dispatching department to acknowledge whether the cable in distribution network can resist the emergency loads, and the time required for the conductor temperature to reach the stabilization limit of 90℃. The method of emergency capability assessment for 10 kV three-core cable is proposed based on finite element method and analytical method. Firstly, the finite element method is used to establish the steady-state temperature field analysis model of three-core cable. Secondly, according to the transient thermal circuit equivalent model of three-core cable, the expression of emergency temperature rise characteristic is deduced.And the fourth order formula of emergency time is obtained by means of data fitting. Lastly, the emergency temperature rise experiments of three-core cable are designed. The simulation and experimental results show that the proposed method can effectively evaluate the emergency capability of three-core cable.
With the increasing demand for electricity in city,when three-core cables need to load emergency loads for emergency power supply, it is urgent for power dispatching department to acknowledge whether the cable in distribution network can resist the emergency loads, and the time required for the conductor temperature to reach the stabilization limit of 90℃. The method of emergency capability assessment for 10 kV three-core cable is proposed based on finite element method and analytical method. Firstly, the finite element method is used to establish the steady-state temperature field analysis model of three-core cable. Secondly, according to the transient thermal circuit equivalent model of three-core cable, the expression of emergency temperature rise characteristic is deduced.And the fourth order formula of emergency time is obtained by means of data fitting. Lastly, the emergency temperature rise experiments of three-core cable are designed. The simulation and experimental results show that the proposed method can effectively evaluate the emergency capability of three-core cable.
引文
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[14]郑雁翎.电缆线路的电缆群载流量优化数值计算模型研究[J].高电压技术,2015,41(11):3760-3765.ZHENG Yanling.Research on optimal numerical calculation model of cable groups ampacity in cable route[J].High Voltage Engineering,2015,41(11):3760-3765.
[15]黄诗雅,吴勇,李磊.土壤直埋敷设单芯电力电缆温度场与载流量计算[J].武汉大学学报(工学版),2014,47(4):502-506.HUANG Shiya,WU Yong,LI Lei.Calculation of thermal field and ampacity of soil buried single-core power cable[J].Engineering Journal of Wuhan University(Engineering Science Edition),2014,47(4):502-506.
[16]李超群,沈培峰,马宏忠,等.多回路土壤直埋高压电缆温度场建模与载流量计算[J].高压电器,2015,51(10):63-69+75.LI Chaoqun,SHEN Peifeng,MA Hongzhong,et al.Modeling of soil buried multi-circuit cables'temperature field and ampacity calculation[J].High Voltage Apparatus,2015,51(10):63-69+75.
[17]张洪麟,唐军,陈伟根,等.基于有限元法的地下电缆群温度场及载流量的仿真计算[J].高压电器,2010,46(2):42-46.ZHANG Honglin,TANG Jun,CHEN Weigen,et al.Simulation of temperature field and ampacity of underground cable system based on finite element method[J].High Voltage Apparatus,2010,46(2):42-46.
[18]Calculation of the Current Rating,Part 1:Current Rating Equations(100%load factor)and Calculation of Losses:IEC 60287-1[S].2001.
[19]雷鸣.依据表皮温度准确计算单芯高压电缆线芯温度的理论及实验研究[D].广州:华南理工大学,2011.
[20]杨世铭,陶文铨.传热学[M].北京:高等教育出版社,2003.
[21]苏瑞波,王鹏,康守亚,等.空气敷设下10 kV三芯电缆应急时间计算[J].南方电网技术,2015,9(11):78-84.SU Ruibo,WANG Peng,KANG Shouya,et al.Emergency time calcuation for 10 kV three-core cable under air[J].Southern Power System Technology,2015,9(11):78-84.
[22]马国栋.电线电缆载流量[M].北京:中国电力出版社,2013.
[23]唐琪,李国伟.基于电缆局放试验的无线同步信号发生器的研制[J].电子设计工程,2016,(12):135-137.TANG Qi,LI Guowei.Design of wireless synchronous signal generator based on cable partial discharge test[J].SAMSON,2016,(12):135-137.
[24]李金洪.电缆连通性快速检测系统设计[J].电子设计工程,2014,(20):146-148.LI Jinhong.Design of fast detecting system for connectivity of cable[J].SAMSON,2014,(20):146-148.
[2]MARC D A,FRANCISCO D L.Adaptive soil model for real-time thermal rating of underground power cables[J].IET Science,Measurement&Technology,2015,9(6):654-660.
[3]唐科,文武,丁俊杰,等.基于有限元法的电缆接头温度场仿真[J].电力建设,2016,37(2):145-150.TANG Ke,WEN Wu,DING Junjie,et al.Temperature field simualtion of cable joints based on FEM[J].Electric Power Construction,2016,37(2):145-150.
[4]雷成华,吴晓强,蔡宝龙,等.应急负荷变动下高压电缆输电线路线芯温度的响应特性分析[J].绝缘材料,2013,46(1):36-39.LEI Chenghua,WU Xiaoqiang,CAI Baolong,et al.Analysis of response characteristic of HV cable transmission line conductor temperature under emergency load[J].Insulating Materials,2013,46(1):36-39.
[5]SAFDARIAN A,DEGEFA M Z.MAHMUD F F,et al.Benefits of real-time monitoring to distribution systems:dynamic thermal rating[J].IEEE Transactions on Smart Grid,2015,6(4):2023-2031.
[6]刘英,李文沛,曹晓珑,等.隧道敷设交流电缆线路的工频磁场特性[J].电力建设,2014,35(8):91-96.LIU Ying,LI Wenpei,CAO Xiaolong,et al.Characteristics of power frequency magnetic field for AC cable circuits laying in tunnels[J].Electric Power Construction,2014,35(8):91-96.
