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A transmission line tower model taking into account the distribution of the current along the metal structure: application of the model in predicting occurrence of the backflashover

Grant number: 14/18551-6
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2015
Effective date (End): October 16, 2018
Field of knowledge:Engineering - Electrical Engineering - Power Systems
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal researcher:Sérgio Kurokawa
Grantee:Anderson Ricardo Justo de Araújo
Home Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil
Associated scholarship(s):16/09139-0 - MODELING TALL TRANSMISSION TOWERS FOR PREDICTING OCCURRENCE OF THE BACKFLASHOVER IN POWER SYSTEMS, BE.EP.DR

Abstract

This Project proposes a transmission line tower model to be used for analyzing lightning overvoltages on transmission towers. The model considers the transmission tower as being a vertical transmission line. Taking into account this tower model, the currents and voltages in frequency domain will be calculated by using the Numerical Electromagnetic Code (NEC-2). Then, by using simulated currents and voltages it will be possible to calculate the tower impedance seen from the top of the transmission tower. The impedance will be approximated by a rational function that has, in time domain, an equivalent circuit representation (circuit constituted by resistances, inductances and capacitances). This equivalent circuit is the transmission tower model developed directly in time domain and it can be easily used in softwares such as Alternative Transients Program (ATP). The proposed model can be used without softwares such as ATP. In this case, the currents and voltages of the equivalent circuit before mentioned must be written as being state equations. This way, the simulations of lightning overvoltages can be evaluated by using any computational language. The main advantage of the proposed model is the fact that it takes into account the current distribution on each segment of the modeled geometry that represents the transmission tower. Therefore the developed power transmission tower model can be used to simulate more accurately electromagnetic transients during the lightning strikes on transmission towers. Therefore, taking into account the reduction of the failures in the insulators, there will be a reduction of the number of outages through the backflashovers. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE ARAUJO, ANDERSON R. J.; KUROKAWA, SERGIO; SEIXAS, CLAUDINER M.; KORDI, BEHZAD. Optimization of tower-footing grounding impedance for guyed-V transmission towers. Electric Power Systems Research, v. 177, DEC 2019. Web of Science Citations: 0.
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
ARAÚJO, Anderson Ricardo Justo de. Transmission tower representation directly in the time domain. 2018. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Ilha Solteira Ilha Solteira.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.