[1]夏怀民.屏蔽线对直埋电缆直击雷的防护作用[J].电瓷避雷器,2020,(01):82-87.[doi:10.16188/j.isa.1003-8337.2020.01.014]
 XIA Huaimin.Protection Mechanism of Shield Wires on Buried Cable Against Direct Lightning Strike[J].,2020,(01):82-87.[doi:10.16188/j.isa.1003-8337.2020.01.014]
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屏蔽线对直埋电缆直击雷的防护作用()
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《电瓷避雷器》[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2020年01期
页码:
82-87
栏目:
避雷器
出版日期:
2020-02-20

文章信息/Info

Title:
Protection Mechanism of Shield Wires on Buried Cable Against Direct Lightning Strike
作者:
夏怀民
(国网孝感供电公司, 湖北 孝感 432000)
Author(s):
XIA Huaimin
(State Grid Xiaogan Power Supply Company of Hubei Electric Power Company Limited, Xiaogan 432000, China)
关键词:
电缆绝缘 电磁屏蔽 时域有限差分法 防雷保护
Keywords:
buried cable direct lightning strike shield wire finite-difference time-domain method
DOI:
10.16188/j.isa.1003-8337.2020.01.014
摘要:
采用时域有限差分法(FDTD)论证了屏蔽线对直埋电缆预防直接雷击的保护作用。FDTD模型由一公里长的绝缘电缆以及屏蔽线构成,雷击地点设置在正上方。该模型仿真计算得到的结果与文献中的实验实测结果相吻合,由此可证实模型正确性。结果表明,屏蔽线能有效防止直埋电缆被直接雷击; 雷击点附近电缆上电压与接地电阻呈现非线性正相关关系; 土壤表面电离是决定屏蔽线上分流电流和绝缘电缆上电压大小的主要因素。另外,屏蔽线周围的土壤电离作用很小,屏蔽线的电阻率对电缆电压峰值影响不明显,但对波形持续时间有影响。
Abstract:
The author adopts finite-difference time-domain(FDTD)method to investigate the protection mechanism of a shield wire against direct lightning strike to a buried power cable. The proposed model takes soil ionization into account, and has been validated by comparing its results with rock-triggered experiment results. The results indicate that the shield wire can effectively prevent the buried cable from direct lightning strikes. Some conclusions can be drawn in this paper: the voltage across the cable increase with ground resistance but not linear; the current in shield wire and the voltage across the cable depend on the soil surface ionization. Moreover, the influence of the soil ionization around the shield wire can be neglected. The electric resistivity of the shield wire has no effect on the voltage but on the duration time.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-05-25作者简介:夏怀民(1971—),男,高级工程师,主要研究方向:电网建设、电网规划,电网企业管理。
更新日期/Last Update: 2020-02-20