There have been a number of failures of overspeed protection schemes in recent years. This paper describes the basic protection schemes and the areas of weakness and provides an overview of the over speed losses that have taken place over the last several years as well as the causes. It presents some of the statistics regarding losses in the last 5 years and discusses some common themes. What does this data tells us? What are ways to improve the chances of avoiding these failures? What can owners and operators do to prevent them at their plants?

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