1. AN INDUSTRIAL INTERNSHIP PRESENTATION
RAJASTHAN RAJYA VIDHYUT UTPADAN NIGAM
LIMITED
MAHI HYDEL POWER HOUSE-1, BANSWARA
Presented By:-
Jayant Joshi
12ME001649
Department of Mechanical Engineering
SIR PADAMPAT SINGHANIA UNIVERSITY, UDAIPUR
2. INTRODUCTION
MAHI HYDEL POWER STATIONS
Project Name: Mahi Bajaj Sagar
Project By: Govt. of Rajasthan And Gujrat states
Dedicated By: Prime Minister Indira Gandhi in January, 1983
Dedicated to Nation: February 1986
Dam Catchment Area: 6149 sq. km
Active Capacity of Dam: 2,070 MCM at FRL of 280.75 m and the MDDL of the project is at 259 m.
Power Capacity: 140MW(2*25 & 2*45)
4. Specifications:-
Capacity of machines 2 x 25 MW
Type of turbine FRANCIS TYPE
[VERTICALSHAFT]
Date of commissioning of Unit I 22-1-1986
Date of commissioning of Unit II 06-2-1986
Date of dedication of Nation 13-2-1986
Types of generator UMBRELLA Type.
Capacity of generator 27.778 MVA. At 11 kV,50 Hz
Rated Speed 150 rpm.
Turbine output at rated head of 40m 25.825 MW.
Capacity of power transformer 11/132 kV,31.5 MVA, 3-Ø.
Diameter of Penstock pipe 4.2m
Length of Penstock pipe 90m
Length of Tail Race tunnel 1462m
Tail Race level max. (from sea level) 238 m
Tail Race level min. (from sea level) 231 m
Capacity of Reservoir (at 281.5 m) 80 TMC
5. TURBINE:-
1. Type of Turbine Francis Vertical Shaft
2. Net Head Max.- 50.0 m
Rated- 40.0 m
Min.- 26.0 m
3. Outputs Max. Output of Turbine
at Designing- 28.40 MW
Rated Output of turbine
at design Head- 25.825
MW
4. Speed of Rotation Synchronous- 150 rpm
Direction- clockwise
when viewed from
generator end
5. Discharge At rated head and max.
output- 80.55 m3/sec
At rated head and rated
output- 71.1m3/sec
6. Methodology:-
Penstock: It is a large size conduit which conveys water from the upstream to the dam/reservoir to the
turbine runner.
Spiral Casing: It constitutes a closed passage whose cross-sectional area gradually decreases along the
flow direction; area is maximum at inlet and nearly zero at exit.
Guide Vanes: These vanes direct the water on to the runner at an angle appropriate to the design, the
motion of them is given by means of hand wheel or by a governor.
Governing Mechanism: It changes the position of the guide blades/vanes to affect a variation in water
flow rate, when the load conditions on the turbine change.
Runner and Runner Blades: The driving force on the runner is both due to impulse and reaction effect.
The number of runner blades usually varies between16 to 24.
Draft Tube: It is gradually expanding tube which discharges water, passing through the runner to the tail
race.
8. BEARING:-
Thrust bearing type –
Spring matters supported: (No. of pads – 8)
Guide bearing type –
Pivoted type: (No. of pads – 18)
Normal operating temperature of bearing pads: 60°c
Guide Bearing Thrust Bearing
9. Methodology:
Shaft and Guide Bearing Bracket-
1. Top Bracket 2. Brakes and Jacks
Shaft And Thrust Bearing Block
H.S. Lubrication for Thrust Bearing
Shaft Sealing
10. GOVERNOR AND CONTROL EQUIPMENTS:-
Specifications:
1. Type Electro hydraulic Governor
G-40
2. Speed setting range 50+_5Hz
3. Gate setting range 0-100%
4. Permanent speed drop bp 0-10%
5. Temporary speed drop(off line)bt
Governor sensitivity
0-100%
10-1000mA/Hz
G
O
V
E
R
N
O
R
11. Function of Governor:
1. Load Variation 2. Load Rejection
Parts of Governor:
1. Hydro-mechanical Cabinet
2. Gate Limiter
3. Electro-hydraulic Transducer
Electro-hydraulic
Transducer
22. MAINTENANCE OF HYDRO POWER PLANT:-
1. Water Seal and Oil Seal
2. Turbine Guide Bearing
3. Top Cover Drain System
4. Centralized Grease Lubrication System
5. Hydro-mechanical Cabinet of Governor
23. CONCLUSION
In conducting the project study in an industry, students get exposed and have knowledge of
real situation in the work field and gains experience from there. The object of the summer
training project is to provide an opportunity to experience the practical aspect of Technology in
any organization. It provides a chance to get the feel of the organization and its function.
In Hydro power plants, the potential energy of water is utilized by the turbine to rotate coil
at high torque. The torque so produced is used in driving the coil coupled to generators and thus
in generating Electrical Energy.
I have privilege taking my practical training at " MAHI HYDRO POWER HOUSE - I "
where power generation takes place in bulk. The fact that Hydro energy is the major source of
power generation itself shows the importance of Hydro power generation in India.
This training proved an opportunity for encounter with such huge machines like hydro-
generator ,transformers etc. The architecture of Hydro power plant way various units are
linked and the way working of whole plant is controlled make the students realize that
Engineering is not just structural description but greater part is planning and management. It
provides an opportunity to learn tech. Used at proper place and time can save a lot of labour.
However, training has proved to be satisfactory. It has allowed us an opportunity to get an
exposure of the practical implementation of theoretical fundamentals.
