A PPT ON TRAINING DONE AT BHEL HARIDWAR
SUBMITTED TO :PROF. NARAYAN RAM PATEL
SUBMITTED BY:DEEPAK SINGH
11EJIEE0157th SEM
WHAT IS BHEL ?
• BHEL stands for Bharat Heavy Electricals Limited.
• It is one of the most important PSUs of our country.
• It manufactures a wide range of electrical equipment like generators, motors, exciters and other power plant accessories.
•BHEL business operations cater to core sectors of the Indian Economy like:PowerIndustryTransportationTransmissionDefence
MANUFACTURING DIVISIONS OF BHEL
Heavy Electrical Plant, Piplani, Bhopal Electrical Machines Repair Plant (EMRP),
Mumbai Transformer Plant P.O. BHEL, Jhansi Heavy Electrical Equipment Plant Ranipur,
Haridwar Central Foundry Forge Plant Ranipur, Haridwar Heavy Equipment Repair Plant, Varanasi Insulator Plant, Jagdishpur, Distt. Sultanpur
Heavy Power Equipment Plant, Ramachandra Puram,Hyderabad
High Pressure Boiler Plant & Seamless Steel Tube Plant,Tiruchirappalli
Boiler Auxiliaries Plant, Indira Gandhi Industrial Complex, Ranipet
Industrial Valves Plant, Goindwal Electronics Division, Bangalore Component Fabrication Plant, Rudrapur Piping Centre, Chennai Regional Operations Division, New Delhi
BHEL HARIDWAR
• It is divided in 2 units i.e. Heavy Electrical Equipment Plant (HEEP) and Central Foundry Forge Plant (CFFP).
• We did our training at HEEP plant.• HEEP plant is divided into 8 blocks.• Turbo generators are manufactured at HEEP
plant.• Each block manufactures different
components of a turbo generator.
BHEL HEEP PLANT, HARIDWAR
VARIOUS BLOCKS AT HEEP
1) Block 1In block 1 mainly stator, rotor shaft and exciter are manufactured and assembled for LSTG (Large Size Turbo Generators). 2) Block 2In block two large size fabricated assemblies/components for power equipment are manufactured & assembled.
3) Block 3In block -3 steam turbines, gas turbines and turbines blade are manufactured and assembled. 4) Block 4In block -4 winding for turbo generator, insulating components for turbo generator are manufactured & assembled. 5) Block 5In block -5 fabricated parts of steam turbine are manufactured & assembled.
6) Block 6In block -6 fabricated oil tanks, hollow guide blades, rings, stator frames, rotor spiders are manufactured & assembled. 7) Block 7In block -7 all types of dies including stamping dies, stamping for generators & motors are manufactured & assembled. 8) Block 8In block -8 LP heaters, ejectors, steam coolers, oil coolers, ACG coolers, oil tanks are manufactured & assembled.
TYPES OF TURBO GENERATORS
The generator may be classified based upon the cooling system used in the generators such as:THRI, TARI, THDI, THDD, THDF, THFF, THW T = Turbo Generator H/A/W = Hydrogen, Air, Water D/F/I = Radial, Indirect, Forced W = (Water) cooling media used for cooling of
stator coil
COMPLETE TURBO GENERATOR SET
• Stator • Rotor• Turbine• Exciter
STATOR OF TURBO GENERATOR
• The stator of a turbo generator consists mainly of stator core and stator winding.
• The stator winding is the armature winding.• When rotor rotates a 3 phase emf is induced
in the armature winding.• Basically hydrogen gas may be filled inside
stator for cooling purpose.
STATOR CORE• A stator core looks like:-
• The stator core has slots in it so that the stator winding can be housed in the stator.
• The stator core is made up of ferromagnetic material so as to allow maximum amount of flux through it.
• Since the flux passing through the stator is varying, the stator core is made up of thin laminations to avoid eddy current losses in the core.
STATOR WINDING
• The stator has 3 phase, double layer, short pitched and bar type of windings having two parallel paths.
• Each slot accommodates 2 bars.• Each bar consists of hollow as well as solid
conductors.• Hollow conductors are used to make water
flow through them for cooling purpose.
• The hollow and solid conductors are arranged in alternate arrangements.
• A picture showing stator winding bars :-
TURBO GENERATOR ROTOR
The rotor comprises of following components:-• Rotor shaft• Rotor winding• Rotor wedges • Fans• Field lead connections
ROTOR SHAFT
• Turbo generators are high speed generators since they are used in steam and gas power plants.
• Because of high speed the diameter of turbo generator rotor has to be less.
• Therefore, the turbo generator rotor is of cylindrical type.
• The rotor shaft is made of high quality steel so as to permit flow of magnetic flux through it.
• The rotor shaft is machined and slots are cut into the cylindrical structure for rotor winding.
• For better accuracy and flawless machining, Computerised Numeric Control (CNC) lathe machines were being used for cutting, boring, etc.
A ROTOR SHAFT
A CNC LATHE MACHINE
ROTOR WINDING
• Slots are cut into the cylindrical rotor along the axis for placing rotor winding.
• The rotor winding is excited by dc supply from an exciter.
• The rotor is cooled by the hydrogen gas filled in the stator.
• Field connections are taken out from the rotor to supply dc.
TURBINES
The various types of turbines are :-• High speed turbines• Low speed turbines• Intermediate speed turbinesA turbine is connected to the rotor shaft of the generator. When highly pressurized steam/gas falls on the turbine, it rotates. This makes the rotor to rotate and emf is induced in stator windings.
A LOW SPEED TURBINE
A HIGH SPEED TURBINE
EXCITER
• An exciter is a dc generator which is used to provide dc supply to the field winding of the rotor.
• The exciter is connected to the rotor shaft and rotates with the rotor.
• An ac generator may also be used as an exciter and in that case the output of the exciter is first rectified and then given to the field winding of the rotor.
AN EXCITER
CONCLUSION
• BHEL has now started manufacturing Large Size Turbo Generators (LSTG) of capacity as large as 800MW and this company has been earning profits since its inception. It has been a fruitful experience to undergo training program at BHEL Haridwar and it has truly made me aware to the work environment of the industry.