Fitting Formula of Sheath Current and the Arrangement Optimization of Cables

WANG Yongzhi; CAO Wei; LIANG Haisheng; LI Fan

doi:10.13296/j.1001-1609.hva.2017.01.013

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Fitting Formula of Sheath Current and the Arrangement Optimization of Cables

更新时间：2025-04-26

- Fitting Formula of Sheath Current and the Arrangement Optimization of Cables
- High VoltageApparatus Vol. 53, Issue 1, Pages: 77-82(2017)
- 作者机构：
  
  1. 上海电力学院
  2. 国网上海市电力公司经济技术研究院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2017.01.013
  CLC： TM75
- Published：2017
- 稿件说明：
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[1]王永志,曹炜,梁海生,李帆.电缆护套环流估算公式的拟合及排列方式的优化[J].高压电器,2017,53(01):77-82.

WANG Yongzhi, CAO Wei, LIANG Haisheng, et al. Fitting Formula of Sheath Current and the Arrangement Optimization of Cables[J]. High VoltageApparatus, 2017, 53(1): 77-82.
[1]王永志,曹炜,梁海生,李帆.电缆护套环流估算公式的拟合及排列方式的优化[J].高压电器,2017,53(01):77-82. DOI： 10.13296/j.1001-1609.hva.2017.01.013.

WANG Yongzhi, CAO Wei, LIANG Haisheng, et al. Fitting Formula of Sheath Current and the Arrangement Optimization of Cables[J]. High VoltageApparatus, 2017, 53(1): 77-82. DOI： 10.13296/j.1001-1609.hva.2017.01.013.

摘要

护套交叉互联双端接地电缆中

3段电缆长度不均等

或电缆排列方式不对称

均会导致金属护套中产生环流。文中分析了排管敷设的单回路交叉互联电缆金属护套感应电压相量和

采用EMTP模型仿真不同的电缆分段长度差下的金属护套环流

得到EMTP仿真数据样本

用来拟合金属护套环流估算公式

最后将拟合的估算公式计算值与EMTP仿真数据进行对比

检验了估算公式的适用性。此外

还分析了不同排列方式感应电压相量

提出并验证了在不等长分段电缆中

采用恰当的混合排列方式可以降低金属护套环流。

Abstract

There will be circulating current in metal sheath of cross-bonding cables when the lengths or arrangements of three segments are different. In pipe layout the phasor sum of the induced sheath voltages in sheath cross bonding cables is firstly analyzed. Then the circulating current is calculated by EMTP with varied differences among three segment lengths to get the sample data

which are in turn used to fit out the empiric formula for evaluating the sheath circulating current in practical engineering application. Finally the principle of mixed arrangement is proposed to reduce sheath circulating current in sheath cross bonding cables when the lengths of cable segments are not equal.

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