输电电缆经钢护管的涡流损耗计算与分析  

Eddy Current Loss Analysis of Power Cable Passing Through Steel Tube

作　　者：车俊禄[1] 吴旭涛[1] 田禄[1] 张淮清[2] 

机构地区：[1]国网宁夏电力公司电力科学研究院,宁夏银川750011 [2]重庆大学电气工程学院,重庆400044

出　　处：《计算机仿真》2016年第8期392-396,共5页Computer Simulation

摘　　要：在地铁电缆施工中已发现违规使用未消磁的钢护管,可能引起的强涡流造成重大安全隐患。针对电缆经钢护管的涡流问题,应用电磁场有限元计算方法分析了磁场与感应电流分布、涡流损耗情况,研究表明:对于实例中的单电缆穿套管方案,采用消磁钢护管的总损耗仅11.7641 W/m,而未消磁时却高达91.6556W/m;在未消磁钢护管情形下,电缆屏蔽层的厚度较放置位置影响更明显。因此,施工中必须采用消磁钢护管,而对于已埋未消磁钢护管的工程,可通过在电缆外部包围屏蔽层方式整改,能够降低总损耗、电缆屏蔽层损耗并有利于散热。The violation of using non-demagnetization steel tube has been found in subway projects. The strong eddy current in steel tube may cause significant safety risks. Thus,the eddy current problems in power cable passing through steel tube were investigated in this paper. Magnetic field distribution,induced current distribution and eddy current loss were analyzed with the finite element method. The results show that： the total loss of demagnetization steel tube is only 11. 7641 W / m,however the loss of non-demagnetization steel tube is outrageous and up to91. 6556 W / m. The influence of the cable shield thickness is much more obvious than the cable placement schemes.Therefore,the demagnetization steel tube must be adopted in the subway project. For non-demagnetization situation,the cable can be surrounded by an outer shield which can reduce the total loss and improve the cable thermal performance.

关 键 词：电缆 钢管护套 消磁 涡流损耗 

分 类 号：TM743[电气工程—电力系统及自动化]