This document describes the components and working of a hydroelectric power plant. It explains that potential energy from water stored behind a dam is converted to kinetic energy as the water flows through turbines, which spin generators to produce electricity. The main components are the dam, spillways, penstock, turbine, generator, and tailrace. Water is stored in a reservoir and regulated through gates and spillways before passing through a penstock to spin the turbine and generate electricity.
In hydroelectric power station the kinetic energy developed due to gravity in a falling water from higher to lower head is utilized to rotate a turbine to produce electricity.
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To study working of each component of hydro power plant?
1. Experiment No.4
Objective:
To study working of each component of hydro power plant?
Theory:
Working:
Potential energy is the energy which a substance has due to its position or state.
The water behind a dam has potential energy because of its position. The water can fall from this
position and exert a force over a distance and therefore do work. In a Hydro-electric power plant
the force is used to drive a turbine, which inturn drives the electric generator. Because gravity
provides the force which makes the water fall, the energy stored in the water is called
gravitational potential energy.
Fig 4.1 (Hydropower Plant)
2. Layout Of Hydro Electric PowerPlant:
WaterReservoir:
In a reservoir the water collected from the catchment area is stored behind a dam. Catchment
area gets its water from rain and streams. The level of water surface in the reservoir is called
Head water level.
Note : Continuous availability of water is a basic necessity for a hydro-electric power plant.
Dam :
The purpose of the dam is to store the water and to regulate the out going flow of water. The dam
helps to store all the incoming water. It also helps to increase the head of the water. In order to
generate a required quantity of power it is necessary that a sufficient head is available.
Spillway:
Excess accumulation of water endangers the stability of dam construction. Also in order to avoid
the over flow of water out of the dam especially during rainy seasons spillways are provided.
This prevents the rise of water level in the dam.Spillways are passages which allows the excess
water to flow to a storage area away from the dam.
Gate:
A gate is used to regulate or control the flow of water from the dam.
Pressure Tunnel:
It is a passage that carries water from the reservoir to the surge tank.
Surge Tank:
A Surge tank is a small reservoir or tank in which the water level rises or falls due to sudden
changes in pressure.
Purpose of Surge Tank:
To serve as a supply tank to the turbine when the water in the pipe is accelerated during
increased load conditions and as a storage tank when the water is decelerating during reduced
load conditions.To reduce the distance between the free water surface in the dam and the turbine,
thereby reducing the water-hammer effect on penstock and also protect the upstream tunnel from
high pressure rise.
3. Water-Hammer Effect:
The water hammer is defined as the change in pressure rapidly above or below normal pressure
caused by sudden change in the rate of water flow through the pipe, according to the demand of
prime mover i.e. turbine.
Penstock:
Penstock is a closed pipe of steel or concrete for supplying water under pressure to the turbine.
Inlet Valve :
Water from the penstock flows to the turbine through the inlet valve. The valve may be partially
closed or open thereby regulating the pressure of water flowing to the turbine.
Hydraulic Turbine(Prime Mover) :
The hydraulic turbine converts the energy of water into mechanical energy. The mechanical
energy(rotation) available on the turbine shaft is coupled to the shaft of an electric generator and
electricity is produced. The water after performing the work on turbine blades is discharged
through the draft tube.The prime movers which are in common use are Pelton wheel, Francis
turbine and Kaplan turbine.
Draft Tube:
It is connected to the outlet of the turbine.It allows the turbine to be placed above the tail water
level.
Tail Water Level or Tail Race:
Tail water level is the water level after the discharge from the turbine. The discharged water is
sent to the river, thus the level of the river is the tail water level.
Electric Generator, Step-Up Transformer And Pylon:
As the water rushes through the turbine, it spins the turbine shaft, which is coupled to the electric
generator. The generator has a rotating electromagnet called a rotor and a stationary part called a
stator. The rotor creates a magnetic field that produces an electric charge in the stator. The
charge is transmitted as electricity. The step-up transformer increases the voltage of the current
coming from the stator. The electricity is distributed through power lines also called as pylon.
4. Classification of Hydro Electric Power Plants:
Hydro –electric power plants are usually classified according to the available head of water.
High Head Power Plants:
Head of water is more than 500 meters. The turbine used in such plants is Pelton wheel.
Medium Head Power Plants:
Head of water ranges from 80 to 500 meters. The turbine used in such plants is Francis turbine.
Low Head Power Plants:
Head of water ranges from 1.5 to 80 metres. The turbine used in such plants is Kaplan turbine
and Francis turbine.
Advantages Of Hydel Power Plant:
1. Water is a renewable energy source.
2. Maintenance and operation charges are very low.
3. The efficiency of the plant does not change with age.
4. In addition to power generation, hydro-electric power plants are also useful for flood
control, irrigation purposes, fishery and recreation.
5. Have a longer life(100 to 125 years) as they operate at atmospheric temperature.
6. Water stored in the hydro-electric power plants can also be used for domestic water
supply.
7. Since hydro-electric power plants run at low speeds(300 to 400 rpm) there is no
requirement of special alloy steel construction materials or specialised mechanical
maintenance.
DisadvantagesOfHydel PowerPlant :
1. The initial cost of the plant is very high.
2. Since they are located far away from the load centre, cost of transmission lines and
transmission losses will be more.
3. During drought season the power production may be reduced or even stopped due to
insufficient water in the reservoir.
4. Water in the reservoir is lost by evaporation.
Comments:
1. It is very important remember that the work also components of Hydropower plant.
2. We learn about power plant Turbines.
3. Very good experience in this procedure.