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Manufacturing of Turbo Generators

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BHEL-AN OVERVIEW

BHEL is one of the largest power plantequipment manufacturing firms in Indiaand it ranks among the top tenmanufacturers globally. BHEL hascovered up many power stations over40 countries worldwide .

It progressed rapidly and three morefactories went into production in 1965.The aim of establishment BHEL was tomeet the growing power requirement of

the country.

BHEL manufactured 97% of thepower generating equipment thatwas commissioned in India during

1979-80.

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TURBO GENERATOR

TURBO GENERATOR

A turbo generator is a mechanical

device that issued to produce

electrical power. It does so by

turning a large turbine that isconnected to a generator, which

converts mechanical energy to

electrical energy.

In a turbo generator turbine

is directly connected to an electricgenerator for the generation of

electric power.

In Turbo generators a furnace is

used and it heats water under high

pressure so that it turns into steam

Fig:-Hydrogen Cooled Turbo

Generator

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STATOR FRAME

ABOUT

The outer casing is of

gastight and pressure

resistant welded

construction.

The frame is made up

of a non magnetic

material to prevent the

eddy current losses.

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a orcore

The stator core is made ofinsulated steel laminations.The thickness of thelaminations and the type of

steel are chosen to minimizeeddy current and hysteresislosses

To remove the heat, a large

number of space segments,are made along whole lengthof the core to pass thecooling agent through it andkeep the stator core cool.

The stator core is then

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Fig:- Horizontal and vertical finishing machine forRotor.

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rotor

The rotor has 2 large spaced

sides, it creates two poles on the

rotor which works as north andsouth poles when rotor rotates.

These special shapes helps the

rotor to keep on rotating after

initial starting.

Windings are placed in these

spaces.

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ROTOR AFTER FINAL

ASSEMBLY

Coils are

placed in the

gaps which

allows the flowof current when

the rotor

rotates

The hydrogengas is

circulated

within the rotor

enclosure, and

cooled by a- -

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Here you can see the turbo generator under its final assembly. The testing of this

turbo generator is done at the same place. The central part consists of the cooling

system which keeps the rotor cool and for the cooling of the stator part tubes are

mounted on the stator bars, cooling agents are flown through these tubes which

protects the generator from overheating. Its rotor is connected to the motor tocheck the Turbo generator working properly.

Fig:- Final assembly of Turbo Generator

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At this end of the Turbo Generator exciter is connected, the exciter is

connected directly to it. As coolant mostly Hydrogen is used. But Air,

water, nitrogen etc. can also be used.

The tube on the upper part is for the flow of coolant to absorbsheat to kee the tem erature of the enerator below its limits.

Fig:- View from the Exciter end.

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Exciterenables the synchronous generator to

generate its own reactive energy. The exciter

also regulates its own power.

Fig:- Exciter .

internal

view of

exciter

There are

the fuses

and thecapacitors

mounted on

the exciter

part to

generate

startingtoque and

fuse to

prevent

from the

over

current.

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The following are routine tests on

GENERATOR.

1) Mechanical run test and vibration measurement.2) Short circuit characteristic and lossesmeasurement.3) Open circuit characteristic and loses measurement4) Phase sequence check.5) Shaft voltage measurement6) Impedance measurement at standstill, at 1/3,2/3and 3/3 of rated speeds.7) Insulation Resistance measurement on stator andRotor winding.

8) PI value measurement.9) High Voltage Test on stator and rotor winding.10) RTDs Checks.11) DC Resistance measurement on stator and rotorwinding.

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QUERIES

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