Proteção de linhas de transmissão de corrente alternada baseada em ondas viajantes utilizando um terminal
In this work, the traveling wave protection principles are investigated and two oneterminal transmission line protection method based on traveling waves are proposed. The first method is dependent of the first wave reflection, whereas the second one is based on modal waves detections and does not...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/24975 |
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| Resumo: | In this work, the traveling wave protection principles are investigated and two oneterminal
transmission line protection method based on traveling waves are proposed. The
first method is dependent of the first wave reflection, whereas the second one is based on
modal waves detections and does not require wave reflections, however, is valid only to
earth-faults. The effect of the sampling frequency on the protection is considered, what
until then has not yet been investigated for one-terminal methods. In contrast to the high
sampling frequencies normally adopted in one-terminal-based methods, procedures for
determining the minimum sampling frequency are defined. In addition, classical problems
inherent to protection based on traveling waves, such as the occurrence of faults
near the line terminals and the estimation of the waves velocity, are detailed equated and
solutions to such problems are presented. The methods were evaluated by means of computational
simulations and the results show that they have an operation time far below the
conventional methods. They also demonstrate that the method based on the wave reflections,
despite the good results obtained, can present difficulties for its application, since it
depends on the correct detection of the wave reflected in the fault point, since the method
based on modal waves is reliable, but applicable only to earth-faults. |
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