International Standards and Conformity Assessment for all electrical, electronic and related technologies

TC 88

Wind energy generation systems

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PT 61400-26 Project Leader & Members

Project Leader

Mr Robert W Sherwin
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Mr Jan Munksgård BaggesenDK
Mr Pavel BezroukikhRU
Mr Werner BohlenDE
Mr Guillermo Carrascal LozanoES
Mr Víctor Cuadro UrunuelaES
Mr Harald DeckerDE
Mr Wallace EbnerUS
Mr Nicolas GirardFR
Mr Eugenio Gómez SantiagoES
Mr Christopher GrayAT
Mr Keir HarmanGB
Mr Roger R HillUS
Ms Anja HovgaardDK
Mr Knud JohansenDK
Mr Sookrae KimKR
Mr Namho KyongKR
Mr Peng LICN
Mr Zhiyong LiCN
Mr Takatoshi MatsushitaJP
Ms Karen Meyer-TruelsenDE
Mr Peter NachbaurAT
Richard NicholDK
Ms María Pineda JimenoES
Mr Frank Joseph PribilUS
Mr Sigi PsutkaAT
Mr Niels RabenDK
Mr Jörn RassowDE
Mr Donald RogersUS
Mr Michael RüterDE
Mr Anton SimmonsGB
Mr Riaan SmitZA
Mr Ryoichi TakemotoJP
Mr Hao TangCN
Mr Yukinobu UchidaJP
Mr Michael wilkinsonGB

Title & Task

PT 61400-26

Availability for wind turbines and wind turbine plants


The technical specification shall define generic terms of wind turbine systems and environmental constraints in describing system and component availability, lifetime expectancy, repairs and criteria for determining overhaul intervals. Ideally the specification shall define terminology and generic terms for reporting wind power based generating unit reliability as well as availability measurement.

A generating unit includes all equipment up to the termination point defined in the distribution code (grid code) agreed between the generation party and the distribution / transmission party. Reliability encompasses measurement of the ability of the wind turbines to perform their intended function. Availability measurements are concerned with fractions of time a unit is capable of providing service, taking environmental aspects into account. Environmental aspects would be wind and other weather conditions, as well as grid and substation conditions.

In case further common definitions are required, coordination with other groups should be undertaken - to obtain a set of definitions relevant to electricity generation using wind power, consistent with IEV415. Adoption of IEEE 762 (2006) as a template for the specification and the opportunity to collaborate with the North American Electric Reliability Corporation (NERC) Generating Availability Data System (GADS) shall receive due consideration.