不同材质电缆支架对电缆运行适用性研究
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Research on Applicability of Different Material Cable Brackets to Cable Operation
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    摘要:

    在大电流作用下,电缆支架的导磁性会改变电缆周围的磁场分布,进而影响电缆本体运行,导致其温升变化,以往电力规程规范对于电缆支架的选材并未给出明确说明。文中以江苏省电力公司镇江市南徐220 kV变电站电缆为例,采用二维电磁场-流体场-温度场多物理场耦合有限元计算方法,研究不同载流量、不同电缆材质支架对电缆运行温升的影响。结果表明不同材质电缆支架因涡流引起的电缆支架温升不会危及人身及设备安全,是否选用非磁性材质支架应综合考虑涡流引起的损耗及经济性。文中考虑了电缆支架的影响,给出了支架选择时的理论与工程应用依据,对提高电缆建设经济性和运行可靠性有重要意义。

    Abstract:

    Under the effect of high current,the conductivity of the cable bracket will change the magnetic field distribution around the cable,affecting the operation and leading to changes in temperature.Conventional electricity standards and regulations has not given a clear explanation of the selection cable support.In this paper,we take NanXu 220 kV substation as an example,the effects of different current carrying capacity and cable materials on the temperature rise of cable are studied by using two-dimensional electromagnetic-fluid-temperature field coupling finite element analysis method.Analysis showed that the temperature rise of cable support due to eddy currents of different materials will not endanger the safety of human and equipment,whether uses a non-magnetic material depends on eddy currents and economy.This article breaks through the limitations of traditional cable temperature calculation,taking into account the impact of cable support,given the theory and practical application foundation when selecting the material,it has important significance in improving the construction s economy and the operational reliability.

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黄涛,文珊,王庭华,范逸斐,王颖,万鹭.不同材质电缆支架对电缆运行适用性研究[J].电力工程技术,2017,36(2):104-109

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  • 收稿日期:2016-11-03
  • 最后修改日期:2017-01-05
  • 录用日期:2017-02-20
  • 在线发布日期: 2017-05-27
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