Modeling and Analysis of Tower Protection Performance in Order to Coordinate with Environmental Conditions Response and Security Constraint Unit Commitment
Subject Areas : electrical and computer engineeringM. Yahyaabadi 1 * , A. Sadoughi 2
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Keywords: Communication tower antenna charge simulation method lightning rod upward leader,
Abstract :
رIn this paper, effective parameters on lightning performance of communication tower are analyzed. The effect of communication tower height, Influence of weather conditions and adjacent structures are investigated. A 3-D numerical analysis model based on charge simulation method is applied to calculate the probability of shielding failure and to determine the number of direct lightning strokes to antenna. The communication tower, lightning rod, downward descending leader and upward leaders are modeled by different shapes of charges. For each of the numerous points of all the space above the tower and for different values of lightning current, downward lightning leader is considered to be initiated, and it is distributed step by step until final jump. The electric field around the grounded objects is calculated and upward leader inception criterion is checked in each step. If this criterion were approved for a point, an upward leader would be initiated from that point and then the distribution of upward leader would continue. Upward leaders might be initiated from more than one point but only one of them could strike to downward leader. This process will continue for different conditions and in every situation all the results are analyzed and evaluated.
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