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.