The Influence Of Cross-bonded Parallel Cable Joints In The Same Tunnel On The Current Of Metal Sheath

ZHANG Chenghua; WANG Fengrun; LIU Bo; REN Zhigang; LI Huachun; LU Hailiang

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The Influence Of Cross-bonded Parallel Cable Joints In The Same Tunnel On The Current Of Metal Sheath

更新时间：2025-04-18

- The Influence Of Cross-bonded Parallel Cable Joints In The Same Tunnel On The Current Of Metal Sheath
- Moren Journal (2025)
- 作者机构：
  
  1.武汉大学电气与自动化学院,湖北省武汉市430072
  2.国网北京市电力公司电力科学研究院,北京市北京市100075
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：
  CLC：
- Received：23 October 2024，
  
  Revised：01 January 2025，
  
  Accepted：09 January 2025，
- 稿件说明：
移动端阅览
ZHANG Chenghua, WANG Fengrun, LIU Bo, et al. The Influence Of Cross-bonded Parallel Cable Joints In The Same Tunnel On The Current Of Metal Sheath[J/OL]. Moren journal, 2025.
DOI：

ZHANG Chenghua, WANG Fengrun, LIU Bo, et al. The Influence Of Cross-bonded Parallel Cable Joints In The Same Tunnel On The Current Of Metal Sheath[J/OL]. Moren journal, 2025. DOI：

摘要

随着同隧道并行电缆数目增加，电缆交叉互联段分段位置相同导致的零序护层电流超标问题愈发严重。根据电磁感应基本原理，将分段长度相同但分段位置不同的多回并行电缆进行虚拟分段，编程计算分段位置不同并行电缆的护层电流。研究表明：同侧支架并行电缆分段位置不同对电缆护层电流影响远大于异侧支架并行电缆分段位置不同产生的影响；大品字形回路电缆分段位置不同对护层电流影响大于小品字形回路电缆；对于同支架同段长三回电缆典型敷设方式，三回电缆分段位置相互错开时护层电流最小，且中间层电缆受上下两回电缆负荷电流影响较大，上下两层电缆护层电流受电缆分段变化影响的变化规律相同；对于典型的敷设工况，当负荷水平在100-400A间变化时，同支架并行电缆段护层相互错开分段，上层电缆护层电流大小平均降低17%，中层电流大小平均降低32%，下层电缆平均降低15%，能有效降低护层电流水平。

Abstract

With the increase of parallel working conditions of the same tunnel cable

the problem of excessive zero-sequence sheath current caused by the same segment position of the parallel cable cross-interconnection section becomes more and more serious. In this paper

according to the basic principle of electromagnetic induction

the multi-circuit parallel cables with the same segment length and different segment positions are virtually segmented

and the sheath current of parallel cables with the same segment length and different segment positions is calculated by programming. It is found that the influence of different section positions of the parallel cable on the same side support on the current of the cable sheath is much greater than that of the cable on the opposite side support. The influence of large glyph loop cable on sheath current is greater than that of small glyph loop cable. For the typical laying method of three-circuit cable with the same length on the same side

the sheath current is the smallest when the three-circuit cable segments are staggered with each other

and the middle layer cable is greatly affected by the load current of the upper and lower two-circuit cables

and the upper and lower two-layer cable sheath current is affected by the change of cable segments. For typical laying conditions

when the load level changes between 100-400 A

the sheaths of the parallel cable sections of the same support are staggered and segmented. The current of the upper cable sheath is reduced by 17 % on average

the current of the middle layer is reduced by 32 % on average

and the lower cable is reduced by 15 % on average

which can effectively reduce the current level of the sheath.

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references

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