隧道内电缆蛇形敷设特性  

Snaking of Cable in Tunnel

作　　者：徐伟[1] 郑志源[1] 

机构地区：[1]中国能源建设集团广东省电力设计研究院,广东广州510663

出　　处：《广东电力》2014年第12期118-122,共5页Guangdong Electric Power

摘　　要：为限制电缆热伸缩时的轴向力及金属护套应变,以截面积为2 500 mm2的220 kV交联电缆为例,研究隧道内电缆蛇形敷设特性。在分析了初始蛇形弧幅、蛇形节距对电缆轴向力、金属护套应变的影响的基础上,确定了蛇形节距的取值范围,认为应综合考虑轴向力、施工误差和金属护套寿命等因素来确定初始蛇形弧幅。从隧道空间及支架荷载、立柱荷载等方面对垂直蛇形和水平蛇形敷设方式进行了比较,指出实践中应结合工程特点合理选择电缆蛇形敷设方式和参数。For restricting axial force and metal sheath strain when the cable happened heat expansion,snaking of cable in tunnel was studied by taking 220 kV crosslinking cable with sectional area of 2 500 mm2 as an example. On the basis of analy-zing affect on axial force and metal sheath strain by initial serpentine arc radiation and serpentine pitch,value range of ser-pentine pitch was affirmed and factors including axial force,construction errors and metal sheath life were considered to de-termine initial serpentine arc width. In aspects of tunnel space and loads of supports and columns,vertical snaking of cable and horizontal snaking of cable was compared. It was pointed out that patterns and parameters of snaking of cable should be reasonably selected in combination with engineering characteristics.

关 键 词：电缆 隧道 垂直蛇形敷设 水平蛇形敷设 初始蛇形弧幅 蛇形节距 金属护套应变 

分 类 号：TM757.3[电气工程—电力系统及自动化]