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Study on Lightning Protection and Lightning Induced-Voltages Estimation
Date Issued
2004
Date
2004
Author(s)
Cheng, Mei-Chung
DOI
zh-TW
Abstract
For a country situated at the subtropical zone, such as Taiwan, lightning occurs very often, especially in summer, when there are thunderstorms. When the lightning hit the overhead-lines, it would inject the huge energy into overhead-lines. Outage by surge through overhead-lines would decrease power quality.
Lightning can be divided into many types. The one most threatening to people and structure is the cloud to ground discharged. There are two kinds of cloud to ground discharged. One is upward, and the other is downward. The downward lightening happens more frequently. At present, Lightning rods and Lightning Eliminators are the more popular devices of lightning protection. My research focus on compared Structure, theory, protection effect of those devices, and collected standards, experiments from foreign as well as domestic.
Another research topic is evaluated lightning induced voltages on nearby overhead-lines. Lightning is a transient, high-current discharge whose path length is measured in kilometers. During flash, neighbor electromagnetic field change violently, that would induce voltages on close-by metal. To find induce-voltages on overhead-lines must be transformed lightning phenomenon into numeric equation first. Apply Maxwell-equations to equal space electromagnetic, using Agrawal Model to describe coupling between overhead-lines and electromagnetic. Transmission equation can find the solution of induce-voltages by lightning. Finally, this thesis applied above solutions will offer a program by MATLAB. It can find solutions quickly and correctly in different conditions.
Lightning can be divided into many types. The one most threatening to people and structure is the cloud to ground discharged. There are two kinds of cloud to ground discharged. One is upward, and the other is downward. The downward lightening happens more frequently. At present, Lightning rods and Lightning Eliminators are the more popular devices of lightning protection. My research focus on compared Structure, theory, protection effect of those devices, and collected standards, experiments from foreign as well as domestic.
Another research topic is evaluated lightning induced voltages on nearby overhead-lines. Lightning is a transient, high-current discharge whose path length is measured in kilometers. During flash, neighbor electromagnetic field change violently, that would induce voltages on close-by metal. To find induce-voltages on overhead-lines must be transformed lightning phenomenon into numeric equation first. Apply Maxwell-equations to equal space electromagnetic, using Agrawal Model to describe coupling between overhead-lines and electromagnetic. Transmission equation can find the solution of induce-voltages by lightning. Finally, this thesis applied above solutions will offer a program by MATLAB. It can find solutions quickly and correctly in different conditions.
Subjects
雷擊保護
雷擊感應電壓
閃電
Lightning Induced-Voltages
Lightning
Lightning Protection
Type
thesis
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Name
ntu-93-R91921064-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):67aab2508e00ea86b23d440fcf5703b7