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Technical Specifications

Technical Specifications of the Windflow turbines

nacelle graphic

TURBINE MODEL

W33-500

W33-330

W33-250

TURBINE RATING

500 kW 330 kW 250 kW

1) BLADE

Make Wind Blades Ltd
Material Laminated wood/epoxy
Air brake Full-span pitch
Weight 900 kg

2) ROTOR

Number of blades 2
Rotor diameter 33.2 m
Rotor speed 48-51rpm 40–42rpm 40-42rpm
Swept area 866 m2
Hub height 30 m or 50 m
Orientation Upwind
Regulation Full-span pitch
Hub Teetering (pitch-coupled)
Weight 4,000 kg (hub and blades)

3) HYDRAULIC SYSTEM

3a. Power unit 7.5 kW axial piston pump
3b. Yawing 1.3°/ 2°/sec geared motor
3c. Pitch actuation Linear actuator
3d. Braking Fail-safe calliper
3e. Torque limiting Radial piston pump

4) GEARBOX

Type Hicks planetary/parallel TLG
No of stage 4
Overall ratio 30.9:1 37.5:1 37.5:1
Rated torque 114 kN.m

5) GENERATOR

Type Synchronous
Nominal power 500 kW 330 kW 250 kW
Speed 1,500 rpm
Voltage 415 V
Frequency 50 Hz

6) TOWER

Type Tubular
Height 29 m or 49 m

CONTROLLER

Make Bremca Industries Ltd
Cut in system Auto-synch
Logic system PLC

WEIGHT

Nacelle & rotor 13,700 kg

PERFORMANCE

Maximum power 500 kW 330 kW 250 kW
Low wind cut-in (steady wind) 5.4 m/s 4.6 m/s 4.6 m/s
Low wind cut-in (IEC Class A turbulence) 4.7 m/s 3.9 m/s 3.9 m/s
Rated power at (steady wind)
13.9 m/s 12.5 m/s 11.0 m/s
Rated power at (IEC Class A turbulence) 15.5 m/s 14.8 m/s 12.6 m/s
High wind cut-out 30 m/s 26 m/s 25 m/s

CERTIFICATION

Type approval Lloyd's Register
Turbine design IEC 61400-1 (edition 3) Class 1A
Quality accreditation ISO 9001: 2008