摘要
500 kV交流海底电缆通常在线路两端将金属护套及铠装并联后直接接地,此时在护套及铠装上会产生相当大的环流和损耗,进而导致陆上段载流量受限,成为整个海缆线路的输送容量瓶颈。海缆接地方式的选择直接关系着海缆外护层过电压水平、电缆环流水平及电缆输送容量。以南方主网与海南电网第二回联网海底电缆结构型式为例,对锚固点及终端处的接地方式进行优化,即在两侧锚固装置处直接接地,海缆线路两侧终端处经护层电压限制器接地,在满足登陆段外护层感应电压及过电压要求的情况下,提高海底电缆载流量。
The 500 kV AC submarine cable is usually grounded directly after the metal sheath and armor are connected in parallel at both ends of the line,which will generate considerable circulating current and loss in the sheath and armor,leading to the restriction of current rating of the land section and thus resulting in the bottleneck of the transmission capacity of the whole submarine cable line.The choice of submarine cable grounding method is directly related to the metal sheath overvoltage level,cable circulation current level and cable transmission capacity.This paper takes the southern main network and Hainan power grid second network submarine cable structure type as an example,optimizes the grounding method at the anchorage point and terminal,that is,direct grounding at both sides of the anchorage device,both sides of the submarine cable line terminal grounded by sheath voltage limiter.Under the condition of meeting the requirements of induced voltage and overvoltage of landing section,the submarine cable load capacity can be increased.
作者
李健
岳浩
吴庆华
吴高波
罗楚军
LI Jian;YUE Hao;WU Qinghua;WU Gaobo;LUO Chujun(Central Southern China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Wuhan 430071,China)
出处
《电力勘测设计》
2023年第4期64-67,共4页
Electric Power Survey & Design
关键词
海底电缆
载流量
接地方式
submarine cable
current rating
grounding method
