Rotor

The rotor of the SWT-2.3-93 turbine is a three-blade cantilevered construction, mounted upwind of the tower. The power output is controlled by pitch regulation.

Blades

The blades are made of fiberglass-reinforced epoxy resin and are manufactured by Siemens in a single operation, using our patented IntegralBlade? process. No glue joints between spars and shells, no weak points, no easy access for water or lightning. The aerodynamic design of the blades represents state-of-the-art wind turbine technology, and the blades have been thoroughly tested at Siemens' test site under both static and dynamic loadings. The blades are mounted on pitch bearings and can be feathered 80 degrees for shutdown purposes. Each blade has its own independent fail-safe pitching mechanism capable of feathering the blade under any operating condition, and allowing fine-tuning to maximize power output.

Gearbox and Brake

The gearbox is a custom-built three-stage planetary-helical design, mounted on the nacelle with flexible rubber bushings, thereby providing a compact high-performance construction and the lowest possible noise level. The gearbox is fitted with a fail-safe mechanical brake at the high-speed shaft.

Generator

The generator rotor construction and stator windings are specially designed for high efficiency at partial loads. The generator is fitted with a separate thermostat-controlled ventilation arrangement, and by ensuring a very efficient cooling, the generator can be operated at temperatures well below the normal level of the standard insulation class, thereby providing the best possible lifetime of the winding insulation.

Tower

The SWT-2.3-93 turbine is mounted on a tapered tubular steel tower. The tower has internal ascent and direct access to the yaw system and nacelle.

Controller

The turbine controller is a microprocessor-based industrial controller, similar to the type used in other Siemens wind turbines. The controller is complete with switchgear and protection devices. It is self-diagnosing and has a keyboard and display for easy readout of status and for adjustment of settings.

Operation

The wind turbine operates automatically, self-starting when the wind reaches an average speed of about 3–5 m/s. The output increases approximately linearly with the wind speed until the wind reaches 13–14 m/s. At that point, the power is regulated at rated power. If the average wind speed exceeds the maximum operational limit of 25 m/s, the turbine is shut down by feathering of the blades. When the wind drops back below the restart speed, the safety systems reset automatically.

Safety System

The turbine has several redundant levels in the safety system, including an independent pitch system for each of the blades, and as a result, the turbine can shut down safely from any operational condition.

Remote Control

The turbine is equipped with the unique WebWPS SCADA system. The system offers long-distance control and a variety of status views and useful reports from a standard internet web browser.

Grid Compliance

The SWT-2.3-93 turbine is fitted with our proprietary NetConverter? system that is compliant with even very demanding grid codes. The NetConverter? system has ride-through capability for all normal faults.

--> Technical Specification
--> Design