Análise do comportamento de uma linha de um pouco mais de meio comprimento de onda sob diferentes condições de operação em regime permanente e durante a manobra de energização / Analysis of the behavior of an isolated transmission line with a little more than half wave lenght for different operating conditions in steady state and during the energization manouver

Rodrigo Fernandes Vidigal

This work presents an analysis of the behavior of an isolated transmission line with a little more than half-wave length (2600 km) on fundamental frequency, 60 Hz, connected to an infinite busbar for different operating conditions. The voltage and current profiles for different loading conditions are monitored along the line. An analysis of the influence of the power factor of the transmitted energy on the voltage and current profiles along the line is performed. The losses along the line for different levels of transmitted power are measured and a method to minimize these losses is presented. A systematic review methodology in the fundamental frequency of a power system identifying the critical conditions is also presented. This methodology is applied to a system formed by 500 kV existing transmission lines in the Brazilian electrical system, which are interconnected forming an AC-link of 2600 km in order to represent a transmission line of a little more than half-wave length. The analysis made in this paper means to verify the system behavior in the presence of different types of short circuits at different points along the line. After systematic analysis in steady state, the extreme conditions can be simulated in an electromagnetic transient program. Thus the behavior of the isolated line connected to an infinite busbar in the presence of different types of short circuits is discussed and the main results are presented in this paper. The 2600 km AC-link formed by actual Brazilian 500 kV lines was used to simulate the trunk energization. The simulations included different techniques such as direct closure energization, the use of a pre-insertion resistor and the controlled switching. For each alternative it was analyzed the transient overvoltage profile along the line. The simulations were done with the software ATP and PSCAD / EMTDC

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