Calculo dos parametros de linhas de transmissão trifasicas atraves das tensões e correntes em seus terminais / Calculation of parameters of thress-phase transmission lines through voltages and currents in their terminals

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The objective of this work is to calculate the longitudinal and transversal transmission line parameters using phase currents and voltages. Developed equations are used, in the modal domain, considering current and voltages found between a line terminal and an open line terminal, and a short-circuit terminal. . Initially, the basic transmission line theory is presented assuming that these lines are best represented by distributed parameters model. Therefore, through the analysis of electric circuits and Kirchhoff s laws , second order differential equations for voltage and current are found, which characterizes the line transmission. Next it is shown the method to calculate the line parameters, which uses the concept of open circuit and short-circuit equivalent impedance when one of the terminals is open or in short-circuited respectively. Using the Toolbox of MatLab, SimPowerSystem, estimated currents are simulated in a three-phase transmission line of 330 kV, 440 kV and 500 kV, all with the length of 500 km. The found values are used to calculate parameters of lines transmission and to compared them with their real values, showing that the calculation is possible and that the error obtained with this method is smaller than an error between the real line parameters after construction and those of existing project in the data base of companies

ASSUNTO(S)

analise modal modal analysis energia eletrica - transmissão electric power transmission electric networks linhas eletricas aereas redes eletricas overhead electric lines

ACESSO AO ARTIGO

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