Frequent blackouts in recent years increased demand for backup power solutions among homeowners and businesses. A power outage is more than spoiled food, loss of light or just an inconvenience; it is a potential life-threatening situation such as loss of air conditioning in the summer or heat in the winter, not to mention loss of power for electrically operated medical equipment.
A backup power source allows you to continue using essential appliances and lights during a blackout, or to supply electricity to the entire house. An engine-driven electric generator (or a genset) is the most common and the most inexpensive type of backup electricity sources. However, there is a considerable lack of knowledge about available types, technical details, sizing requirements and safety requirements of such devices.
This site is dedicated to information about various types of the generators.

WHAT IS A GENERATOR?

In power industry, "What Is Generator" term refers to a device that produces electrical energy. Although electricity does occur naturally, it does not exist in the forms that currently can be practically used. For practical use electricity is produced from other forms of energy. Since energy cannot be created but can only be transferred from one form to another, every generator obviously needs an energy source. In electric generators such source is mechanical energy. The mechanical energy in turn is converted from so-called primary sources, such as chemical or nuclear energy in various types of fuel, or obtained from renewable resources such as wind or falling water. The machine that converts primary energy into mechanical energy is called prime mover. Steam turbines, internal-combustion engines, gas combustion turbines, water and wind turbines are the common types of prime movers.

Sample Model Of A Generator


In electricity generation, an electric generator is a device that converts mechanical energy to electrical energy. This is done by a Engine it may be a Diesel Engine or Petrol or any device. A generator forces electrons in the windings to flow through the external electrical circuit. An engine-generator is the combination of an electrical generator and an engine (prime mover) mounted together to form a single piece of self-contained equipment. The engines used are usually piston engines, but gas turbines can also be used. Many different versions are available - ranging from very small portable petrol powered sets to large turbine installations.



An engine-generator is the combination of an electrical generator and an engine (prime mover) mounted together to form a single piece of equipment. This combination is also called an engine-generator set or a gen-set. In many contexts, the engine is taken for granted and the combined unit is simply called a generator.


In addition to the engine and generator, engine-generators generally include a fuel supply, a constant engine speed regulator (governor) and a generator voltage regulator, cooling and exhaust systems, and lubrication system. Units larger than about 1 kW rating often have a battery and electric starter motor; very large units may start with compressed air either to an air driven starter motor or introduced directly to the engine cylinders to initiate engine rotation. Standby power generating units often include an automatic starting system and a transfer switch to disconnect the load from the utility power source when there is a power failure and connect it to the generator.



Engine-generators are available in a wide range of power ratings. These include small, hand-portable units that can supply several hundred watts of power, hand-cart mounted units, as pictured below, that can supply several thousand watts and stationary or trailer-mounted units that can supply over a million watts. Regardless of the size, generators may run on gasoline, diesel, natural gas, propane, bio-diesel, sewage gas or hydrogen. Most of the smaller units are usually built to use gasoline (petrol) as a fuel, and the larger ones have various fuel types, including diesel, natural gas and propane (liquid or gas). Some engines may also operate on diesel and gas simultaneously (bi-fuel operation).

Some engine-generators use a turbine as the engine, such as the industrial gas turbines used in peaking power plants and the micro-turbines used in some hybrid electric buses.

Other engine-generators use a steam engine, such as most coal-powered fossil-fuel power plants.

Other engine-generators use a reciprocating engine.

The generator voltage (volts), frequency (Hz) and power (watts) ratings are selected to suit the load that will be connected.

Engine driven generators fueled on natural gas fuel often form the heart of small scale less than 1,000 kW combined heat and power installations.

There are only a few portable three-phase generator models available in the US. Most of the portable units available are single phase power only and most of the three-phase generators manufactured are large industrial type generators. In other countries where three-phase power is more common in households, portable generators are available from a few kW and upwards.

Portable engine-generators may require an external power conditioner to safely operate some types of electronic equipment. Small portable generators may use an inverter. Inverter models can run at slower RPMs to generate the power that is necessary, thus reducing the noise of the engine and making it more fuel-efficient. Inverter generators are best to power sensitive electronic devices such as computers and lights that use a ballast.

The mid-size stationary engine-generator pictured here is a 100 kVA set which produces 415 V at around 110 A. It is powered by a 6.7 liter turbocharged Perkins Phaser 1000 Series engine, and consumes approximately 27 liters of fuel an hour, on a 400 liter tank. Diesel engines in the UK can run on red diesel and rotate at 1,500 or 3,000 rpm. This produces power at a frequency of 50 Hz, which is the frequency used in the UK. In areas where the power frequency is 60 Hz (United States), generators rotate at 1,800 rpm or another divisor of 3600. Diesel engine-generator sets operated at their peak efficiency point can produce between 3 and 4 kilowatthours of electrical energy for each liter of diesel fuel consumed, with lower efficiency at part load.


Engine-generators are used to supply electrical power in places where utility (central station) power is not available, or where power is needed only temporarily. Small generators are sometimes used to supply power tools at construction sites. Trailer-mounted generators supply power for temporary installations of lighting, sound amplification systems, amusement rides etc.

