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There are a couple of points here. One is mentioned above. The other is the type of generator. A synchronous alternator is designed to generate power at a given frequency when rotated at a given speed by some external means such as a steam turbine or diesel. It is separately excited via DC and can provide its output alone (no need to be connected to the main grid). This is in contrast to an asynchronous generator such a a double fed induction generator often used in wind turbines which must be connected to an established grid in order to be able to generate power and will run slighlty above the synchronous speed by the slip necessary to deliver the required power.

[admin]

Hello,

We always use the departures of Schneider Tesys type, especially when a + 3 / 4 departures.

[admin]

   If you want to get more technical, there are calculations in the IEEE standard the Green book, Standard No. 142, chapter 2.

[admin]

   I have no idea what the sphere method is.  In the USA lightning protection gounding is determined by following the IEEE standard, the Green Book, Standard No. 142, Chapter 3.

[admin]

   Just about every ceiling fan here in the USA is 120 vac single phase.  Everyone just buys ceiling fans at large department stores like WalMart, K-Mart, Lowes, Home Depot or even smaller lumber yards or hardware stores.  Most motors are wound for three speeds and come with a switch to select the speed.  These fans are very low horsepower, maybe 1/6 or 1/8.  If you are going to actually make your own, keep it small and low speed.  You don't want it to heavy.

[admin]

  Not for sure what you really are asking.  When you connect a generator on line to an electric system, you have to make sure it is in sync with the system you are connecting to.  You use a synch check scope or meter to check between your generator and system before you close the breaker to tie in the generator.  The generator is usually connected to a steam turbine.  Here in the USA the turbine will be rotating at 3600 rpm, called synchronous speed.

[admin]

  If I understand this correctly you are going to ground a panel.  In the USA we follow the National Electric Code.  Per the code, the minimum size equipment grounding conductor is dictated by a table in the NEC.  Section 250, table 250.122.  It is based on the overcurrent protection on conductors feeding the panel.  No calculations required. – Alton Tupa

[admin]

Thanks to everyone for sharing useful information about Led street lightsing.

 

[admin]

Fluorescent bulbs contain mercury and pose a danger to the environment.Some may be required to pay for disposal of fluorescent bulbs.If the bulb breaks, it contaminates it's surroundings icluding food. Proper clean up can be expensive. led light bulbs use less energy than a Compact Fluorescent for the same light output.  led strip lighting

Fluorescent bulbs   contain mercury and pose a danger to the environment.Some may be required to pay for disposal of fluorescent bulbs.If the bulb breaks, it contaminates it's surroundings icluding food. Proper clean up can be expensive. led light bulbs use less energy than a Compact Fluorescent for the same light output.

[admin]

Solar power is a viable green energy source. However it is not a viable energy source for our

power needs. At the moment the only alternative we have is Fusion Power, until we achieve it

we just have to sit tight and make the best use possible of our current resources. led spotlight

[admin]

I've read. It is a very interesting document

[admin]

Fluorescent light bulbs (including compact fluorescents) are more energy-efficient than regular bulbs because of the different method they use to produce light. Regular bulbs (also known as incandescent bulbs) create light by heating a filament inside the bulb; the heat makes the filament white-hot, producing the light that you see. A lot of the energy used to create the heat that lights an incandescent bulb is wasted.

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Critical field resistance is a term that is associated with a shunt DC generator. In a DC Shunt Generator, the voltage induced across the Armature V_a is directly proportional to the Fluxacting across it, The Flux in a DC Generator is directly proportional to the field current I_f. By Ohm's Law V = IR . The critical field resistance is defined as The maximum field circuit resistance (for a given speed) with which the shunt generator would excite. The shunt generator will build up voltage only if field circuit resistance is less than critical field resistance.

It is a Tangent to the Open Circuit Characteristics of the Generator(at a given speed).

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LED lamps emit no Infrared or Ultraviolet radiation. CFLs (and tubular fluorescent lamps) generate light by exciting the Mercury vapor inside the lamp with electricity, generating Ultraviolet radiation, which stimulates the phosphor coating on the inner surface of the glass bulb, causing it to re-radiate most of the Ultraviolet radiation as visible light. LED lamps generally create “white” light by using blue LEDs and a phosphor coating which re-radiates some of the blue light as longer wavelength light (yellow range of the spectrum), together appearing as white.

LED lamps emit no Infrared or Ultraviolet radiation. CFLs (and tubular fluorescent lamps) generate light by exciting the Mercury vapor inside the lamp with electricity, generating Ultraviolet radiation, which stimulates the phosphor coating on the inner surface of the glass bulb, causing it to re-radiate most of the Ultraviolet radiation as visible light. LED lamps generally create “white” light by using blue LEDs and a phosphor coating which re-radiates some of the blue light as longer wavelength light (yellow range of the spectrum), together appearing as white.

[admin]

CFLs  has lower power cosumption(80%) and much longr life time(5 to 15times) but it disadventage are ,it longer start mainly at more expeansive type.

It is available usualy in these colour temperature

1)WAEM WHITE (2700K)

2)COOL WHTE(4000K)

3)DAY LIGHT(6000K).

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