Rotor

The rotor is the non-stationary part of a rotary electric motor, electric generator or alternator, which rotates because the wires and magnetic field of the motor are arranged so that a torque is developed about the rotor's axis. In some designs, the rotor can act to serve as the motor's armature, across which the input voltage is supplied. The stationary part of an electric motor is the stator. A common problem is called cogging torque.

Gordon Dam - Gordon River Dam

Gordon Dam is just a few kilometers from the settlement of the power plant workers
called Strathgordon. From a lookout you have a good view to the dam. - australiapics.com

The Gordon Dam (also known as Gordon River Dam), is a double curvature arch dam on the Gordon River in Tasmania, Australia. The dam has a length of 192 m (630 ft), and a height of 140 m (459 ft),making it the tallest dam in Tasmania and the fifth-tallest in Australia.

Water from the dam drops 183 m (600 ft) underground into its power station, where three turbines of 144 MW generates up to 432 MW of power, covering about 13% of the electricity demand of Tasmania. The first two turbines were commissioned in 1978, before the third was commissioned a decade later in 1988.

The power station is fuelled by water from Lake Gordon. Water from Lake Pedder is also drawn into Lake Gordon through the McPartlans Pass Canal at 42°50′51″S 146°11′45″E.

ADVANTAGES AND DISADVANTAGES OF HYDROPOWER

ADVANTAGES:

1. Once a dam is constructed, electricity can be produced at a constant rate.
2. If electricity is not needed, the sluice gates can be shut, stopping electricity generation. The water can be saved for use another time when electricity demand is high.
3. Dams are designed to last many decades and so can contribute to the generation of electricity for many years / decades.
4. The lake that forms behind the dam can be used for water sports and leisure / pleasure activities. Often large dams become tourist attractions in their own right.
5. The lake's water can be used for irrigation purposes.
6. The build up of water in the lake means that energy can be stored until needed, when the water is released to produce electricity.
7. When in use, electricity produced by dam systems do not produce green house gases. They do not pollute the atmosphere.

DISADVANATGES:

1. Dams are extremely expensive to build and must be built to a very high standard.
2. The high cost of dam construction means that they must operate for many decades to become profitable.
3. The flooding of large areas of land means that the natural environment is destroyed.
4. People living in villages and towns that are in the valley to be flooded, must move out. This means that they lose their farms and businesses. In some countries, people are forcibly removed so that hydro-power schemes can go ahead.
5. The building of large dams can cause serious geological damage. For example, the building of the Hoover Dam in the USA triggered a number of earth quakes and has depressed the earth’s surface at its location.
6. Although modern planning and design of dams is good, in the past old dams have been known to be breached (the dam gives under the weight of water in the lake). This has led to deaths and flooding.
7. Dams built blocking the progress of a river in one country usually means that the water supply from the same river in the following country is out of their control. This can lead to serious problems between neighbouring countries.
8. Building a large dam alters the natural water table level. For example, the building of the Aswan Dam in Egypt has altered the level of the water table. This is slowly leading to damage of many of its ancient monuments as salts and destructive minerals are deposited in the stone work from ‘rising damp’ caused by the changing water table level.

source: technology student

Hydroelectricity

Hydroelectricity is the term referring to electricity generated by hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water. It is the most widely used form of renewable energy.

Once a hydroelectric complex is constructed, the project produces no direct waste, and has a considerably lower output level of the greenhouse gas carbon dioxide (CO2) than fossil fuel powered energy plants. Worldwide, an installed capacity of 777 GWe supplied 2998 TWh of hydroelectricity in 2006. This was approximately 20% of the world's electricity, and accounted for about 88% of electricity from renewable sources

Stator

The stator is the stationary part of a rotor system, found in an electric generator, electric motor and biological rotors.

Depending on the configuration of a spinning electromotive device the stator may act as the field magnet, interacting with the armature to create motion, or it may act as the armature, receiving its influence from moving field coils on the rotor.

The first DC generators (known as dynamos) and DC motors put the field coils on the stator, and the power generation or motive reaction coils on the rotor. This was necessary because a continuously moving power switch known as the commutator is needed to keep the field correctly aligned across the spinning rotor. The commutator must become larger and more robust as the current increases.

The stator of these devices may be either a permanent magnet or an electromagnet. Where the stator is an electromagnet, the coil which energizes it is known as the field coil or field winding.

An AC alternator is able to produce power across multiple high-current power generation coils connected in parallel, eliminating the need for the commutator. Placing the field coils on the rotor allows for an inexpensive slip ring mechanism to transfer high-voltage, low current power to the rotating field coil.

It consists of a steel frame enclosing a hollow cylindrical core (made up of laminations of silicon steel). The laminations are to reduce hysteresis and eddy current losses.

Activer Repeater for T24 Wireless Telemetry (T24-AR)

* Wireless Active Repeater module to increase or extend range and overall coverage
* Allows T24 telemetry transmission to span around obstacles such as buildings or walls, etc.
* IP65 rated NEMA4 protected
* Integrated PCB antenna
* Simple configuration via PC using base station & T24 Toolkit software
* Battery power supply or external power supply
* 1 year manufacturer’s warranty

Hydro

Hydro may refer to:

• shortened name for hydropower, derived from water - specifically hydroelectricity
• a word part meaning fluid - examples are Magnetohydrodynamics and Electrohydrodynamics
  
• a generic name for an electric utility
  
• a generic name for electricity and electricity service
  

Fast facts on Bakun Project

FAST FACTS

The Bakun Hydroelectric Dam is the second highest concrete faced rockfill dam in the world.

Bakun dam is 207 metres high with a reservoir surface area of nearly 70,000 hectares, about the size of Singapore.

The main civil works began in 2002 by Malaysia-China Hydro Joint Venture.

A workforce of just over 3000 are on site at the peak of construction activity.

Experts, engineers, specialists and consultants worldwide are involved in this mega-project.

Upon completion, the Bakun Dam will generate 2400MW of clean electricity.

Bakun Dam is emission-free and has a 0% impact on global warming.