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ACKNOWLEDGEMENT
My sincere thanks goes to Sh. S.K.GUPTA for his prodigious guidance, precaution,
painstaking, attitude reformative and suggestion throughout my summer training
schedule.
Special thanks goes to Mrs niraj kawar who helped me a lot in giving minute
details of the Manufacturing Process Of 500 MW TG Stator Winding Bars andenlightened me with the knowledge of essential equipments and their working.
Last but not the least, my sincere thanks to all the staff members of BLOCK-4,BHEL, RANIPUR, HARIDWAR
ArunpandeyB. Tech- 4th Years.m.c.e.tphagi,jaipur(Raj.)
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PREFACE
In the light of practical aspects of training for engineering. I am a student of B.Tech. 3rd
year had been completed my practical training at BHARAT HEAVY ELECTRICALSLIMITED (BHEL) HARIDWAR for 30 days.
The objects of training in engineering course is to correlate the theory withpractical aspects and to make students familiar with the difficulties arises during practical
application so that they can face challenges boldly while working in the field.
As I am a student of electrical engineering so training at BHEL had beenparticularly beneficial for me. I observe various electrical machineries that are used in
different large scale or a small scale industries and different types of power plants.
BHEL is very large industry for making the different types of equipments as
well as mechanical equipment.
I tried my best to get acquitted with over all plants. I hope that I have
excited enough in the report of my training.
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CONTENTS:-
CHAPTER I -> COMPANY PROFILE.
CHAPTER II -> BHEL - AN OVERVIEW
CHAPTER III -> ABOUT BHEL, HARIDWAR.
CHAPTER IV -> BLOCKS IN BHEL, HARIDWAR.
CHAPTER V -> BLOCK DIAGRAM OF BLOCK-4.
CHAPTER VI -> BRIEF SUMMARY OF CIM SHOP
(BLOCK-4)
CHAPTER VII -> MFG. PROCESS FLOW CHART OF
500 MW TG STATOR BAR.
CHAPTER VIII-> MANUFACTURING PROCESS OF
500 MW TG STATOR WINDING
BARS.
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CHAPTER - I
COMPANY PROFILE
The first plant of what is today known as BHEL was established nearly 40 years ago at
BHOPAL and was genius of heavy electrical equipment industry in India. BHEL is today
the largest engineering enterprise of its kind in India with well recognized track records ofperformance making profits continuously since 1971-72 it achieved a sales turnover of
1023 crore in 1977-78. BHEL caters to core sectors of the Indian economy in power,
industry, transportation,defense etc.
The wide network of BHELs 14 manufacturing divisions, 9 service centers & 4
power global players.
Power sector comprises thermal, nuclear, gas & hydro power plant business today,
BHEL supplied sets account for nearly 56, 318 MW or 65% of the total installed capacity
of 86, 636 MW in as against nit till 1969-70.
BHEL has proven turnkey capabilities for executing power projectors from concept
to commissioning. It possess the technology and capability to produce thermal power plantequipments up to 1000 MW rating and gas turbine generator sets up to a unit rating of 240
MW. Cogeneration and combines cycle plants has been introduced to acheve higher plant
efficencies. To make efficient use of the higher ash content coil manufacturers 235 MWnuclear turbine generator sets and has commenced production of 500 MW nuclear turbine
generator head discharge combinations are also engineered and manufactured is also
competitive.
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TRANSMISSION:-
BHEL also supplies a wide range of transmission products and system up to 400 KV class.
These include high voltage power and distribution transformer, instrument transformers,
instrument, transformers, dry type transformers. SF6 switch gear, capacitor and insulatoretc series and shunt compensation system have been also developed and introduced to
minimize transmission losses.
TRANSPORTATION:-
A high percentage of trains operated by Indian Railway are equipped with BHELs traction
and traction control equipments including the metro at Calcutta and delhi. The companysupplies broad gauge.
Electrical locomotive to Indian railway and diesel shunting locomotives to various
industries 5000/6000 hp ac/dc locomotive developed and manufactured by BHEL havebeen leased to Indian railway, battery powered road.
International operations:-
BHELs product series and projects have been exported to over so countries ranging fromUNITED STATES in the west to NEW ZEALAND in for east INDIA is over 3000 MW.
A few motable ones are 150 MW gas turbine to GERMANY, utility boiler and open cycle
gas turbine plant to MALAYSIA, Tripoli west, power station in Libya and Turkey. InCyprus, hydro generator to New Zealand and hydro power plant to Thailand , Saudi
Arabia, Oman , Greece and Egypt.
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CHAPTER III
ABOUT BHEL HARIDWAR
At the foothills of the majestic Himalayas on the bank of the holy ganges in Ranipur nearHARIDWAR is located Heavy Electrical Equipment Plant (HEEP) of BHEL.
