Description
WTN 250 WindTechnik Nord 250kW
Industrial Wind Turbine For Sale
Two units available beginning Q1 – 2025
WTN 250 WindTechnik Nord
General Overview
- Model: 2010 WTN 250 WindTechnik Nord
- Commissioned: 2012 – only 12 years in operation
- Rated power 250kW (50Hz)
- Rotor diameter 30m
- Tower Height: 30m
- Service history available
- Location: Northern Ireland
- Reason for Sale: Repowering
WTN 250 WIND TECHNIK NORD
Harnessing two decades of expertise in wind turbine innovation, the WTN 250 is known for its enduring design and outstanding yearly generation excellence. The WTN 250 embodies its predecessors’ trusted, sturdy build while incorporating the latest advancements in wind technology. Engineered by German WindTechnik Nord, this turbine is tailored for high-velocity wind conditions typical in elevated areas, ensuring peak energy production and output.
The WTN 250’s consistent operational availability and production capacity, coupled with superior manufacturing standards, position it as an economically favourite option in the second-hand market. Its cost-effectiveness, and a high return on investment, underscores its appeal as a sound financial choice for 1st-time energy investors.
Rotor
- Cut-in 4m/s
- Rated wind speed 14m/s
- Cut-out 25m/s
- Type Three-bladed
- Diameter 30 m
- Swept area 707 m2
- Rotational speed 26/40 rpm
Blades
- Type: LM 13.4
- Material: glass-fibre
- Length 13,39m
Generator
- Type: Asynchronous
- Rated output: 50/250kW
- Voltage: 415V
- Frequency: 50Hz
Gearbox
- Type: Spur
- Ratio: 1:37.777
- Stages: 3
Tower
- Type: Steel, tubular – 30 metre
Brake system
- Aerodynamic Brakes: Tip brakes
- Activation: Hydraulic
- Mechanical Brakes: disc brakes
- Activation: Mechanical
DOWNLOAD WTN 250 WindTechnik Nord Noise Spec
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IMPORTANT NOTES
- Viewings are arranged only if a signed LOI (Letter of Intention) has been received.
- Time wasters and tyre kickers will strictly not be accommodated!
Call us today on ☎ +44 77 888 66 846
MWPS Global can assist in dismantling, worldwide shipping & transportation and full refurbishing and upgrade services at highly competitive prices.
MWPS Global works with highly skilled remanufacturers, refurbishers, and machinists. This ensures the re-manufactured equipment is properly restored to the original manufacturers’ specifications and is refurbished according to our high standards. Refurbished wind turbines offered by MWPS Limited are completely disassembled and thoroughly inspected and cleaned. Our highly experienced wind turbine refurbishment affiliates evaluate the condition of the reconditioned wind turbine and replace all worn parts. The main moving components will be replaced with new or better-than-new standards. The controls, gearbox, hub, generator, and hydraulic system are all thoroughly reconditioned and are either restored or replaced. All refurbished wind turbines come with a full technical report of the reconditioning work undertaken.
Additional Information WTN 250 WindTechnik Nord
Blade/ Rotor
The WTN 250 works with a 3-blade upwind stall-regulated rotor, with improved overall efficiency. A special placement on the frame reduces the effect of moments of rotation. The blades are made of reinforced polyester and are equipped with “fail-safe” tip brakes, that are activated simultaneously by centrifugal forces. The projected area of the blades is relatively small, which is responsible for a high survival wind speed. With a blade length of 13,4 m and a diameter of 30 m, the rotor of the WTN 250 has a swept area of 707 m2. The rotor speed is 40 rpm.
Hub
The hub is a steel cast GGG 40.3 and mounted to the rotor shaft flange. Correction of the pitch angle of the blades is possible by oval holes in the blade flanges.
Main shaft
The main shaft is a forged piece made of high-grade alloyed steel. It is mounted in two bearings, able to transfer all forces and moments to frame and gear.
