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Partial Safety Factors N * N N N N A A * * N N * A N N A N * A T A

of
Type Analysis U F U U U U U U F F U U F U U U U U F U U U

fault of
network electrical loss including faults

events electrical of internal fault system network connection

extreme loss or preceding or electrical electrical or electrical network misalignment

Conditions of extrapolation fault system system internal or network protection, loss electrical yaw

Other For Control Protection External electrical Control, including of Loss Extreme Source: International Electrotechnical Commission. Wind Turbine Part 1 Design Requirements . Geneva, 2005. IEC 61400-1 Edition 3. With permission

+ 2m/s the

V out
V out
V out < V out < V hub − 2m/s, V r , V r V out < V out < V hub ± 2m/s, V out V out < V out < ± 2m/s, V out ± 2m/s, V out V out < ± 2m/s, V out ± 2m/s, V out period recurrence period recurrence period recurrence period recurrence by stated period recurrence
<
Condition V hub < V hub < < V in < V r = V hub V hub < < V r = V hub < V hub < V r = V r = V hub < V r = V r = 50-year 50-year 1-year 0.7 V ref < 1-year be to V maint manufacturer 1-year 61400-1

Wind V in NTM NTM V in ETM V hub < ECD V in EWS V in NTM V in NTM V hub EOG V in NTM V in NWP V hub EOG V hub EDC V in NWP V hub EOG V hub NTM EWM EWM EWM V hub NTM EWM NTM EWM IEC
from

occurrence idling) maintenance Cases

plus shutdown or still conditions Load
production production shutdown (standing fault and assembly, Design

Design Situation Power Power fault of up Start Normal Emergency Parked Parked Transport repair and from IEC. 9-4 TABLE

187