Publication Date:
2018-03-09
Description:
In order to solve the damage and interference problems to the electronic devices, which are induced by over voltage excited by the coupling process between lightning electromagnetic wave and overhead lines, the lightning tunnel is set to be equivalent to a radiant wire antenna, Based on the integration model to lightning return stroke tunnel, transmission line and ground, we take advantage of the derived formula gotten from the transmission line model, by combing the theoretical and experimental methods, we conduct a comparative analysis on the coupling process between natural /simulated lightning and overhead line. Besides, we also calculate the amplitude and energy of over-voltage which is caused by the coupling process between lightning electromagnetic wave and overhead lines. Upon these experimental results, we can draw several conclusions as follows: when the amplitude of the lightning current in the tunnel is between 5 kA to 41 kA, it takes on an excellent linear relation between the amplitude of over voltage and the magnitude of the lightning current, the relation between coupling energy and magnitude of the lightning current takes on an exponential trend. When lightning wave transmits on the transmission lines, the high order mode will be excited. Through analysis on the high order mode's characteristics, we find the theoretical analysis is consistent with the experimental results, which has a certain reference value to the protection on overhead lines.
Print ISSN:
0048-6604
Electronic ISSN:
1944-799X
Topics:
Geosciences
,
Physics
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