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Title: Model of ferromagnetic steels for lightning transient analysis
Authors: Chen, HC 
Du, YP 
Keywords: Steel
Lightning protection
Electrical safety
Ferromagnetic materials
Transient analysis
Equivalent circuits
Wires (electric)
Ferromagnetic steels
Lightning transient analysis
Structural steels
Lightning current analysis
Magnetic material
Grounded structure
Equivalent electrical circuit
Magnetic conductors
Lighting transient current
Rational function approximation
Frequency dependent circuits
Time domain simulation
Three dimensional steel wire-power cable system
Radio base stations
Issue Date: 2018
Publisher: Institution of Engineering and Technology
Source: IET science, measurement and technology, May 2018, v. 12, no. 3, p. 301-307 How to cite?
Journal: IET science, measurement and technology 
Abstract: 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.
ISSN: 1751-8822
EISSN: 1751-8830
DOI: 10.1049/iet-smt.2017.0400
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