220kV海缆对海底管道电磁干扰分析及评估  

Analysis and evaluation of electromagnetic interference of 220 kV submarine cable to submarine pipeline

作　　者：徐伟 李泊静 高媛 田念佩 梁毅 杜艳霞 XU Wei;LI Bojing;GAO Yuan;TIAN Nianpei;LIANG Yi;DU Yanxia(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou,Guangdong 510663,China;Institute for Advanced Materials and Technology,University of Science and Technology,Beijing 100083,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广东广州510663 [2]北京科技大学新材料技术研究院,北京100083

出　　处：《中国海上油气》2022年第5期197-204,共8页China Offshore Oil and Gas

摘　　要：中国海油某岸电工程拟新建2条220 kV海底电缆(简称“海缆”),与2条海底管道(简称“海管”)相距较近,且部分管线交叉跨越,存在交流干扰风险。为了合理布局新建海缆,基于海缆与海管相对位置、海缆与海管参数及环境信息,采用CDEGS软件建立了海缆对海管电磁干扰仿真模型,分析评估了稳态工况下,海缆与海管不同并行间距下,海缆对海管的交流干扰影响及对下水作业人员人身安全风险的影响。结果表明:海管受干扰程度随二者间距的增大而降低;当海缆1与海管P1的间距为70 m、海缆2与海管P2的间距为30 m时,海管P1、P2全线所受交流电流密度均低于交流干扰腐蚀低风险等级标准;据此结合岸电工程实际情况及设计裕量,推荐海缆1与海管P1、海缆2与海管P2的安全间距分别为100、50 m;在该安全间距下,海管P1、P2最大电场强度小于标准规定的人身安全电场强度限值。进一步针对该安全间距,开展了海缆单相短路故障工况下,海缆对海管的交流干扰模拟分析,发现当发生单相短路故障时,海管P1、P2防腐层耐受电压远低于规定的安全耐受电压限值,防腐层击穿风险较小;而海管P1、P2最大电场强度均高于全身浸没环境下规定的人身安全电场强度,相关人员下水作业时须采取全套安全防护。本研究为新建海缆布局及下水作业人员安全防护提供了参考。A shore power project of CNOOC plans to build two 220 kV submarine cables, which are close to and crossing over the adjacent two submarine pipelines, resulting in certain AC interference risks. In order to arrange the new submarine cables properly, based on the relative positions and parameters of submarine cables and submarine pipelines, as well as the environmental information, a simulation model of electromagnetic interference of submarine cables to submarine pipelines was established by using CDEGS software, and the influence of submarine cables on the AC interference of submarine pipelines and on the personal safety risk of diving operators under the steady state condition and different parallel distances between submarine cables and submarine pipelines was analyzed and evaluated. The results show that when the parallel distance between the 220 kV submarine cable and the submarine pipeline increases, the maximum AC current density in the submarine pipeline decreases;When the distances between the submarine cable 1 and submarine pipeline P1, submarine cable 2 and submarine pipeline P2 are 70 m and 30 m respectively, the whole line AC current densities of the two submarine pipelines are lower than the low risk level standard of AC interference corrosion. Considering the actual situation and the design margin of the shore power project, the safety distances between the submarine cable 1 and the submarine pipeline P1, the submarine cable 2 and the submarine pipeline P2 are recommended to be 100 m and 50 m respectively. Under the safety distances, the maximum electric intensities of submarine pipelines P1 and P2 are lower than the limit value of human safety electric intensity specified in the standard. Furthermore, aiming at these safety distances, the simulation analysis of AC interference of submarine cable to submarine pipeline was carried out in submarine cable single phase short circuit fault condition. It is found that the anticorrosive coating withstand voltages of the submarine pipelines P1 and P2 are fa

关 键 词：220kV海底电缆 岸电工程 海底管道 电磁干扰 并行间距 稳态工况 单相短路故障 

分 类 号：TM721[电气工程—电力系统及自动化]