Why gear box is used in steam turbine?

Our high speed gearboxes are installed between steam turbine and electric generator. The function of the gearbox is to reduce the speed from extremely high turbine speed to the designated generator speed.

What is the purpose of a gearbox in a wind turbine?

Most wind turbine drivetrains currently use generators that are connected to gearboxes, which speed up the rotation from the relatively slow speed of the turbine’s blades (typically 5–15 rotations per minute for a modern machine), to the high speeds (1,000–1,800 rotations per minute) needed to generate electricity …

What is the relationship between a turbine a shaft and a generator?

In a turbine generator, a moving fluid—water, steam, combustion gases, or air—pushes a series of blades mounted on a rotor shaft. The force of the fluid on the blades spins/rotates the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy.

What is the function of gear box?

The gearbox is a mechanical device used to increase the output torque or to change the speed (RPM) of a motor. The shaft of the motor is connected to one end of the gearbox and through the internal configuration of gears of a gearbox, provides a given output torque and speed determined by the gear ratio.

What are the requirements of a gear box?

Basics of Gearbox Selection

• Service Factor. Before sizing an application, the customer should determine the service factor.
• Ambient Temperature and Environment.
• Shock Load or Type of Load.
• Output Style or Mechanism.
• Output Shaft or Hollow Bore Size.
• Housing Styles.

Where is the gearbox on a wind turbine?

In order to reach the correct rotational speed and generate power at the frequency needed by the grid you will need to use a gearbox between the main shaft (connected to the blades) and the secondary, “high speed” shaft linked to the rotor in the generator.

What’s the difference between a turbine and a generator?

Jet engines are turbines that run on kerosene and either produce rotating power to turn propellers or speed up hot gases to produce thrust for the jet airplane. Gas turbines burn natural gas to power ships, and steam turbines use the pressure from boilers to produce rotating power for industries.

Why gear box is used in automobile?

Most modern gearboxes are used to increase torque while reducing the speed of a prime mover output shaft (e.g. a motor crankshaft). In this case, most of the gear ratios (often simply called “gears”) are used to slow down the output speed of the engine and increase torque.

What are the consideration while designing gear box?

Overall gear ratio and number of different reductions and their gear ratios if multi-speed and the ratio tolerance. Size and envelope requirements. Weight restrictions. Input and output interfaces and dimensions.

What is the use of gear box in a generator?

Usage of gear box is to reduce the speed of the generator side shaft. The speed is usually 1500 pm and 3000 rpm for a 4 pole and 2 pole generator. Let’s suppose, the turbine speed is greater than the generator speed, a gear box is used for speed reduction. There are turbines, where both the shaft speeds are the same.

What is a gearbox in a wind turbine?

A gearbox is typically used in a wind turbine to increase rotational speed from a low-speed rotor to a higher speed electrical generator. A common ratio is about 90:1, with a rate 16.7 rpm input from the rotor to 1,500 rpm output for the generator. Some multimegawatt wind turbines have dispensed with a gearbox.

Can a steam turbine power a generator without a gearbox?

It is possible to use a steam turbine directly coupled to a generator without any gearbox for very low range, maybe up to 500 kWe. Electrical generators in India operating at 50 Hz usually have a speed of 1500 or 3000 RPM. In such cases turbines also operate at 3000 RPM so that it can be directly coupled to a generator.

What is a jacking gear in a turbine?

The major purposes of turning gear operation during turbine startup A jacking gear (also known as a turning gear) is a device placed on the main shaft of an engine or the rotor of a turbine. The jacking gear rotates the shaft or rotor and associated machinery (such as reduction gears and main turbines), to ensure uniform cool-down.