BHEL , wholly owned by the govt. of INDIA is and integrated engg. Complex
consisting of several plants in INDIA, where about 70000 workers are busy in design andmanufacturing of heavy electrical equipment.
At present 70% of the country electrical equipment is generated BHEL
HARIDWAR.
PRODUCTs OF BHEL
Heaps product & capacity ratings
PRODUCT CAPACITY RATING
1. Thermal/nuclear set 210 MW 1000 MW2. Hydro set 115 MW
3. Generator Acc. To Requirement4. Gas turbine 60 MW 200 MW5. Heat exchangers, condenser Up to 800 MW
6. AC/DC electrical machine 5 KW 2000 KW
(a) - AC ( 250 KW 1600 KW)(b) - DC 7KW 1000 KW)
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CHAPTER IV
BLOCKS IN BHEL
Block-1 -> Hydro & turbo generators, AC/DC machines
Block-2 -> Fabrication ( steam , hydro & gas turbine)
Block-3 -> Gas, hydro & steam turbine
Block-4 -> CIM and ACM
Block-5 -> Heat exchangers, forging & fabrication
Block-6 -> Electrical repair & maintenance of motor & transformer
Block-7 -> Wooden packing works
Block-8 -> Fabrication, seamless tuber and heat exchanges
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CHAPTER II
BHEL- AN OVERVIEW
BHEL is the largest engineering and manufacturing enterprise in India in the energy related
/ infrastructure sector. BHEL was established more than 40 years ago, ushering in the
indigenous Heavy Electrical Equipment industry in India, a dream which has been more
than released with a well-recognized track record of performance. It has been earning
profits continuously since 1971-72 and achieved a sales turnover of Rs. 18,739 crore with a
profit before tax of Rs. 3,736 crore in 2006-07.
BHEL caters to core sectors of the India economy viz. Power Generation andTransmission, Renewable Energy, Defence etc. The wide network of BHELs 14
manufacturing divisions, 4 power sector regional centers, 8 service centers, 15 regional
offices and a large number of Projects sites spread all over India and abroad enables the
company to promptly serve its customer and provide them with suaitable products, systems
and services- efficiently and at competitive prices.
BHEL has attained ISO 9001 certification for quality management and all the
manufacturing units/divisions of BHEL have been upgraded to the latest ISO 9001:2000
version. All the major units/divisions of BHEL have been awarded ISO 14001 certification
for Environmental Management System and OHSAS-18001 certification for Occupational
Health and Safety management System. BHEL become the first Public Sector Company in
the country to win the coveted PRIZE for its Haridwar unit under the CII Exim Award
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for business excellence as per the globally recognized model of European Foundation for
Quality Management. BHEL is the only PSU among the 12 Indian Companies to figure in
Forbes Asia Fabulous 50 list. It has also won the Business Standard Star Public Sector
Company Award 2006. The company received MoU Excellence Award for 2004-2005
and Merit Certificate for MoU Excellence for 2005-2006.
Power Generation
Power generation Sector comprises Thermal, Gas, Hydrogen Nuclear power plant business.
As of 31.3.2007. BHEL supplied sets accounts for 80,781 MW or nearly 65% of the total
install capacity of 1,25,414 MW in the country. Significantly these sets contribute 73% of
the total power generated in the county.
BHEL has proven turnkey capabilities for executing power projects from Concept to
Commissioning. It possesses the technology and capability to produce Thermal sets with
super critical parameters upto 1000MW unit rating and gas turbine generator sets of upto
300MW units rating. Co-generating and Combined cycle plants have been introduce to
achieve higher plant efficiencies. To make efficient use of the high-ash-content coal
available in India. BHEL also supplies circulating Fluidized Bed Combustion (CFBC)
boilers for Thermal plants.
The company has proven expertise in Plant Performance Improvement through
Renovation, Modernization and Uprating of a variety of Power plant equipment, besides
specialized know-how of residual life assessment health diagnostics and life extension of
plants. Overall, BHEL built Thermal sets achieved the highest ever PLF of 78.3% in 2006-
2007 which is 1.5% higher than the National average. The combined operating availability
of these sets was 84.7%.
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---
CHAPTER - VI
BRIEF SUMMARY OF CIM SHOP (BLOCK IV)
BAY-1: Bar winding shop: Manufacturing of stator winding bars of generator
BAY-II: 1-Manufacturing of motor stator coil: DC armature coil, main pole coil, inter-
pole coil, equalizer coil etc.
2- Also manufactured heavy duty generator stator bars with New CNC M/c No, 3-464 i.e.
Robol bar centre.
BAY-III: Insulation detail shop; Manufacturing of hard insulation & machining of hares
insulation part (Glass textolite) such as packing, washer, insulation box. wedges etc.
