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不同直流拓扑结构和敷设环境下35 kV交流XLPE电缆直流载流量分析

张添胤 王启隆 王新 金泱 杨敏 陈向荣

张添胤, 王启隆, 王新, 金泱, 杨敏, 陈向荣. 不同直流拓扑结构和敷设环境下35 kV交流XLPE电缆直流载流量分析[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20220704
引用本文: 张添胤, 王启隆, 王新, 金泱, 杨敏, 陈向荣. 不同直流拓扑结构和敷设环境下35 kV交流XLPE电缆直流载流量分析[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20220704
ZHANG Tianyin, WANG Qilong, WANG Xin, JIN Yang, YANG Min, CHEN Xiangrong. Direct Current Ampacity of 35 kV Alternating Current Cross-Linked Polyethylene Cables Under Various Direct Current Topologies and Laying Environments[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220704
Citation: ZHANG Tianyin, WANG Qilong, WANG Xin, JIN Yang, YANG Min, CHEN Xiangrong. Direct Current Ampacity of 35 kV Alternating Current Cross-Linked Polyethylene Cables Under Various Direct Current Topologies and Laying Environments[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220704

不同直流拓扑结构和敷设环境下35 kV交流XLPE电缆直流载流量分析

doi: 10.3969/j.issn.0258-2724.20220704
详细信息
    作者简介:

    张添胤(2000—),男,博士研究生,研究方向为高压直流输电和电力电缆技术,E-mail:zhangtianyin_zju@163.com

    通讯作者:

    陈向荣(1982—),男,研究员,研究方向为先进电气材料与高压绝缘测试技术、先进电力装备与新型电力系统、高电压新技术,E-mail:chenxiangrongxh@zju.edu.cn

  • 中图分类号: TM247

Direct Current Ampacity of 35 kV Alternating Current Cross-Linked Polyethylene Cables Under Various Direct Current Topologies and Laying Environments

  • 摘要:

    交流电缆改为直流运行对于新能源发电并网以及提高供电容量有着重要意义. 以35 kV交流交联聚乙烯(cross-linked polyethylene,XLPE)电缆为研究对象,采用有限元方法对三线双极式、单极式和双极式3种直流拓扑结构下的三芯交流电缆进行温度场仿真;同时考虑配电网中常见的影响因素,如靠近热水管道、电缆集群敷设、电流不平衡等,研究其对交流电缆改为直流运行下的电缆载流量的影响. 研究发现:在相同工作温度下,35 kV交流XLPE电缆在单极式直流拓扑结构下运行时的载流量最小,在三线双极式直流拓扑下运行时的载流量最大;当交流电缆与城市供水管道水平间距为2.0 m,垂直间距为0.5 m时,在上述3种直流拓扑下运行时的载流量下降了约3.0%;在电缆集群敷设时,加载非同步峰值能使载流量最大提升90 A;电缆载流量随电流不平衡度先增大后减小,在不平衡度为0时,电缆载流量达到最大. 研究结果为35 kV交流XLPE电缆的直流改造提供了参考依据.

     

  • 图 1  三相电缆的双极式直流运行方案

    Figure 1.  Bipolar DC operation scheme of three-phase cables

    图 2  三相电缆的单极式直流运行方案

    Figure 2.  Monopolar DC operation scheme of three-phase cables

    图 3  三相电缆的TWBS-HVDC直流运行方案

    Figure 3.  TWBS-HVDC operation scheme of three-phase cables

    图 4  电缆的敷设环境

    Figure 4.  Laying environment of cable

    图 5  网格剖分

    Figure 5.  Mesh settings

    图 6  不同直流拓扑和直流负荷的缆芯温度

    Figure 6.  Cable core temperature under different DC topologies and loads

    图 7  通过210.0 A电流时单极式电缆的温度场分布

    Figure 7.  Temperature field distribution of monopolar cable at current of 210.0 A

    图 8  通过240.0 A电流时双极式电缆的温度场分布

    Figure 8.  Temperature field distribution of bipolar cable at current of 240.0 A

    图 9  不同直流拓扑和工作温度的电缆载流量

    Figure 9.  Cable ampacity under different DC topologies and operating temperatures

    图 10  热水管与电缆的相对位置

    Figure 10.  Distance from hot water pipe to cable

    图 11  电缆载流量随热水管道和电缆距离的变化

    Figure 11.  Variation of cable ampacity with distance from hot water pipe to cable

    图 12  集群电缆加载相同直流负荷时的温度场分布

    Figure 12.  Temperature field distribution of cluster cables under same DC load

    图 13  单根电缆运行时的温度场分布

    Figure 13.  Temperature field distribution of a single cable in operation

    图 14  集群电缆加载不同负荷时的温度场分布

    Figure 14.  Temperature field distribution of cluster cables under different loads

    图 15  电缆温度场分布

    Figure 15.  Temperature field distribution of cable

    图 16  电流不平衡度和三芯电流和之间的关系

    Figure 16.  Relationship between current unbalance and three-core current sum

    表  1  电缆材料与尺寸参数

    Table  1.   Cable materials and size parameters

    结构名称 材料 厚度/mm 直径/mm
    导体 13.0
    导体屏蔽层 半导体混合物 0.8 14.6
    XLPE 屏蔽层 XLPE 10.5 35.6
    绝缘屏蔽层 半导体混合物 1.0 37.6
    铜屏蔽层 0.2 38.0
    包带 聚丙烯 0.4 83.2
    内护套 聚氯乙烯 2.0 87.2
    铠装层 1.6 90.4
    外护套 聚氯乙烯 5.0 100.4
    下载: 导出CSV

    表  2  电缆材料的物理参数

    Table  2.   Physical parameters of cable materials

    材料 密度/
    (kg·m−3
    比热容/
    (J·(kg·K)−1
    热导率/
    (W·(m·K)−1
    8900 380 385.00
    XLPE 1200 1000 0.29
    聚氯乙烯 1380 1000 0.16
    半导电材料 1200 1100 0.28
    填充材料 550 1900 0.25
    7850 450 45.00
    下载: 导出CSV

    表  3  热水管道的材料和结构参数

    Table  3.   Hot water pipe materials and structural parameters

    结构名称 材料 厚度/mm 半径/mm
    工作区 516
    保温层 硬质聚氨酯 65 581
    外护管 高密度聚乙烯 15 596
    螺旋焊缝钢管 14 610
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-10-19
  • 修回日期:  2023-04-17
  • 网络出版日期:  2024-08-31

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