摘要
厦门±320 k V柔性直流输电工程是目前世界上电压等级最高的柔性直流输电工程,该工程面临诸多难题。为此,探讨了该工程交联电缆及附件的选型原则、电缆运行温度、单段电缆长度、载流量截面、电缆敷设方式及交直流电缆共沟敷设等参数,为该工程构建中的技术难点提供了合理的解决方案。结果表明:当该工程中直流电缆运行温度取70℃时,电缆具有较好的绝缘性能;当电缆导体的截面积取1 800 mm2时,载流量为1 617 A,满足工程要求;当单段电缆长度取962 m时,可减少电缆接头、降低工程造价;电缆附件应选择现场注塑式;暂态和稳态情况下,采用交直流电缆共沟敷设可以满足安全稳定要求。
Xiamen ±320 kV Flexible DC Transmission Project is designed to work at the highest voltage among similar power transmission lines presently and it faces a lot of challenges. We discussed the selection of crosslink cable and cable accessory, cable operating temperature, length of cable segments, and cables＇ current-carrying capacity, as well as laying AC and DC cables in common tunnels. As a result, reasonable solutions for technology difficulties in the project are presented： setting the operating temperature of 70 ℃ for DC cables ensures good performance of the cables＇ insulation; cable conductors with sectional area of 1 800 mm^2 have current carrying capacity of 1 617 A, satisfying the requirements of engineering; 962 m is a reasonable length of segment cables that reduces the number of joints as well as the project cost; the cable accessories should be injection in-site type; for the project under either transient state or steady state, common-cable-tunnel laying of AC and DC power cables satisfies the requirements of both security and stability.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第4期1147-1153,共7页
High Voltage Engineering
