Open AccessModel of ferromagnetic steels for lightning transient analysis
Author(s) -
Chen Hongcai,
Du Yaping
Publication year - 2018
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2017.0400
Subject(s) - transient (computer programming) , equivalent circuit , lightning (connector) , short circuit , electrical conductor , magnetic circuit , emtp , electronic circuit , surge , materials science , current (fluid) , electrical engineering , mechanics , power (physics) , voltage , engineering , electric power system , computer science , physics , magnet , quantum mechanics , operating system
This study investigates the model of structural steels used in the lightning current analysis. These steels, magnetic material, can be found in grounded structures, such as towers and buildings. An equivalent electrical circuit is presented first for these magnetic conductors under lighting transient current. Circuit parameters of the steel wires are determined numerically with an equivalent circuit approach. A rational function approximation is incorporated for developing an extended circuit model of frequency‐dependent circuits used in time‐domain simulations. Experiments are carried out to disclose the transient response of both steel bars and rods when they carry a surge current directly. It is found that these steel wires exhibit weak ferromagnetism, and can be represented with linear magnetic materials. The proposed modelling procedure is applied to analyse surge current sharing in a three‐dimensional steel wire/power cable system adopted in radio base stations. Good agreements with the experimental results are observed.