Bar Shop: This shop is meant for manufacturing of stator winding coils of generator that
may be turbo-generator or hydro-generator.
Why do we call it bar:It is quite difficult (rather impossible) to manufacture, handle
and wind the coil in stator slot of generator of higher generation capacity because of its
bigger size and heavy weight. That is why we make coil in two parts. One part isBottompart of coil called bottom or tower bar and other part of coil is called top bar or upper bar.
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HG Bars: The manufacturing of bars of different capacity as required by the customer
depends upon the water head available at site. The Hydro generator is air cooie^ generator
of te
comparison to its tagger diameter.
(Note:- The manufacturing of Hydro Gen Stator Bars has been shifted from BHEL
Haridwar to BHEL Bhopal to since 2008.)
TURBO-GENERATORS: The manufacturing of bars of standared capacity such as:
100MW, 130MW, 150Mw, 210/235MW.
The plant has capacity and technology to manufacture 800MW and 1000MW generators.
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CHAPTER - VII
MFG. PROCESS FLOW CHART OF 500MW TG
STATOR BAR
1. Conductor Draw From Store.
2. Conductor cutting and end cleaning.
3. Transposition of conductor.
4. Assembly of all conductors to be used in stator Bars.
5. Cross over insulation.
6. Consolidation if slot portion of Bar.
7. IS Test(i.e. inter strand test).
8. Forming or Bar (to shape overhang portion).
9. Pickling of bar ends (1)
10 Mounting of Contact sleeve & bottom part of water box.
11. Brazing of Contact sleeve & bottom part of water box.
12. Pickling of bar ends (2)
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13. Mounting of water box leak test.
14. Repickling.
15. Water flow and N2 test.
16. Thermal Shock Application.
17. Helium Leak Test.
18. Reforming of Bar.(i.e. overhang portion).
19. Insulation of bar on CNC macnine.
20. Impregnation an curing of bar insulation.
21. Surface finishing of stator bar.
22. OCP on stator Bar.
23. Preparation of bar for HV and TanQ Test.
24. If O.K. Dispatch to Bicck-1 for laying in the generator.
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INSULATION CLASSIFICATION:
Thermal classification of insulation depends upon the temperature
Withstand capability of the insulation.
Class Y upto 90 C
Class A upto 105 C
Class E upto 120 C
Class B upto 130 C
Class F upto 150 C
Class H upto 180 C
Class C >180 C upto 220 C.
TYPES OF GENERATORS:
The generator may be classified based upon the cooling system used in the generators such
as-THRI, TARI,THDI, THDD, THDF, THFF, THW.
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T-> First alphabet signifies the type of generator i.e. turbo-
generator or Hydro-generator.
H/A-> Second alphabet stands for the coding media used for
the cooling of rotor i.e. hydrogen gas or air.
R/D/F/I-> Third alphabet signifies the type of cooling or rotor
eg. Radial,indirect, forced, direct etc.
I/D/F-> Last alphabet stands for the type of cooling of stator
e.g. indirect cooling, direct cooling, forced cooling.
W-> Cooling media used for cooling of stator coil e.g. water.
Resin system:
a) Rich Resin or Thermoreactive insulation system:In this type of insulation
system the bond content in resin 36-37%. The raw materials are ready to use and require
preservation and working on temperature 20-25':
C. Its sheif life is one year when Kept at
temperature 20 C which could be increased when kept at temperature of 5 C.
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b) Poor resin or Micalastic insulation system: In this type of insulation the
bond content in the resin is 5-7% and insulating material isprepared with accelerator
treatment. The temperature control need not required. The insulating material is applied on
job and then the same is impregnated (fully dipped) in the resin.
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CHAPTER - VIII
MANUFACTURING PROCESS OF BARS:
Some Points of Manufacturing Process are in brief as below:---
1.Conductor Cutting :
This process is done by automatic CNC machine. In this process the pre-insulated copper
conductor is cut into number of required length. Insulation is removed from both ends of
the conductor cut.
Lower Bar :
Conductor size 8*4.6*1.5 mm (Hollow)
8*2.8 mm (Solid)
L - 10200 mm c- 500 mm
Conductor No.In 1 Bar Hollow - 20
Solid - 20
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Upper Bar :
U 10050 mm c- 5 mm
Conductor size 8*4.6*1.5 mm (Hollow)
8*1.3 mm (Solid)
Conductor No. in 1 Bar Hollow - 20
Solid 40
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CONDUCTOR CUTTING
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2. Transposition:Transposition means changing/shifting of position of each conductor in active core (slot)
part. After cutting the required number of conductors, the conductors are arranged on the
comb in staggered manner and then bends are given to the conductors with the help of
bending die at required distance. Then the conductors are taken out from the comb and die
and placed with their ends in a line and transposition is carried out. This process is repeated
for making another half of the bar which would be mirror image of the first half. The two
halves of the bar are overlapped over each other and a spacer is placed between the two
-halves.
