The WES250 is a two bladed, high performance, reliable midsize 250kW wind turbine with a rotor diameter of 30 meters.
The mechanical part of the WES250 is based on the original, proven design from 1983. For the electrical parts providing power conversion and control, the latest technology is used.
WES250 turbines are manufactured and exported by WES in the Netherlands, and are sold, installed and maintained all over the world by a global network of certified and trained dealers.




WES250 General

Supplier/manufacturerWES BV
Life expectancy20 years
MaintenanceTwice a year
Rated power250 kW
Cut in wind speed<3 m/sec. (6.7mph)
Cut out wind speed25 m/sec. (56mph)
Rated wind speed13 m/sec. (29mph)
Survival wind speed60 m/sec. (134mph)
Passive power regulationPitching (blade-angle adjustment)
Active power regulationFully variable back-to-back IGBT system
Noise emission at 8 m/s45dB(a) at 100m
Operating temperaturesFrom -20°C up to +40°C

WES250 Applied standards

Degree of protectionIP55
StandardsNEN1010 (electrical) NEN-EN50308 (safety) NEN-EN6096 (wind turbines) UL1741 (anti islanding) NEN-EN-IEC 60204-1 (cabinet)

WES250 Electrical

Grid voltage400V ±10%
Grid frequency50/60Hz ±3Hz
# Phases3 phase + neutral
Specific power354 W/m2
Converter typeBack-to-back IGBT converter

WES250 Blades

Number of blades2
Diameter30 m
Angle of the main shaft7° with horizontal
Swept area707 m2
SpeedVariable 35 -75 rotations per minute
Power regulationPassive pitching (blade-angle adjustment)
Min. blade-angle1
Flapping angle183 -170,5°
Blade length13,4 m
Weight (1 blade)315kg
Chord500 – 1.200mm

WES250 Gearbox

BrandSiemens (Flender)
Number of stages2
Weight1850kg (incl. oil)

WES250 Generator

Nominal power250 kW
Number of poles6
Nominal voltage230/400 volt
FrequencyVariable: 25 - 75 Hz.
ProtectionIP 55

WES250 Tower

Number of sections3 or 4
Tower height30, 39, 48m
MaterialPainted steel
Location ladderInternal

WES250 Controller

Control byIPC (Beckhoff)
Remote monitoringYes
Data loggingOptional

WES250 Yaw-system

Yaw systemActive
Signal fromWind vane
Driven byElectro motor with worm-wheel reduction
Power yaw-motor2x 1,5 kW
Yaw speed0,77°/sec.
Yaw bearingSingle ball bearing; externally geared (Rothe Erde)
Yaw-brakesConstant friction-brakes; 4 pcs.

WES250 Safety

First safety systemPassive blade pitching
activated by:rotor speed (70 rpm)
Second safety systemYawing out of the wind
activated byRotor speed (>90 rpm)
Excessive vibrations
Failure anemometer or wind vane
Grid failure
Fault in yawing system
Blocking system
Rotor blocking systemPin in high speed shaft; for service purposes

WES250 Weights

Rotor incl. blades3.600 kg
Nacelle excluding rotor7.100 kg
Control cabinet600 kg
Tower12.500 kg (30 m. tower)

WES250 Material specifications

BladesCarbon and fibre glass reinforced epoxy
TowerSteel (painted)
FoundationConcrete Block with steel anchor