Main bearings
Two long-time grease-lubricated bearings are the basis for a nearly noiseless operation of the main shaft The places where the main bearings are fitted to the frame are machined.
Gearbox
A heavy three-stage helical gear transforms the 40 revolutions of the rotor to the 1500 rpm of the generator. This gear is specially designed for the WTN 250 with a gear ratio of 37.8. An oil cooler is separately placed.
Coupling
The power of the rotor, transformed in the gearbox, is transmitted to the generator by an elastic coupling. With this method, no vibrations will reach the bearings of the generator, and a longer life is expected.
Brakes and emergency brake system
The turbine is equipped with two (2) independent fail-safe systems.
The blades are equipped with a simultaneously activated safety tip brake, and on top of these blades braking mechanisms, the WTG is fitted with a disc brake. The disk braking mechanism is supplied through two hydraulic fail-safe brake callipers, it activates by detecting a reduction of the voltage. The tip brakes are held in position by a hydraulic cylinder. In emergencies, a hydraulic valve is activated by centrifugal forces, and both brake systems are engaged, independent of each other.
Generator
The generator is a pole-changing asynchronous machine with a nominal output of 250 kW at 1 500 rpm respectively 50 kW at 1000 rpm. It is operating on a 400VAC level. A ventilator is cooling the outside of the machine.
Yaw-System
The yaw is representing the main advantage in modern wind technology and makes the WTN 250 superior, compared with other conventional engineering in the wind industry. The taken solution, designed and well-tested, is to arrange two gears in a way, that any space in the system is eliminated. These yaw gear systems incorporate both, a damping system to decrease forces induced by the turning forces of the rotor, and a brake system, while the yaw motors are stopped. This system is ideally suited for WTGs installed in multiples (wind farm applications) where the shadow effect of upwind placed WTGs is to blame for exposures to dynamic turning loads. Another feature of this yaw system is the automatic untwisting of the cables and an additional twisted cable switch for more safety.
Nacelle
The hot dip galvanized nacelle frame is constructed of welded steel beams that support the main shaft, gear, generator etc. The yaw ring is fitted to the bottom of the frame and allows the connection to the tower. The nacelle can be reached via a ladder inside the tower. The cover is made of galvanized sheets of steel.
Tower
The lattice tower is a new design specially made to reach all destinations around the world at low costs. All parts of the turbine are suitable in a 40 ft container. Alternative an edge and bolted tubular tower is available. With both towers, the hub height is 50 m so that the rotor of the turbine reaches a lower turbulence area. This will increase the output and the service life of the WTG. However – there are sites where only small heights are allowed so that there is still a 30 m welded tubular tower available. The microprocessor control system is placed at the bottom of the tower or in a special housing. A lockable door prevents unauthorized access. The WTG comes equipped with a safety belt and safety line, which provides secure climbing during installation and maintenance.
Control panel
All functions of the wind turbine are controlled utilizing a proven microprocessor. The computer stores several operational data while the turbine is operating and connected to the grid. If the WTG is erected in a wind farm, the turbines can be linked up to a computer management system. This design makes it possible to retrieve data and actual performance data from the wind turbines and allows machines to operate remotely. lf no management system is utilized, the same data can be read on the display mounted on the computer, which continuously checks all sensors and the safety system:
- – Grid control of Voltage, Frequency Phase equality
- – Overspeed control on the rotor that activates the disc brake
- – Thermal sensor in generator
- – Vibration sensor
- – Automatic untwisting of cables
- – Thermal relay for yaw gear motor
- – Automatic stop for worn brake pads
- -Automatic start-up in the event of grid failure
- – Self-diagnostic in case or failure. A display indicates a failure code.
- – Generator speed
- – Rotor speed
- – Yawing
- – Over speed
The control system also ensures gradual grid hook-up via thyristors on all three phases. The phase compensation is included in the main panel and allows a Cos. phi above 0,9. All electrical components are protected against lightning.
