Senin, 21 Juni 2010

Generator Kva

Diesel Generators Can Be Used in Many Industries

Many people prefer diesel when compared to gas because it has higher energy density, diesel fuel is heavier, oilier and has a higher boiling point when compared to gas. Modern diesel generators have less noise. In the present scenario, there are different types of diesel engine generators.
Small portable diesel generators range from 1 kva to 10 kva. Large industrial generators range from 8 kva - 30kva for homes, small shops and offices. This type of generator can work for longer period of time and requires less maintenance when compared to gasoline generator.
Diesel generators operate in a similar way as diesel engines. Diesel engines comprises of 2-stroke and 4-stroke operation. 4-stroke operation is used in diesel generators. Diesel generators may require larger store of fuel but this is much safer to store than gasoline. Basically there are two types of diesel generators: open frame and close frame.
Diesel Generators to the Rescue!
Most homeowners have always thought diesel generators were priced out of their reach. Diesel generators are much more reliable than other fuel types if they are used correctly. A diesel generator is designed to work at around 75% of the maximum load. Diesel generators come in all sizes from 1 kVA to 10 kVA for portable ones; from 8 kVA to 30 kVA for small commercial businesses and households; and anything up to 2000 kVA for hospitals, big buildings and manufacturing plants. Many people associate diesel generators with old, dirty noisy machines.
These days manufacturers have designed their diesel generators to be environmentally friendly and relatively maintenance-free. Another advantage of diesel generators is they are tougher and more reliable than their competitors and use up to 50% less fuel than gas powered generators.

Selasa, 20 April 2010

Automatic Voltage Regulator

Things You Should Know About Avr Generator.

Generator is electricity power plant, The main generator's problem is not permanent load for generator more loading is give to generator made the voltage going down,
generally the generator have a AVR ( Automatic Voltage Regulator ) who can working to raise and reduce voltage at generator, if aims the voltage output can be stabilize and constant,
AVR Generator reference voltage settings for the system of one phase/three phase, to arrange excitation voltage be passed to magnetic field circumference with aim to raise and reduce voltage of generator, if the load is added the voltage of generator will be drop, the excitation voltage will be increased to raise the voltage of generator.

Positive voltage build up from residual levels is ensured by the use of efficient semiconductors in the power circuitry of the AVR.

Frequency measuring circuit continually monitors the generator output frequency and provides under-speed protection of the excitation system. This is done by reducing the output voltage proportionally with speed below a pre-settable threshold, manual adjustment is provided for factory setting of the under frequency roll off point, This can be changed to 50 Hz or 60 Hz in the field by push-on link selection.

Wide range of stability settings are available to compensate for machine size and applications, 'slow' setting is available for applications involving single / twin cylinder engines and where lamp-flicker could be a problem.

Provision is made for the connection of remote voltage trimmer, allowing the user fine control of the generator's output voltage.

The AVR has the facility for droop CT (current tansformer) connection, to allow parallel running with other semilarly equipped generators.