Feature Selection for Monitoring Erosive Cavitation on a Hydroturbine

• Main Authors: Seth W. Gregg, John P.H. Steele, Douglas L. Van Bossuyt
• Format: Article
• Language: English
• Published: The Prognostics and Health Management Society 2017-01-01
• Series: International Journal of Prognostics and Health Management
• Subjects: monitoring; hydroturbine; hydro power; cavitation; cavitation monitoring
• Online Access: https://papers.phmsociety.org/index.php/ijphm/article/view/2528

This paper presents a method for comparing and evaluating cavitation detection features - the first step towards estimating remaining useful life (RUL) of hydroturbine runners that are impacted by erosive cavitation. The method can be used to quickly compare features created from cavitation survey data collected on any type of hydroturbine, sensor type, sensor location, and cavitation sensitivity parameter (CSP). Although manual evaluation and knowledge of hydroturbine cavitation is still required for our feature selection method, the use of principal component analysis greatly reduces the number of plots that require evaluation. We present a case study based on a cavitation survey data collected on a Francis hydroturbine located at a hydroelectric plant and demonstrate the selection of the most advantageous sensor type, sensor location, and CSP to use on this hydroturbine for long-term monitoring of erosive cavitation. Our method provides hydroturbine operators and researchers with a clear and effective means to determine preferred sensors, sensor placements, and CSPs while also laying the groundwork for determining RUL in the future.