2. A presentation on : HYDRO POWER
PLANT
Name : Amitabh Shukla
Enrolment no. : 120810111010
Branch : EC (4th Sem.)
Subject : Energy Systems
3. How dose a hydro power plant
works?
A hydro power plant works on
Hydrologic cycle.
4. How dose a hydro power plant
works? (cont..)
A dam is constructed
across a river, so water gets
collected in the dam and
a reservoir is created.
Extra water flows from the
gates provided on top of
the dam.
Now the water collected in
reservoir is used to
generate electricity.
Water from the reservoir
flows through penstocks to
hydraulic turbine
5. How dose a hydro power plant
works? (cont..)
During this process its potential energy is converted into kinectic
energy.
This high velocity jets of water strikes the hydraulic turbine and
kinetic energy is converted into mechanical energy.
Turbine is connected to a alternator (A.C. generator).
This alternator converts mechanical energy into electrical energy of
electricity.
Power generated is transmitted over power lines to many parts of
country.
7. Types of hydro power plant
Types of plant means types of dams.
Some of the types are listed below
Arch
Gravity
Buttress
Embankment or Earth
8. Arch dams
Arch shape gives strength
Less material (cheaper)
Narrow sites
Need strong abutments
12. Sizes of power plant
Definitions may vary.
Large plants : capacity >30 MW
Small Plants : capacity b/w 100 kW to 30 MW
Micro Plants : capacity up to 100 kW
17. Impulse turbine
Uses the velocity of the water to move the runner and discharges to atmospheric
pressure.
The water stream hits each bucket on the runner.
No suction downside, water flows out through turbine housing after hitting.
High head, low flow applications.
Types : Pelton wheel, Cross Flow
18. Palton wheels
Nozzles direct forceful streams of
water against a series of spoon-
shaped buckets mounted around the
edge of a wheel.
Each bucket reverses the flow of
water and this impulse spins the
turbine.
19. Palton wheel (cont..)
Suited for high head, low flow
sites.
The largest units can be up to
200 MW.
Can operate with heads as
small as 15 meters and as high
as 1,800 meters.
20. Reaction turbines
Combined action of pressure and moving water.
Runner placed directly in the water stream flowing over the blades rather than
striking each individually.
lower head and higher flows than compared with the impulse turbines.
21. Kaplan turbine
The inlet is a scroll-shaped tube
that wraps around the turbine's
wicket gate.
Water is directed tangentially,
through the wicket gate, and
spirals on to a propeller shaped
runner, causing it to spin.
The outlet is a specially shaped
draft tube that helps decelerate
the water and recover kinetic
energy.
22. Francis turbine
The inlet is spiral shaped.
Guide vanes direct the water
tangentially to the runner.
This radial flow acts on the
runner vanes, causing the runner
to spin.
The guide vanes (or wicket
gate) may be adjustable to allow
efficient turbine operation for a
range of water flow conditions.
23. Francis turbine (cont..)
Best suited for sites with high
flows and low to medium head.
Efficiency of 90%.
expensive to design,
manufacture and install, but
operate for decades
27. Advantages
Though its capital cost is comparatively high but its operation cost is
much less. Due to this the cost of power generation per unit is low.
These plants are more reliable.
Starting and stopping of these plants takes short time compared to
steam and nuclear power plants.
These power plants don’t have ash disposal and nuclear waste
disposal problems.
The life expectancy is higher. Its about 50 years.
These plants have high efficiency over wide range of loads s
compared to other plants.
28. Advantages (cont..)
These plants requires less supervising staff.
These plants can be used for irrigation, transportation, fisheries and
tourism and flood control purposes in addition to power generation.
29. Disadvantages
The total power developed depends on total amount of water
supplied, thus it depends on rainfall.
These plants are generally located far away from load centres,
hence, it requires long transmission lines. It increases the cost of
transmission lines and increases losses.
Time required developing these plants is high.
30. Other problems
Many fishes require flowing water for reproduction and cannot adapt to stagnant
resulting in the reduction in its population.
Heating of the reservoirs may lead to decrease in the dissolved oxygen levels.
The point of confluence of fresh water with salt water is a breeding ground for
several aquatic life forms. The reduction in run-off to the sea results in reduction
in their life forms.
Other water-borne diseases like malaria, river-blindness become prevalent.
31. Methods to alleviate the negative
impacts
Creation of ecological reserves.
Limiting dam construction to allow substantial free flowing water.
Building sluice gates and passes that help prevent fishes getting trapped.
32. Sardar sarovar dam
Project planning started as early as
1946.
Project still under construction with a
part of the dam in operation.
A concrete gravity dam, 1210 meters
(3970 feet) in length and with a
maximum height of 163 meters
33. Sardar sarovar dam
The gross storage capacity of the reservoir is 0.95 M. ha.m. (7.7 MAF) while live
storage capacity is 0.58 M.ha.m. (4.75 MAF).
The total project cost was estimated at Rs. 49 billion at 1987 price levels.
There are two power houses project- 1200 MW River Bed Power House and 250
MW Canal Head Power House. Power benefits are shared among Madhya
Pradesh, Maharashtra and Gujarat in the ratio of 57:27:16 respectively.
34. Environmental protection measures
About 14000 ha of land has been afforested to compensate for the submergence of
4523 ha of land.
Formation of co-operatives, extensive training to the fisherman, providing
infrastructure such as fish landing sites, cold storage and transportation etc.
Surveillance & Control of Water related diseases and communicable diseases.
Extension of Shoolpaneshwar sanctuary to cover an area of 607 sq.km.