Standby power generators are permanently installed and kept ready to supply power to critical loads during temporary interruptions of the utility power supply. Hospitals, communications service installations, data processing centers, sewage pumping stations and many other important facilities are equipped with standby power generators. Some standby power generators can automatically detect the loss of grid power, start the motor, run using fuel from a natural gas line, detect when grid power is restored, and then turn itself off -- with no human interaction.

Privately-owned generators are especially popular in areas where grid power is undependable or unavailable.




Trailer-mounted generators can be towed to disaster areas where grid power has been temporarily disrupted.



HOW IT WORKS.
The operation of electric generators is based on the phenomenon of electromagnetic induction: whenever a conductor moves relative to a magnetic field, voltage is induced in the conductor. Particularly, if a magnet is spinning inside a coil, AC voltage is induced in the coil. For more details, see How generators work: a tutorial with an animation that illustrates the basic operation.

The induced voltage (called electromotive force or emf) will create a current through an external circuit connected to the coil, resulting in energy being delivered to the load. Thus, the mechanical energy that rotates the source of the magnetic field is converted into electrical energy. Note that the load current in turn creates a magnetic field that opposes the change in the flux of the coil, so the coil opposes the motion. The higher the current, the larger the force that must be applied to the magnet to keep it from slowing down.

In practice, the magnetic field is most often induced by an electromagnet rather then a permanent magnet. In AC systems, usually the electromagnet is spinning, and the power-producing armature is stationary. The armature normally comprises of a set of coils that form a cylinder. The electromagnet consists of so called field coils mounted on an iron core. A current flow in the field coils is required to produce magnetic field. This current may be obtained from an external source or from the system's own armature. Most modern AC sources with field coils are self-excited: the current for field coils is supplied by an additional exciting winding in the armature. The initial magnetic field is produced by residual magnetism in the electromagnet's cores. When the prime mover starts turning the armature, at first the armature rotates in a very weak magnetic field and produces small emf. This emf creates a current in field coils, which increases magnetic flux, which in turn increases emf in the armature. This process continues until the rated output voltage is reached.
If the electromagnet's core lost its residual magnetism, the rotor will spin, but no output voltage will be produced. In this case, to start the device you may need to do so called field flashing.

EMERGENCY BACKUP GENSETS.

In power plants the generators are most often driven by steam or hydraulic turbines or by diesel engines. The same concept of converting mechanical energy into electric energy is widely used in small privately owned units as well. In commercially available models for home or business use, an alternator is integrated with an internal-combustion engine into a single appliance. The resulting device is referred to as an engine-generator set or a genset. It is the most common type of backup power source for home or business. A genset is often casually called just a generator even though it also includes an engine. There are two main types of such devices that differ by their connection and activation methods: standby and portable. Standby generators for home use are permanently connected to the house wiring system via a transfer switch and are also permanently connected to a fuel source, such as a natural gas line or a large propane or diesel tank. They cost more than portables and require professional installation, but they can provide continuous power for as long as the fuel is available (see standby brands and ratings). Portable devices are intended primarily for a temporary connection to several appliances via extension cords rather than to the whole house. They are normally fueled from an on-board tank and therefore need frequent refueling. Some more expensive portable models can also be powered from an external source for extended run time (see portable brands and ratings). A portable unit is generally cheaper than a standby and does not need a professional installation unless you want to connect it directly to the house wiring (in which case you need to install a generator transfer switch). Choosing the best device for your application involves selecting the right type and a proper sizing based on the amount of power you may need during an emergency.

Electrical Generator

A device that converts mechanical energy to electrical energy is known has electrical generator and the reverse conversion i.e electrical energy to mechanical energy is done through a motor. Generator and motor has many same similarities in there process. A generator cannot create any external current (or) electricity even though with the help of its external winding and electrical circuits.A generator has to be rotated with a device attached to it with Approximately 1500rpm(rotations per minute) speed to get maximum power output.

New technology Diesel Generators for lease or Diesel Generator For rent

We supply 15KVA to 125KVA soundproof generator for rent,open diesel generator for lease and we also generator for sale with affordable prizes. We provide diesel generator on contract basis contact:9703442939

Electrical Power Calculators

The following calculators are provided to help you determine the size of generator required for your specific application. Other calculators on this page are for unit conversions and other power related calculations.

Calculation

Power Calculator

Converting kVA to kW

Converting kW to kVA

Converting kW to HP

Amperes when kVA is known

kVA Required to run motors

Guide to Standard Units

Kilo Volt Amperes	kVA
KiloWatts (1000 watts = 1 kW)	kW
Ampere (Volt-Amperes or Current)	I
Volts	E
Power Factor	PE
Percent Efficiency	%EFF
Horse Power	HP

Electric Power Generators

With so many different applications, electric power generators are increasingly becoming used as portable energy sources as well as emergency fail-safe ones. Electric generators are used in different locations including RV and mobile home power sources, commercial properties where fail-safe energy is needed which includes casinos and hospitals, and even government properties like dams and nuclear power plants, although these last locations will use much more costly and powerful generators.
Power generators are great products to help maintain electricity in homes during prolonged blackouts. They can keep the whole house powered or just certain appliances like refrigerators and freezers. Casinos use high electrical generators as backups to keep all slot machines and computers powered and hospitals have to have high powered generators to keep critical medical machines running. Government offices use extremely powerful backup generators to secure all necessary locations. Now that some of the useful applications of electric generators have been presented, lets discover the types of electrical generators.