Proposta Alternativa Para a Representação Modal de Linhas Trifásicas Não Idealmente Transpostas que Possuem um Plano de Simetria Vertical (Alternative proposal for Modal Representation of a Non-transposed Three-Phase Transmission Line with a Vertical Symmetry Plane)

Sérgio Kurokawa (kurokawa@dee.feis.unesp.br)3, Rodrigo Serra daltin (rodrigo_daltin@superig.com.br)3, Afonso José Prado (afonsojp@uel.br)1, José Pissolato (pisso@dsce.fee.unicamp.br)2, Luiz Fernando Bovolato (bovolato@dee.feis.unesp.br)3


1Universidade Estadual de Londrina
2Universidade Estadual de campinas
3Universidade Estadual Paulista Júlio de Mesquita Filho

This paper appears in: Revista IEEE América Latina

Publication Date: June 2009
Volume: 7,   Issue: 2 
ISSN: 1548-0992


Abstract:
The objective of this paper is to show an alternative representation in time domain of a non-transposed three-phase transmission line decomposed in its exact modes by using two transformation matrices. The first matrix is Clarke's matrix that is real, frequency independent, easily represented in computational transient programs (EMTP) and separates the line into quasi-modes a, b and zero. After that, Quasi-modes a and zero are decomposed into their exact modes by using a modal transformation matrix whose elements can be synthesized in time domain through standard curve-fitting techniques. The main advantage of this alternative representation is to reduce the processing time because a frequency dependent modal transformation matrix of a three-phase line has nine elements to be represented in time domain while a modal transformation matrix of a two-phase line has only four elements. This paper shows modal decomposition process and eigenvectors of a non-transposed three-phase line with a vertical symmetry plane whose nominal voltage is 440 kV and line length is 500 km.

Index Terms:
electromagnetic transients analysis, frequency domain analysis, time domain analysis, transmission line matrix methods   


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