Influence Analysis on Shielded Cables Caused by Diverting Potential Difference of Grounding Grid During Short Circuit to Earth Occurred in Substation

CHEN Li; LIAO Jiajun; CAO Xiaobin; TANG Xiaoqing; ZHENG Heping; DU Yinguan

doi:10.13296/j.1001-1609.hva.2014.10.032

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Influence Analysis on Shielded Cables Caused by Diverting Potential Difference of Grounding Grid During Short Circuit to Earth Occurred in Substation

更新时间：2025-04-26

- Influence Analysis on Shielded Cables Caused by Diverting Potential Difference of Grounding Grid During Short Circuit to Earth Occurred in Substation
- High VoltageApparatus Vol. 50, Issue 10, Pages: 43-48+55(2014)
- 作者机构：
  
  1. 1. 国网四川省电力公司技能培训中心输配电线路培训室
  2. 西南交通大学电气工程学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2014.10.032
  CLC： TM862
- Published：2014
- 稿件说明：
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[1]陈立,廖家俊,曹晓斌,汤晓青,郑和平,杜印官.变电站对地短路时接地网转移电位差对铠装电缆影响的研究[J].高压电器,2014,50(10):43-48+55.

CHEN Li, LIAO Jiajun, CAO Xiaobin, et al. Influence Analysis on Shielded Cables Caused by Diverting Potential Difference of Grounding Grid During Short Circuit to Earth Occurred in Substation[J]. High voltageapparatus, 2014, 50(10): 43-48+55.
[1]陈立,廖家俊,曹晓斌,汤晓青,郑和平,杜印官.变电站对地短路时接地网转移电位差对铠装电缆影响的研究[J].高压电器,2014,50(10):43-48+55. DOI： 10.13296/j.1001-1609.hva.2014.10.032.

CHEN Li, LIAO Jiajun, CAO Xiaobin, et al. Influence Analysis on Shielded Cables Caused by Diverting Potential Difference of Grounding Grid During Short Circuit to Earth Occurred in Substation[J]. High voltageapparatus, 2014, 50(10): 43-48+55. DOI： 10.13296/j.1001-1609.hva.2014.10.032.

摘要

在变电站接地网设计中

考虑到切合站场母线会对通信设备产生强大的电磁干扰

通常会将电缆屏蔽层两端接地。然而

在变电站受到雷击或发生短路故障情况下

电缆芯线与屏蔽层之间会产生巨大的转移电位差。这种电位差一方面可能会破坏电缆芯线与屏蔽层之间的主绝缘

形成电树枝或介质击穿

另一方面转移电位差会在铠装层形成回路

产生很大的暂态电流

干扰通信设备导致设备误操作。因此

转移电位差对变电站设备的影响亟待更深入的分析。笔者针对发生对地短路故障的变电站

建立铠装电缆的电气模型

给出变电站短路故障下芯线和屏蔽层之间的转移电位差解析式

分析电缆参数对转移电位差的影响

并且通过接地工程软件CDEGS分析接地网、土壤等参数对转移电位差的变化规律

提出抑制转移电位差的措施

为实际施工和建设提供理论依据。

Abstract

To reduce the interference on communication equipment caused by transient electromagnetic field of switching operation

the shielding layer of cable is connected to grounding grid on both terminals in the substations grounding designs. However

when the substation is stricken by lightning or short-circuit occurred

the great potential difference called diverting potential difference between the cable core and the shielding is generated

which can easily destroy the insulation of cables

even can cause electrical tree or dielectric breakdown in insulation material. Moreover

the large current flowing through the shield of cables will cause personnel accidents and equipment damages. In this paper

the electric model of cables is established when line-to-ground short-circuit occurs in substation. Formula of cable’s diverting potential difference is obtained

and influencing factors of diverting potential difference are discussed by changing cable parameters. Using grounding grid simulation software-CDEGS

the way diverting potential difference changes influenced by grounding grids

soil and other parameters is analyzed. Measures to reduce diverting potential difference are proposed for providing a theoretical basis of construction in practice.

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