1. To reduce eddy current losses.
2. Equalize the voltage generator
3. To minimize skin effect of ac current so small cross section of conductor is used and also hollconductor are used to effect colling by D.M. water
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TRANSPOSITION
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3. Crossover Insulation :
The pre insulation of the copper conductor may get damaged due to mechanical bending in
die during transposition, hence the insulating spacers are provided at the crossover portion
of the conductors. A filler material (insulating putty or moulding micanite)is provided
along the height of the bar to maintain the rectangular shape and to cover the difference of
level of conductors.
To eliminate inter turn short at bends during edges wise bending and leveling of bars in
slots portion for proper stack pressing.
4. Stack Consolidation :The core part of the bar stack is pressed in press (closed box) under pressure (varies from
product to product) and temperature of 160 C for a given period. The consolidated stack is
withdrawn from the press and the dimensions are checked.
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PRESSED BARS
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5. Inter Strand Short Test :
The consolidated bar stack is tested for the short between any two conductors in the bar, if
found then it has to be rectified.
This is done to ensure that no local current is flowing due to short circuit between conductors.(300 A/
supply)
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BARS
READY FOR FORMING
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6. Forming :
The straight bar stack is formed as per overhang profile (as per design), The overhang
portion is consolidated after forming.
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FORMING
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7. Brazing of coil lugs :
For water cooled generator bars, the etectrical connection contact and water box for inlet
and outlet of water are brazed.
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LUG MOUNTING
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DEPARTMENT OFELECTRICAL ENGINEERING
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BOTTOM PART WATERBOX
BRAZING
TOP WATER BOXBRAZING
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8. Nitrogen Leak Test :
The bar is tested for water flow test, nitrogen leak test and pressure test for given duration.
9. Thermal shock test:
The cycles of hot (80C) and cold (30C) water are flew through the bar to ensure the
thermal expansion and contraction of the joints.
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THERMAL SHOCK TESTING
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10. Helium leakage test:After thermal shock test bar is tested for any leakage with the help of helium gas.
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HELIUM LEAK TESTING
Helium Testing ByHelium Sensing Probe
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DEPARTMENT OFELECTRICAL ENGINEERING
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Leakage Between Brazing OfNipples
Leakage Between Brazing OfNipples
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Leakage Between BrazedWater Cups
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11. Insulation:The bar is insulated with the given number of layers to build the wall thickness of
insulation subjected to the generating voltage of the machine.
12. Impregnation and baking:
a) Thermoreactive system: In case of rich resin insulation the bar is pressed in
closed box in heated condition and baked under pressure and temperature as per
requirement for a given period.
b) Micalastic system: In case of poor resin system the insulated bars are heated under
vaccum and the impregnated (dipped) in heated resin so that all the air gaps are filled, layer
by layer, with resin. Then extra resin is drained out and bars are heated and baked under
pressed condition in closed box fixture.
VPI Micalastic system: The bars already laid in closed fixture and full fixture is
impregnated (dipped) in resin and then fixture with box is baked under given temperature
for given duration.
VIP Micalstic system: The individual (separate) bar is heated in vaccum and
impregnated in resin. Then bar is taken out and pressed in closed box fixture and then
baked at given temperature for given duration.
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13. Finishing:
The baked and dimensionally correct bars are sanded-off to smoothen the edges and the
surface is calibrated, if required, for the dimension.
14. Conducting varnish coating:
i) OCP (Outer Corona Protection) coating:The black semi-conducting varnish
coating is applied on the bar surface on the core length.
ii) ECP (End Corona Protection) coating:The grey semi-conducting varnish is
applied at the bend outside core end of bars in gradient to prevent from discharge and
minimize the end corona.
15. Testing:
a) Tan@ test:This test is carried out to ensure the healthiness of dielectric (Insulation)
i.e. dense or rare and measured the capacitance loss.
b) H.V. Test: Each bar is tested momentary at high voltage increased gradually to
three times higher than rated voltage.
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16. Dispatched for Winding :
The bars preserved with polythene sleeves to protect from dust, dirt, oil, rain etc are send to
Block-I (Electric Machines Production Block I, Turbo Generators and Hydro Generators)
for winding.
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CONCLUSION
Engineering students will have to serve in the public and private sector industries,laboratories and workshops based training & teaching in classroom has its own limitations.
The lack of exposure to real life, materials processes and functioning of industrial
organization is the measure hindrances in the student employment.
In the open economy era of fast modernization and tough competition, technical institutesshould procedure pass outs as near to job function as possible.
Practical training is one major step in this direction. This training helped me in gaining indepth knowledge of the working of a telephone exchange.
At last I would only say that this training was helpful for my future prospects.
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