单芯电缆分段长度的影响因素分析  

Analysis of Influencing Factors on Segment Length of Single Core Cable

作　　者：邓少民 DENG Shaomin(Beijing Tianrun Xinneng Investment Co.,Ltd.,Beijing 100001,China)

机构地区：[1]北京天润新能投资有限公司,北京100001

出　　处：《通信电源技术》2023年第5期223-225,共3页Telecom Power Technology

摘　　要：对于长度大于1000 m的长距离单芯电缆线路工程,延长单芯电缆的分段长度,减少电缆中间接头数量,可以提高工程的经济性,增加线路运行的可靠性,但单芯电缆分段长度受到各种影响的因素。从单芯电缆的感应电压制约因素、运输条件制约因素2个方面分析了其最大分段长度的可行性。研究表明:对于长距离(>1000 m)的单芯电缆线路工程,当电缆金属护层采用交叉互联接地时,感应电压(允许值50 V)已不再是制约因素,电缆分段长度制约因素主要是允许运输长度。长度大于1000 m的长距离单芯电缆分段长度可以按照电缆允许运输长度来进行设计,但还是需要考虑外界因素的影响。For the long-distance single-core cable line project with a length of more than 1000 m,extending the segment length of single-core cable and reducing the number of cable intermediate joints can improve the project economy and increase the reliability of line operation,but the segment length of single-core cable is affected by various factors.In this paper,the feasibility of the maximum segment length of single-core cable is analyzed from two aspects:the induced voltage restriction factor and the transportation condition restriction factor.The research shows that for the long-distance(>1000 m)single-core cable line project,when the metal sheath of the cable adopts cross interconnection grounding,the induced voltage(allowable value of 50 V)is no longer the limiting factor,and the limiting factor of the cable segment length is mainly the allowable transportation length.The sectional length of long-distance single-core cable with a length greater than 1000 m can be designed according to the allowable transportation length of the cable,but the influence of external factors still needs to be considered.

关 键 词：单芯电缆 感应电压 两接接地 单端接地 交叉互联接地 

分 类 号：TM75[电气工程—电力系统及自动化]