Resumo

MARTINEZ GARCIA, Antonio et al. Determination of the causes of disconnection during the synchronization of some diesel units. Energética [online]. 2020, vol.41, n.2  Epub 31-Ago-2020. ISSN 1815-5901.

The research carried out to determine the causes of disconnection during the synchronization and load taking of some 1 MW diesel engines from the Guascor firm, due to poor operation of the piston failure protection, is presented. The natural mechanical modes of oscillation of the system were determined for any working regime prior to the appearance of the phenomenon. The oscillations produced were compared with those existing when a piston failed in these units. The existence of low oscillation mechanical modes associated with the units located in the western part of the country was demonstrated, with a frequency close to 1 Hz, verifying that the amplitudes of these oscillations could cause the false operation of the protection against piston failure. As a result, the recommendations made to solve the problems detected and the results obtained are listed.

Palavras-chave : Stability of small signals; damping; natural oscillation modes.

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