23-11-2012, 12:11 PM
Mahi Hydel Power Plant
Mahi Hydel Power.ppt (Size: 924.5 KB / Downloads: 40)
Introduction
Converts potential energy of water at a high level into electrical energy.
The Mahi hydel project was started in 1983.
In India 30% of total electricity generation capacity is produced by hydel power plant.
Mahi hydel power plant consists two units each have 25MW, 11KV generation capacity.
Sizes of Hydropower Plants
Large plants : capacity >30 MW
Small Plants : capacity b/w 100 kW to 30 MW
Micro Plants : capacity up to 100 kW
Dam:- Dam is a barrier which stores water and creates water head.
Reservoir:-A reservoir is a artificial lake which is used to store water.
Spillway:-spillway is a structure used to provide the controlled release of flows from a dam into a downstream area.
Penstock:-A penstock is a gate that carry water to the turbines.
Automatic Butterfly Valve:-It maintains the air pressure inside the penstock equal to outside pressure.
Power House:-Power station contains a turbine coupled to a generator. The water brought to the power station rotates the vanes of the turbine producing torque and rotation of turbine shaft. This rotational torque is transferred to the generator and is converted into electricity.
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.
Advantages:-
This plant is free from pollution.
Its operation and maintenance cost is less.
Its running cost is low.
Unit cost of power is less.
Hydraulic turbines can be started speedily.
The plant has longer service life.
No fuel is required.
No change in efficiency with the age.
Disadvantages:-
Requires large areas.
High capital cost.
Skilled and experienced hands are required to build plant.
High transmission lines cost.