高压输电线缆增加敷设段长研究  

Research on increasing the segmented length in the high-voltage cable

作　　者：高飞 黄磊[2] 张蕾 张瑞永 刘静 吴述关 GAO Fei;HUANG Lei;ZHANG Lei;ZHANG Ruiyong;LIU Jing;WU Shuguan(Nanjing Power Supply Company,Nanjing 210019,China;School of Electrical Engineering,Southeast University,Nanjing 210096,China;Jiangsu Electric Power Design Institute,Nanjing 210036,China)

机构地区：[1]国网江苏省电力公司南京供电公司,江苏南京210019 [2]东南大学电气工程学院,江苏南京210096 [3]中国能源建设集团江苏省电力设计院有限公司,江苏南京210036

出　　处：《电气应用》2021年第1期35-41,共7页Electrotechnical Application

基　　金：江苏省电力公司科技项目资助(J2018067)。

摘　　要：传统高压单芯电缆设计分段长度偏短,导致电缆接头数量急剧增加,造成接头价格昂贵,工程投资随之上升,电缆运行的故障概率也相应提高。针对这一问题,开展高压输电线缆增加敷设段长对金属护套最大感应电压和护套环流的影响,并计算最大段长。基于瞬态电力系统仿真软件,对220 kV输电线缆在不同的接地方式、不同的排列方式下的金属护套感应电压进行仿真校验,分析了段长增长后对护套感应电压和护套环流的影响,获得了不同敷设方式下的电缆最大段长,并与解析结果进行对比。针对段长增大后不平衡负载和段长情况下的护套电压和电流的影响进行了仿真分析,为大长段高压电缆的分段提供了参考。The number of the connectors increase sharply because of the short segments in the traditional cable, which causes the cost of the project rising because of the high price of the connector. Meanwhile, the fault probability goes up when the cable working. For the problem, the research on increasing the segmented length in the high-voltage cable is carried out. Based on PSCAD software, the inducted voltage in the metal sheath of the high-voltage single-core cable and the circulating current are calculated under the different grounding and arranging style, with the nominal cross 2 500 mm~2 and the rated voltage 127/220 kV. The maximum segmented lengths and the circulating currents are obtained under the different laying conditions. The infuence rules of the grounding and arranging styles to the inducted voltage and circulating current are illuminated as well. Considering the unbalance of load and segment length, the sheath current under different unbalance of load and segment length are analyzed. All the results offer reference for the high-voltage single-core cable segmented.

关 键 词：高压电缆 增加段长 护套感应电压 护套环流 三相不平衡 

分 类 号：TM75[电气工程—电力系统及自动化]