Abstract
An optimal lightning protection scheme for a substation using shielding wires is investigated in this paper through computer software analysis. An economic approach is utilized by choosing a reasonable trade-off between protection, the number of shielding wires and the heights of them from the ground. This study is initially applied to a simple two-wire system and then extended to a sample substation. The solution for each problem is executed in MATLAB and 3-D realization is shown.
Highlights
Faults and damages in substations are the culmination of sundry factors each of which play a significant role in the shielding failures among which lightning is one of the most important one
The user can define the specific margin between the highest part of the equipment and the protection level defined by shielding wires
An algorithm has been developed in MATLAB in order to design a lightning shielding protection system for substations using shielding wires
Summary
Faults and damages in substations are the culmination of sundry factors each of which play a significant role in the shielding failures among which lightning is one of the most important one. The velocity of the stepped leader is slow, about 0.1% of the speed of light As this stepped or downward leader reaches near the earth, an upward leader or return stroke start progressing to meet the downward leader. The speed of this stoke is about 10 to 30% of light which makes it possible to be observed by naked eye. One flash may consists of up to 54 stokes; the average is three stokes per flash
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