科研之友
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摘要
Lightning is the main reason for the trip of transmission line.Lightning protection measures.Lightning over-voltage accurate simulation method,basic physical process of lightning and its equivalent method is the focus of power system lightning protection research.The theoretical research and simulation calculation for of inductive lightning rod from the view of dispersion theory are carried out in the paper to make its lightning protection mechanism clear,and The influence of material properties on the attenuation constant and the phase constant of electromagnetic wave is analyzed in the paper.A simulation model of transmission line with lightning protection performance is established through electro-magnetic transient program PSCAD/EMTDC as well as the chain equivalent circuit model of distributed capacitance in high frequency.The simulation of the installing of inductive lightning rod at the top part of the tower is conducted to find the influence of the structure and material characteristics on the lightning counterattack voltage,so as to test its lightning protection effect.The combining of the theory of dispersion and the electromagnetic transient simulation confirms the lightning protection mechanism of the inductive lightning rod.
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