Effect of lightning on soil characteristics with and without underground cable

2016 2nd International Conference on Control, Instrumentation, Energy & Communication (CIEC) Pub Date : 1900-01-01 DOI:10.1109/CIEC.2016.7513765

Swarnankur Ghosh, S. Das

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引用次数: 1

Abstract

Indirect lightning stroke i.e. discharge between cloud and ground has strong impact on the UG (Under Ground) cable insulation. In this paper, the impact of lightning stroke in UG cable is investigated. High current carried by lightning stroke to ground creates breakdown channel in soil if the resulting field exceeds soil breakdown strength. Through this channel current can reach cable and if the resulting field generated on cable surface exceeds breakdown strength of cable insulation then also the cable can damage. So proper assessment of Electric field distribution in soil and on cable surface due to lightning current is necessary to envisage proper planning of protection scheme and strategy for mitigating severity to UG cable. In this paper, a complete study is done to investigate electric field distribution in soil due to lightning stroke, minimum lightning current required for soil breakdown, current intercepted by buried cable and overvoltage generated on cable surface due to that current. Also the effects of various factors like soil resistivity, cable location, lightning strike position, lightning current etc. are studied.

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有无地下电缆时雷电对土壤特性的影响

间接雷击即云和地之间的放电对地下电缆的绝缘有较大的影响。本文研究了雷击对UG电缆的影响。如果产生的电场超过土壤击穿强度，雷击对地的大电流就会在土壤中形成击穿通道。电流通过这个通道到达电缆，如果在电缆表面产生的磁场超过电缆绝缘的击穿强度，也会对电缆造成损坏。因此，有必要对雷电电流在土壤和电缆表面的电场分布进行正确的评估，以设想合理的保护方案和策略，以减轻对UG电缆的严重性。本文对雷击后土壤中的电场分布、土壤击穿所需的最小雷击电流、埋地电缆截获的电流以及该电流在电缆表面产生的过电压进行了较为全面的研究。并对土壤电阻率、电缆位置、雷击位置、雷击电流等因素的影响进行了研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 2nd International Conference on Control, Instrumentation, Energy & Communication (CIEC)

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