what is the purpose 208V AC power?

Question

Why not just use 240V? It seems simpler to have three evenly powered phases any of which can be paired with any other resulting in 240V power. Do certain applications require 208V? How do you know which type of service you have in your home?

I understand more or less HOW it is made (i.e. the high leg in the three-phase system - it just seems strange to have this odd leg - it seems like it would throw off the symetry of the 3-phase "braid."

also what would happen if the delta leg were paired witha regular 120 leg by accident?

Answer 1

The main purpose for the utility companies to install
the 3 phase-"delta grounded"-120v/240v/stinger leg system was to provide commercial establishments with convenience power (120v for outlets) and lighting circuits power (stinger leg 240 v) but it never work, it was a mess burn appliances, a lot of empty unused spaces in the power panels, and a lot of complication when trouble shooting. this systems are residuals of the all ready abandoned Delta grounded configuration. (this is true for California, I don't know the status in other states).
a correction has to be made because there is no such a thing as 208v delta grounded because the 208v results when the center tap is made for the neutral to ground bound. 120v/208v start center tap configuration. this is the most efficient for distribution of commercial power distribution and it is the most widely used in California it holds true for all the new installations in commercial and warehousing buildings power systems.

Answer 2

I assume you are familiar with the phasor diagram for voltages .... http://mysite.du.edu/~jcalvert/tech/wyedelta.gif
Now I'm not sure whether I fully understand what you do not understand, but let's assume we want to take two phase wires and neutral to make a three-wire household service supplying 120 V between each hot wire and ground. The neutral will become the grounded conductor, the two phases the hot conductors. Then, the wye voltage is 120, so the delta voltage will be √3 x 120 = 208 V. This is the three-phase line voltage necessary in this case.
Note that the two 120 V sources are not opposite in phase, and will not give 240 V between them. On the other hand, suppose we do want a 240 V service. Then this must be the line voltage, and the voltages to neutral will be 139 V, not 120 V. A 120 V three-phase service will give only 69 V from line to neutral. Note that √3 appears everywhere, and that the differences in phase explain the unexpected results.
Hope that helps....

Answer 3

Hi There, Your AC adapter supplies power to operate your computer while recharging your laptop battery. Usually whenever you are using your computer at your desk you can just leave the AC power adapter plugged in so your battery will be charged up whenever you want to take your computer with you. Your battery (once it is fully charged up) will run your laptop for about 2-3 hours even when the ac adapter is not plugged itnto the laptop. That is what makes your computer "portable". To make your computer's battery last longer without recharging only run your wireless when you want to connect to a wireless signal. If you read the information that came with your computer it will tell you how to turn it off and back on when you need it. Don't worry we were all technically challenged when we first started. However you can become an expert by reading all the information also by searching Windows Help and Support on your machine. Just click on "Start" then click again on "Help and Support". When that dialog box opens up it will have a search box where you can type in your question (very much like Google). Hope this helps you. enjoy your new computer, Al

Answer 4

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RE:
what is the purpose 208V AC power?
Why not just use 240V? It seems simpler to have three evenly powered phases any of which can be paired with any other resulting in 240V power. Do certain applications require 208V? How do you know which type of service you have in your home?

I understand more or less HOW it is made (i.e. the...

Answer 5

Three-phase power is produced by having an alternator with 3 windings, each with the same number of turns, spaced 120 degrees apart. This causes the voltage waveforms to be identical, but spaced 120 degrees (or 2 * pi / 3 radians) apart.

There are two sensible ways that you can connect the secondary windings of a three-phase transformer: the "star" or "Y" configuration (which has a neutral point), and the "delta" configuration (which has no neutral point). In "star" configuration, the voltage between any two phases = the voltage between phase and neutral * the square root of 3. (You can prove this to yourself; recall that the phases are 120 degrees apart. Draw voltage-time graphs if it helps.)

So, if the voltage between phase and neutral is 120V, then you will get 208V between any two phases.

Answer 6

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An AC power adapter will convert AC (alternating current) to DC (direct current).

Answer 7

208v Power