Citation

Hu Y, Liu L, An Y, Xiang Z, Huang T, Lyu Q. China Saf. Sci. J. 2020; 30(2): 140-145.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.02.022

PMID

unavailable

Abstract

In order to study influence of epitaxial ray structure of grounding grid on its drainage, protection measures were proposed to reduce overvoltage of oil and gas pipelines near transmission towers caused by the natural disaster of lightning. Firstly, lightning protection calculation software CDEGS was used to build a structural model of grounding grid and nearby pipelines. Then, influence of epitaxial rays in three states, namely approaching, deviating and parallel, on pipelines' potential was studied in conditions of different current amplitude, soil resistivity and pole tower and pipeline spacing, and variation law of pipeline overvoltage after adoption of continuation scheme was explored. The results show that influence of drainage capacity of epitaxial rays at three states on lightning overvoltage of pipelines shows different trends. After adoption of continuation scheme, the overvoltage is significantly reduced, therefore this scheme can be used as a protection measure against pipeline lightning overvoltage. © 2020 China Safety Science Journal. All rights reserved.

Language: zh