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• Wind in the World • Wind in Russia • Wind classes

Wind classes

Wind classes according to International classification, and wind density:

  10 m (33 ft)
50 m (164 ft)
 10 m (33 ft)
50 m (164 ft)
Wind Power Class
Wind Power Density, (W/m2)
Speed, m/s (mph)
Wind Power Density, (W/m2) 
Speed, m/s (mph)
 1 <100 <4.4 (9.8)<200  <5.6 (12.5)
 2100 - 1504.4 (9.8)/5.1 (11.5)200 - 3005.6 (12.5) - 6.4 (14.3)
 3150 - 200 5.1 (11.5) - 5.6 (12.5)300 - 4006.4 (14.3) - 7.0 (15.7)
 4200 - 250 5.6 (12.5) - 6.0 (13.4)400 - 5007.0 (15.7) - 7.5 (16.8)
 5250 - 300 6.0 (13.4) - 6.4 (14.3)500 - 6007.5 (16.8) - 8.0 (17.9)
 6300 - 400 6.4 (14.3) - 7.0 (15.7)600 - 8008.0 (17.9) - 8.8 (19.7)
 7 >400 >7.0 (15.7) >800 >8.8 (19.7)

The wind speed according to Beaufort scale and its influence on the Wind Turbine (WT) operation, is shown in the Table:

Beaufort scale

Wind speed, m/sec

General description

Detailed description

Effect on WT

Conditions for WT operation in this range of wind speed

0

 0,0-0,4 Calm Smoke from pipes is vertical No No

1

 0,4-1,8 Light air Smoke from pipes has some angle with vertical, weather-vane are motionless. Some ripples on water No No

2

 1,8-3,6 Light breeze Face feels the wind, leaves rustle, water is choppy Wind rotor starts rotating Not acceptable

3

 3,6-5,8 Gentle breeze Leaves are oscillating, light flags are fluttering, some white caps on water WT starts producing power Satisfactory for alternator

4

 5,8-8,5 Moderate breeze Leaves are oscillating, the dust and small papers fly, lots of white caps on water Power of WT reaches 50% of nominal Good for alternator

5

 8,5-11 Fresh breeze Broad-leaved trees start swinging, all waves are in white caps Power of WT reaches 75% of nominal Very good

6

 11-14 Strong breeze Big branches of trees are swinging, telephone wires are bussing, big white caps on waves Power is closed to maximum Perfect for WT. Aerodynamic brakes start operating

7

 14-17 Moderate gale All trees are swinging, foam is flying from waves Maximum power

Perfect for WT. Aerodynamic brakes operate

8

 17-21 Fresh gale Branches of trees are breaking, it's hard to go against the wind, foam flocks are flying on the water Maximum power

Perfect for WT. Aerodynamic brakes operate

9

 21-25 Strong gale Small destructions, smoke pipes fall down All Horizontal Axis Wind Turbines (HAWT) stop operating Acceptable. WT of SRC-Vertical continue operating

10

 25-29 Whole gale Serious destructions, trees pull out together with roots Limit loading for HAWT Acceptable. WT of SRC-Vertical continue operating

11

 29-34 Storm Great destructions Damage of some Wind Turbines Acceptable. WT of SRC-Vertical continue operating

 12

 More than 34 Hurricane Devastating destructions Serious dmamge of Wind Turbines, some fall down Acceptable. WT of SRC-Vertical continue operating

-

 35-60 Hurricane Consequences are unpredictable HAWTs fall down Quite acceptable. WT of SRC-Vertical can fall down on appr. 60 m/sec


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