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Shutdown of DCS due to the Coup de Fouet effect of lead acid batteries

Geraldo Bieler

Luiz A. Anderson

Claudio Conceição

José Luiz S. Neto

Due to a blackout of the utility’s electrical system, some UPS batteries of a oil refinery failed to feed their loads, even apparently having charge enough to supply their loads. Several tests were performed and the conclusions led to “Coup de Fouet” effect, an intrinsic phenomenon of lead acid batteries. This paper discusses the risks of this effect for critical systems in continuous processes and the actions taken to mitigate the problem, including some maintenance procedure recommendations for coexisting with it.

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