4MW Series Wind Turbine

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The 4MW wind turbine series was introduced by Siemens, the largest producer of turbines in the world. These offshore turbines are intended for large scale wind farms. The efficiency and power output of these windmills is outstanding and they boast an extremely long useful lifetime.

SWT 4.0-130 power curve

Technical specification

Operating data
Rated power［kw］	4000
Cut-in wind speed［m/s］	3.5
Cut-out wind speed［m/s］	32(Across High Wind Speeds)
IEC Level	IEC IB
The largest 3s wind［m/s］	70
Operating temperature(℃)	-10~ 40(Across High Temperatures)
standstill temperature(℃)	-20~ 50
Rotor speed range［rpm］	5~14
Rotor speed range［rpm］	12
Rated wind speed［m/s］	11-12
Life cycle［year］	20
Surface color	Light gray RAL 7035
Rotor weight［t］	100
Hub weight［t］	47
Nacelle weight［t］	140

Rotor
Rotor diameter［m］	130
Swept area［㎡］	13300
Blade Number	3
Rotor tilt［°］	6
Rotor cone angle［°］	5.5

Blade
Type	B63
Blade length［m］	63.45
Aerodynamic configuration	Siemens patent airfoil DU-97-W-300
Blade material	GRE

Pitch System
type	Hydraulic pith system
Pitch speed［°/s］	7
Pitch bearing	four-point contact ball

Drive chain
connection	Rotor hub-rotor shaft: flange;
Gearbox type	3-stage parallel / Helical
gearbox gear ratio	1:119
gearbox lubricating system	force
gearbox oil［L］	~750
gearbox oil filter	Split type oil cooling system
Cooler gearbox	Oil-water-wing cooler

Generator
Type	Squirrel cage asynchronous generator
Rated power［kw］	4250
Rated speed［rpm］	600~1800
rated voltage［v］	750
grid frequency［Hz］	50/60
insulation	F
protection	IP54
cooling	air air cooler

Converter
type	Four quadrant full power
apparent power［KVA］	4000
rated voltage［v］	690
grid frequency［Hz］	50/60
Switch-over	PWM
type of cooling	Water cooling

Yaw system
type	Active yaw
yaw bearing	Transmission ball bearing
yaw motor	6 sets with gear motor
yaw rate［°/min］	21.6(0.06 rpm)

Braking system
type	The pitch type
Main braking	Hydraulic variable propeller braking
Mechanical braking	High-speed spindle hydraulic disc caliper brake

Loading components
Hub	Nodular cast iron
Rotor bearing	Spherical roller bearing
Rotor	alloy steel
front chassis	Nodular cast iron
back chassis	steel
Spinner(Diversion cover)	Steel/aluminum

Tower
type	cylindrical
Wheel hub height［m］	90m or Customize based on the site
antiseptic	anticorrosion painting
anticorrosion level	Following the ISO12944 standards, according to the wind field environment.
barrel	Structural steel
flange	T or L