Generator Lubrication system

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Lubrication system:- The bearing lubrication is done by circulating oil under pressure and the complete system forms part of the main tube of the system of the turbine. Slip rings:- Slip rings are provided for turbo generators with conventional DC rotating or static excitation system. These are of alloy steel forging shrunk fitted on the
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Generator Rotor wedges,Retaining rings & Ventilation and cooling

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Rotor wedges:- Rotor winding is held in position by single/double dovetail shaped wedges made of non-magnetic material for two pole generators. This enables the winding to withstand high centrifugal force in operation and act as a damper circuit for current induced in rotor during in advert ant asynchronous operation these wedges help to have a
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Generator Bearing & Rotor

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Bearing:- The Turbo generators are provided with pressure lubricated self-aligning elliptical type bearing to ensure higher mechanical stability and reduced vibration in operations the bearing are either and shield mounted or pedestal type suitable temperature measurement device are mounted in the bearing to monitor bearing metal temp in operation.   Bearing insulation:- To prevent damage
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Generator Stator Bar’s and Winding

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Stator Bar’s and Winding:- Stator bar design incorporates the use of thermosetting epoxy mica insulation conforming to class “F” The bars/coils during manufacture are provided with conductive coating wrapping tape for minimisation of corona discharge semiconductive varnish/tape is applied a uniform temp distribution in operation double-layer lap winding with half Rebel / multitier  type/diamond shaped
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Turbo Generators-Their sizes

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Turbo Generators-Their sizes: In the table, I, II, III the various standard sizes of the Air/Hyderabad cooled Turbo generator (3000r.p.m) (Air cooled manufactured at BHEL Hyderabad are indicated at additional BHEL can undertake to manufacture tailor-made Turbo generator to suit specific customer requirement. Stator:- Stator frame is of welded steel single piece construction with radial
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ELECTRICAL MACHINES

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ELECTRICAL MACHINES Introduction : BHEL has 13 manufacturing plants and a host of service divisions a vital link to this chain of BHEL manufacturing units is the unit at Ramachandrapuram   Hyderabad, manufactures turbo generator of rating up to 120mw for industrial application and for power generation to thermal power stations. These Turbo generators are supplied
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Stresses in compressor wheel

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Stresses in compressor wheel: The forces exerted on the Gas turbine Rotor parts and resulting on that of compressor wheel are 1)        Air Force Airforce caused by the pressure difference between and down steam of the blades they can be steady or vibratory and can be minimized by sound aerodynamic design. 2)        Forces due to
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Specification & Rotor Wheel

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Specification & Rotor Wheel: The compressor wheel is a part of a compressor rotor in gas turbine rotor each compressor wheel is machine separately and assembled with tie rods the compressor rotor is an axial flow type with 17 stages. Material Composition : The wheel is made of haste alloy (Ni, Cr, motored sheet) it
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MAJOR PARTS OF GAS TURBINE

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MAJOR PARTS OF GAS TURBINE : Gas Turbine Parts : The main parts for the gas turbine are Base frame                Casings Diesel Engine            Turbine rotor Bearing housing       Bearings Works in drawer       Nozzles Stator Blades             Coolers Combustion system Molybdenum            –           1.4 Phosphorus   –           0.4 Gas Turbine rotor: The importance of Gas turbine this being known
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APPLICATION OF A GAS TURBINE

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APPLICATION OF A GAS TURBINE POWER GENERATION : Highly capacity gas turbines are widely used in power generation and standby. The grid system: Power is produced and distributed continuously to large distances through a grid system. Standby generation: Power is produced for emergency uses in hospitals, Public buildings only for a local purpose. MECHANICAL DRIVER
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FEATURE OF GAS TURBINE

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UNIQUE FEATURE OF GAS TURBINE :   Keeping a view of disadvantages gas in both hydro and thermal power stations – gas turbine as well designed and introduced for power generation. To make use of natural gas as a fuel. To eliminate pollution from the oral power section To reduce the usage of water unlike
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GAS TURBINE:

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ABOUT GAS TURBINE:   The  Power generating turbo – machine decrease the head or energy laver of the working fluid (Like steam gas, hydro and wind) passing through them these machines are called turbines. They are coupled as primers to generators for generation of power and running of pumps compressors etc., A stage of turbomachine generally
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STEAM TURBINE AUXILIARY OIL

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AUXILIARY OIL : Power oil at approximately 500kpa is supplied from pump through over speed  relay B up to speed drop setting value F. to mains stop valve oil cylinder C and up to control valve K the oil down steam of  F is pilot oil (100 – 400 kph) up to governor relay G
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STEAM TURBINE GOVERNING

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STEAM TURBINE GOVERNING :   Nozzle Governing : With nozzle governing a series of nozzle valves open is the sequence as the load increases this type of governing is most efficient and is used for impulse turbine. Throttle Governing : With throttle governing a single large control valve controls the load from 0% to 100%
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Steam Turbine Stationary Blades and Nozzles

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Stationary Blades and Nozzles : The first set of nozzle fan an impulse  turbine is the control  set and is divided into three to six sections with each section having a steam control valve for smaller turbines all sections may be located in the large turbines cover the entire circumference all stages following the control
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