The equipment of hydroelectric power plants has been improving typically by using digital technology and eliminating oil for lubrication and control. According to the investigation executed by the committee of IEEJ, a fault/trouble happened in one equipment in a hydroelectric power plant has decreased to less than once in 5 years due to such improvement and advancement of design and manufacturing technologies. As for maintenance, changing to the condition based maintenance from the time based maintenance has been in progress. Developing diagnostic technologies and the analysis of operating data to understand the condition of the equipment are important.
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