Etxegarai, A.Valverde, V.Eguia, P.Perea, E.2020-06Etxegarai , A , Valverde , V , Eguia , P & Perea , E 2020 , ' Study of Useful Life of Dry-Type WTSU Transformers ' , Renewable Energy and Power Quality Journal , vol. 18 , 414 , pp. 505-509 . https://doi.org/10.24084/repqj18.4142172-038Xresearchoutputwizard: 11556/1002Publisher Copyright: © 2020, European Association for the Development of Renewable Energy, Environment and Power Quality (EA4EPQ). All rights reserved.Dry-type transformers are rapidly becoming popular as wind turbine step-up (WTSU) transformers, especially in offshore wind farms. Cast resin transformers are not flammable and are also resistant to moisture. However, their thermalelectrical degradation must be carefully analysed given the special conditions of wind farm installations. The present paper studies the remaining useful life (RUL) calculation of dry-type WTSU transformers based on the most thermally stressed location i.e. the winding hot-spot. The estimation of the loss of life of the transformer can be used for diagnostic and prognostic monitoring purposes in the framework of digital twins. The methodology is then applied to a typical WTSU load profile and the impact of several transformer characteristics and operating conditions are compared to the reference case.5953018enginfo:eu-repo/semantics/openAccessjournal article10.24084/repqj18.414Wind energyDry-type transformerHot spot temperatureLoss of lifeDigital twinWind energyDry-type transformerHot spot temperatureLoss of lifeDigital twinRenewable Energy, Sustainability and the EnvironmentEnergy Engineering and Power TechnologyElectrical and Electronic EngineeringSDG 7 - Affordable and Clean EnergyFunding InfoThe authors gratefully acknowledge the support of the Basque Government (project ELKARTEK KK2018/00096 and GISEL research group IT1191-19), as well as of the University of the Basque Country UPV/EHU (research group funding GIU18/181).The authors gratefully acknowledge the support of the Basque Government (project ELKARTEK KK2018/00096 and GISEL research group IT1191-19), as well as of the University of the Basque Country UPV/EHU (research group funding GIU18/181).http://www.scopus.com/inward/record.url?scp=85091792909&partnerID=8YFLogxK