Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13830
Title: Lightning response of transmission lines and impulse behavior of concentrated grounds
Authors: WANG JUNPING
Keywords: Lightning, flashover, concentrated grounds, breakdown, ionization,sparking
Issue Date: 28-Mar-2004
Source: WANG JUNPING (2004-03-28). Lightning response of transmission lines and impulse behavior of concentrated grounds. ScholarBank@NUS Repository.
Abstract: Two aspects of the lightning response of power transmission systems have been studied in this thesis. Firstly, the phenomenon of multiple flashovers in multi-circuit and multi-phase lines after a lightning strike is investigated. This leads to the identification of multiple flashovers across the same phase in different towers. Computer simulations are performed to demonstrate and study this occurrence of multiple flashovers. This result has not been evident in previous analyses by many researchers.Secondly, a dynamic model which describes the impulse behavior of concentrated grounds at high currents is described. This model is an extension of previous models in that it can successfully account for the surge behavior of concentrated grounds over a much wider range of current densities. It is able to describe the well-known effect of ionization of soil as well as the observed effect of discrete breakdowns and filamentary arc paths at much higher currents. Results of verification against experimental results are also presented.
URI: http://scholarbank.nus.edu.sg/handle/10635/13830
Appears in Collections:Master's Theses (Open)

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