基于热力耦合的高压大截面电缆应力和形变研究
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摘要
为了研究高压大截面电缆运行过程中受热产生的应力和形变,根据传热学和弹性力学基本理论,利用有限元方法建立高压大截面电缆热力耦合模型计算其应力及形变。根据计算结果得到电缆各层温度、应力和形变的分布特性。通过对不同负荷电流下的温度、应力和形变数据进行拟合,提出相应的快速计算公式。结果表明:导体与绝缘层交界面的接触应力最大;最大轴向形变出现在绝缘层;外护层与缓冲层的径向形变较大;温度、应力和形变可由与负荷电流相关的二次多项式进行快速计算。
In order to study the stress and deformation caused by heat during the operation of high voltage cable with large section, according to the basic theory of heat transfer and elasticity, a thermal-mechanical coupling model of high voltage cable with large section was established by finite element method to calculate its stress and deformation. The distribution characteristics of temperature, stress, and deformation in each layer of cable were obtained according to the calculation result. The data of temperature,stress, and deformation under different load currents were fitted, and the corresponding fast calculation formulas were proposed. The results show that the contact stress at the interface between conductor and insulation layer is the largest, the maximum axial deformation appears at the insulation layer, and the radial deformation of outer sheath and buffer layer are relatively large. The temperature, stress, and deformation can be quickly calculated by the quadratic polynomials related to the load current.
In order to study the stress and deformation caused by heat during the operation of high voltage cable with large section, according to the basic theory of heat transfer and elasticity, a thermal-mechanical coupling model of high voltage cable with large section was established by finite element method to calculate its stress and deformation. The distribution characteristics of temperature, stress, and deformation in each layer of cable were obtained according to the calculation result. The data of temperature,stress, and deformation under different load currents were fitted, and the corresponding fast calculation formulas were proposed. The results show that the contact stress at the interface between conductor and insulation layer is the largest, the maximum axial deformation appears at the insulation layer, and the radial deformation of outer sheath and buffer layer are relatively large. The temperature, stress, and deformation can be quickly calculated by the quadratic polynomials related to the load current.
引文
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[2]李欢,李建英,马永翔,等.不同温度热老化条件下交联聚乙烯电缆绝缘热性能和力学性能的劣化趋势研究[J].绝缘材料,2018,51(1):57-63.
[3] LIU Y P, LIU H C, YU L C, et al. Effect of thermal stress on the space charge distribution of 160 kV HVDC cable insulation material[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2017,24(3):1355-1364.
[4]黄振,聂诗超,王锐,等. 110kV XLPE电缆绝缘层内应力的测试方法与分析[J].绝缘材料,2017,50(6):64-68.
[5] SEDAGHAT A, DE LEóN F. Thermal analysis of power cables in free air:Evaluation and improvement of the IEC standard ampacity calculations[J]. IEEE Transactions on Power Delivery,2014,29(5):2306-2314.
[6]段佳冰,尹成群,吕安强,等.基于IEC 60287和有限元法的高压海底电缆温度场分析方法[J].高压电器,2014,50(1):1-6.
[7]梁永春.高压电力电缆温度场和载流量评估研究动态[J].高电压技术,2016,42(4):1142-1150.
[8]梁永春,赵静,闫彩红.沟槽电缆温度场和载流量的数值计算[J].高电压技术,2012,38(11):3048-3053.
[9]王有元,陈仁刚,陈伟根,等.有限元法计算地下电缆温度场及其影响因素[J].高电压技术,2008,34(12):3086-3092.
[10]郑雁翎,仪涛,张冠军,等.分散式排管敷设电缆群温度场的流固耦合计算[J].高电压技术,2010,36(6):1566-1571.
[11]张磊,宣耀伟,乐彦杰,等. 110kV单芯海缆的载流量计算、温度场仿真及其热循环试验研究[J].高压电器,2016,52(6):135-140.
[12]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):42-51.
[13]刘刚,李炀,陈垣,等.基于电磁-热耦合模型的架空导线温度分布和径向温差的计算与实验验证[J].电力系统保护与控制,2018,46(7):7-13.
[14] GELA G, DAI J J. Calculation of thermal fields of underground cables using the boundary element method[J].IEEE Transactions on Power Delivery,1988,3(4):1341-1347.
[15]李志坚,张东斐,曹慧玲,等.地下埋设电缆温度场和载流量的数值计算[J].高电压技术,2004,30(4):27-30.
[16]罗俊华,张丽,刘毅刚,等.超高压大截面电力电缆线路热膨胀计算分析[J].高电压技术,2010,36(5):1281-1286.
[17]刘航宇,刘念,蒲丽娟,等.基于ANSYS的高压大截面电缆金具短路电动力和机械应力分析[J].电工技术学报,2016,31(5):170-176.
[18]孟凡凤,李香龙,徐燕飞,等.地下直埋电缆温度场和载流量的数值计算[J].绝缘材料,2006,39(4):59-64.
[19] International Electro technical Commission. Electric calesCalculation of the current rating-Part 1-1:Current rating equations(100%load factor)and calculation of lossesGeneral:IEC 60287-1-1:2006[S]. Geneva,Switzerland:IEC,2006.
[20]马国栋.电线电缆载流量[M].第二版.北京:中国电力出版社,2013.
[21]王祖城,汪家才.弹性和塑性理论及有限单元法[M].北京:冶金工业出版社,1983.
[22]刘骥,张明泽,张振鹏,等.外部振动对500kV交联聚乙烯电缆敷设条件的影响[J].高电压技术,2017,43(2):673-681.
[23]程鹏.电缆接头内部缺陷下的电磁-热-力特性及表征方法研究[D].重庆:重庆大学,2016.
[24]电力行业电力规划设计标准化技术委员会.城市电力电缆线路设计技术规定:DL/T 5221—2005[S].北京:中国电力出版社,2005.