[7]燕怒,朱攀勇,熊晓晨.直埋单芯电缆的载流量数值计算[J].华北电力大学学报,2015,42(4):29-33.YAN Nu,ZHU Panyong,XIONG Xiaochen.Numerical calculation of ampacity of buried single-core cable[J].Journal of North China Electric Power University,2015,42(4):29-33.
[8]雷鸣,刘刚,邱景生,等.单芯电缆线芯温度的非线性有限元法实时计算[J].电网技术,2011,35(11):163-168.LEI Ming,LIU Gang,QIU Jingsheng,et al.Real-time core temperature calculation of single-core cable by nonlinear finite element method[J].Power System Technology,2011,35(11):163-168.
[9]方睿,鲁华祥,李志坚,等.基于矩阵广义逆的电缆线芯温度动态计算方法[J].电网技术,2015,39(1):97-102.FANG Rui,LU Huaxiang,LI Zhijian,et al.Dynamic calculation of cable core temperature based on generalized inverse of matrix[J].Power System Technology,2015,39(1):97-102.
[10]庄小亮,余兆荣,牛海清,等.日负载系数与10kV XLPE电缆周期负荷载流量关系的试验研究[J].电力自动化设备,2014,34(4):168-172.ZHUANG Xiaoliang,YU Zhaorong,NIU Haiqing,et al.Experimental research of relationship between daily load factor and cyclic ampacity of 10 kV XLPE cable[J].Electric Power Automation Equipment,2014,34(4):168-172.
[11]汤毅,王晓兵,陈燕萍,等.10 kV三芯交联电缆载流量的试验研究[J].高电压技术,2009,35(11):2807-2812.TANG Yi,WANG Xiaobing,CHEN Yanping,et al.Experimental research on the current rating of 10 kV threecore XLPE cables[J].High Voltage Engineering,2009,35(11):2807-2812.
[12]余兆荣,牛海清,庄小亮,等.直埋配电电缆应急负荷载流量的试验及其应用[J].绝缘材料,2014,47(5):82-86.YU Zhaorong,NIU Haiqing,ZHUANG Xiaoliang,et al.Emergency load ampacity experiment of buried distribution cable and its application[J].Insulating Materials,2014,47(5):82-86.
[13]刘刚,王鹏,李文祥.10 kV三芯电缆应急时间计算模型与验证[J].华南理工大学学报(自然科学版),2016,44(2):81-88.LIU Gang,WANG Peng,LI Wenxiang.Calculation model and its verification for cable emergency time of 10 kV three-core cable[J].Journal of South China University of Technology(Natural Science Edition),2016,44(2):81-88.
[14]郑雁翎.电缆线路的电缆群载流量优化数值计算模型研究[J].高电压技术,2015,41(11):3760-3765.ZHENG Yanling.Research on optimal numerical calculation model of cable groups ampacity in cable route[J].High Voltage Engineering,2015,41(11):3760-3765.
[15]黄诗雅,吴勇,李磊.土壤直埋敷设单芯电力电缆温度场与载流量计算[J].武汉大学学报(工学版),2014,47(4):502-506.HUANG Shiya,WU Yong,LI Lei.Calculation of thermal field and ampacity of soil buried single-core power cable[J].Engineering Journal of Wuhan University(Engineering Science Edition),2014,47(4):502-506.
[16]李超群,沈培峰,马宏忠,等.多回路土壤直埋高压电缆温度场建模与载流量计算[J].高压电器,2015,51(10):63-69+75.LI Chaoqun,SHEN Peifeng,MA Hongzhong,et al.Modeling of soil buried multi-circuit cables'temperature field and ampacity calculation[J].High Voltage Apparatus,2015,51(10):63-69+75.
[17]张洪麟,唐军,陈伟根,等.基于有限元法的地下电缆群温度场及载流量的仿真计算[J].高压电器,2010,46(2):42-46.ZHANG Honglin,TANG Jun,CHEN Weigen,et al.Simulation of temperature field and ampacity of underground cable system based on finite element method[J].High Voltage Apparatus,2010,46(2):42-46.
[18]Calculation of the Current Rating,Part 1:Current Rating Equations(100%load factor)and Calculation of Losses:IEC 60287-1[S].2001.
[19]雷鸣.依据表皮温度准确计算单芯高压电缆线芯温度的理论及实验研究[D].广州:华南理工大学,2011.
[20]杨世铭,陶文铨.传热学[M].北京:高等教育出版社,2003.
[21]苏瑞波,王鹏,康守亚,等.空气敷设下10 kV三芯电缆应急时间计算[J].南方电网技术,2015,9(11):78-84.SU Ruibo,WANG Peng,KANG Shouya,et al.Emergency time calcuation for 10 kV three-core cable under air[J].Southern Power System Technology,2015,9(11):78-84.
[22]马国栋.电线电缆载流量[M].北京:中国电力出版社,2013.
[23]唐琪,李国伟.基于电缆局放试验的无线同步信号发生器的研制[J].电子设计工程,2016,(12):135-137.TANG Qi,LI Guowei.Design of wireless synchronous signal generator based on cable partial discharge test[J].SAMSON,2016,(12):135-137.
[24]李金洪.电缆连通性快速检测系统设计[J].电子设计工程,2014,(20):146-148.LI Jinhong.Design of fast detecting system for connectivity of cable[J].SAMSON,2014,(20):146-148.
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