PPT on manufacturing of Turbo generator

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PPT on Turbo generators

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All About 

TURBO GENERATOR

A turbo generator is a turbine directly connected to an electric generator for the generation of electric power. It was invented by a Hungarian engineer Ottó Bláthy.

Large Steam powered turbo generators (steam turbine generators) provide the majority of the world's electricity and are also used by steam powered turbo-electric ships. Smaller turbo-generators with gas turbines are often used as auxiliary power units. For base loads diesel generators are usually preferred, since they offer much better fuel-efficiency and are also more reliable, but on the other hand they are much heavier and need more space. Important parts and their explanation are given in figure 5.2.

The efficiency of larger gas turbine plants can be enhanced, if the hot exhaust gases are used to generate steam which drives another turbo generator.

The turbo-generator can also be defined as a common-shaft excitation AC synchronous generator with 3 phases, 2 poles or with 3 phases, 4 poles [2].

Depending upon rating and design, a hydro-generator stator core and windings may be cooled by air, oil, hydrogen or water. For direct-cooled generators, the coolant is in direct contact with the heat producing members such as the stator winding. For any generator, a failure of the cooling system can result in rapid deterioration of the stator core lamination insulation and/or stator winding conductors and insulation.

5.5 TURBO GENERATORS MANUFACTURED

5.5.1 Air Cooled Generators Upto 200 MW Range (Type: TARI) Salient Design

        Features

Air Cooled

• Stator core and rotor winding direct air-cooled.
  
• Indirect cooling of stator winding.
• Horizontally split casing design of stator.
• Vertically side mounted coolers in a separate housing.
• Micalastic bar type insulation system.
• Separately assembled stator core and winding for reducing the manufacturing cycle.
• Brushless/static excitation system.

5.5.2 Hydrogen Cooled Turbo generators of 140-260 MW Range (Type: THRI)

         Salient Design Features

Hydrogen cooled

• Stator core and rotor winding directly hydrogen cooled.
• Indirect cooling of stator winding.
• Rigid core bar mounting.
• Micalastic insulation system.
• End shield mounted bearings.
• Top ripple springs in stator slots.
• Ring type shaft seals.
• Symmetrical ventilation.

For 500 MW turbo generators, some important data are given below.

Salient Technical Data: -

• Rated output : 588 MVA, 500 MW
• Terminal voltage : 21 KV
• Rated stator current : 16 KA
• Rated frequency : 50 Hz
• Rated power factor : 0.85 Lag
• Efficiency : 98.55%

Important Weights:

• Heaviest lift of generator stator : 255 Tons
• Rotor weight : 68 Tons
• Total weight of turbo generator : 428 Tons