基于有限元分析预制电缆接头界面压力测量方法的研究
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摘要
预制式电缆接头在电缆线路中应用广泛,电缆与预制接头间界面压力的大小及其分布的均匀性是衡量电缆连接质量的重要因素。实测表明,预制电缆接头安装前后轴向长度会有较大变化,安装后外半径沿轴向变化,而这种变化无法通过理论、有限元的过盈配合分析去体现,且现场测试操作困难。提出了一种以安装实测数据为基础,通过有限元模拟实际装配过程得到界面压力及其分布情况的方法。并以实际预制接头为例,对有限元计算和试验所得界面压力进行对比分析,验证了该方法的合理有效性。研究工作对预制接头的设计及安装具有指导与参考意义。
Prefabricated cable joints are widely used in cable lines. The size and distribution uniformity of interfacial pressure between cables and prefabricated joints is an important factor to measure the quality of cable connections.The actual measurement shows that the axial length of the prefabricated cable connector will change greatly before and after installation, and the outer radius will change along the axial direction after installation, which cannot be reflected by theoretical and finite element interference fit analysis, and it is difficult to conduct field test.This paper presents a method to obtain the interfacial pressure and its distribution by fem simulation based on the measured installation data.Taking the prefabricated joint as an example, the finite element calculation and the surface pressure obtained from the test were compared and analyzed, which verified the rationality and effectiveness of the method.The research work has guiding and referential significance for the design and installation of prefabricated joints.
Prefabricated cable joints are widely used in cable lines. The size and distribution uniformity of interfacial pressure between cables and prefabricated joints is an important factor to measure the quality of cable connections.The actual measurement shows that the axial length of the prefabricated cable connector will change greatly before and after installation, and the outer radius will change along the axial direction after installation, which cannot be reflected by theoretical and finite element interference fit analysis, and it is difficult to conduct field test.This paper presents a method to obtain the interfacial pressure and its distribution by fem simulation based on the measured installation data.Taking the prefabricated joint as an example, the finite element calculation and the surface pressure obtained from the test were compared and analyzed, which verified the rationality and effectiveness of the method.The research work has guiding and referential significance for the design and installation of prefabricated joints.
引文
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[6] 张东升,韩永胜,刘红欣,等.高压电缆接头界面压力测试研究[J].高电压技术,2007,33(1):173-176.
[7] 徐芝纶,弹性力学上册[M].北京:高等教育出版社,2016:75-80.
[2] 王佩龙.高压电缆附件的电场及界面压力设计[J].电线电缆,2011(5):1-4.
[3] Suh K S,Jin H N,Ji H K,et al.Interfacial properties of XLPE/EPDM laminates[J].IEEE Transactions on Dielectrics & Electrical Insulation,2000,7(2):216-221.
[4] Tanaka T,Ito T,Tanaka Y,et al.Carrier jumping over a potential barrier at the interface of LDPE laminated dielectrics[C].Conference Record of the 2000 IEEE International Symposium on Electrical Insulation.IEEE,2000:40-43.
[5] 崔江静,余栋,王霞,等.电缆本体与附件界面压力测量方法的研究进展[J].绝缘材料,2018,51(3):1-6.
[6] 张东升,韩永胜,刘红欣,等.高压电缆接头界面压力测试研究[J].高电压技术,2007,33(1):173-176.
[7] 徐芝纶,弹性力学上册[M].北京:高等教育出版社,2016:75-80.