Considering on the ground reflection effect on the electromagnetic fields due to lightning channel
Lightning electromagnetic fields are important issues for the evaluation of lightning induced overvoltage on power lines and for setting the appropriate protection level for power networks. Such electromagnetic fields are strongly dependent on lightning return stroke currents at different heights...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Korean Institute of Electrical Engineers
2013
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| Online Access: | http://psasir.upm.edu.my/id/eprint/28636/1/Considering%20on%20the%20ground%20reflection%20effect%20on%20the%20electromagnetic%20fields%20due%20to%20lightning%20channel.pdf http://psasir.upm.edu.my/id/eprint/28636/ http://www.jeet.or.kr/LTKPSWeb/pub/pubissue.aspx?puseq=39 |
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| Summary: | Lightning electromagnetic fields are important issues for the evaluation of lightning
induced overvoltage on power lines and for setting the appropriate protection level for power
networks. Such electromagnetic fields are strongly dependent on lightning return stroke currents at
different heights along the lightning channel. On the other hand, the ground reflection factor due to the
difference between the return stroke channel impedance and the equivalent ground impedance at
channel base can have an effect on the shape of the return stroke currents by entering additional
reflected currents into the channel. In this paper, the effect of the ground reflection factor on the return
stroke currents at different heights along a channel and the electromagnetic fields associated with the
lightning channel at close distances are considered. Moreover, the behavior of the electromagnetic
fields versus the reflection factor changes and the radial distance changes are considered and the
results are discussed accordingly. The results illustrate that the reflection factor has a direct
relationship with the values of the electromagnetic fields while this is usually ignored in earlier studies |
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