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ISO IEC/TS 61400-4-1:2026

Wind energy generation systems - Part 4-1: Reliability assessment of drivetrain components in wind turbines
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ISO IEC/TS 61400-4-1:2026

Wind energy generation systems - Part 4-1: Reliability assessment of drivetrain components in wind turbines

PUBLISH DATE 2026
ISO IEC/TS 61400-4-1:2026

This part of IEC 61400 specifies a method to calculate the design reliability of wind turbines gearboxes covered by IEC 61400-4, based upon failure modes where standardized calculation methods are publicly available.

Currently, not all failure mechanisms that occur in the field have accepted theoretical models. Therefore, the method only provides a quantitative assessment method of the failure mechanisms that can be described with accepted mathematical models for the complete gearbox, stages (functional units), field replaceable units, and individual components.

For the calculable failure mechanisms, it is possible to compare the reliability between different gearbox designs within the limitations of the theoretical models. The use of field-based statistical parameters can improve the accuracy of the calculated reliability.

The calculated design reliability can provide information for the lifecycle management strategy. However, this document does not provide trade-off decisions between higher design reliability and maintenance strategies (e.g. preventive or predictive maintenance). This document does not consider repairable system analysis.

Due to the lack of accepted theoretical models for some failure modes, the model can currently not predict the apparent failure probability in the field.

Neither this document nor IEC 61400-4 specify a minimum value of design reliability.

SDO ISO: International Organization for Standardization
Document Number IEC/TS 61400
Publication Date April 1, 2026
Language en - English
Page Count 40
Revision Level
Supercedes
Committee ISO/TC 60
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