1.most of the alternators generating supply voltage is 11kv.why?
2.most of the trans mission voltage is multiples of 11.why?
3.Is any web site avalible which is having electrical books avalible for free down load?
2007-03-21 02:50:15 · 5 answers · asked by biju c 1 in Science & Mathematics ➔ Engineering
Go to the Engineering Library and research the topic there. If you are an EE student and you don't understand these basic theories, perhaps you should switch to Liberal Arts!!
By the way, how is 26 Kv a multiple of 11?
2007-03-21 02:55:17 · answer #1 · answered by NJGuy 5 · 0⤊ 0⤋
The evolution of insulating materials has been the limiting factor in obtaining higher voltages from rotating electrical machines ever since they were first manufactured back in the late 1800s.
Materials with suitable dielectric strength and satisfactory mechanical properties for voltages above 15000 Vac are relatively recent - approximately from the mid-1980's onward or so, depending on the equipment manufacturer. Since most fo the installed generation base is older than that, the output voltage of the generators is often at or below the 15000 volt level.
Standardization of voltages is not complete, but there are certain values that appear (depending on the system frequency); 10kV and 11 kV are common on 50 Hz systems, while 13.2 kV and 13.8 kV are more common on 60 Hz systems.
There are generating facilities where the voltage at the machine terminals exceeds the 15000 volt level; most notably, there are 26.8 kV units on the 60 Hz system and 25 kV units on the 50 Hz system.
Transmission voltage is determined by the line losses developing between transformers. "Standard" transformer ratios of 10:1 or 20:1 are fairly common - although just about any ratio can be achieved (60 Hz systems have typical transmission levels of 460, 600, 1100, 2400, 4160, 6900, 13200, 13800, 26800, 50000, 100000, 250000, 500000, and 750000 volts).
2007-03-21 05:07:52 · answer #2 · answered by CanTexan 6 · 0⤊ 0⤋
The choice of 1.1kv is based on transmission loss and maximum distance between transformers.
The whole idea it to ensure that the voltage (in the US at least) enters the home at 240 volts AC (This is separated into two 120 volt AC circuits).
You can't start at that voltage level at the power plant because you wouldn't have any voltage by the time you got to home.
You may not be able to find whole books to down load but you can certainly get tons of information from wikipedia or a google search
2007-03-21 03:03:56 · answer #3 · answered by Ernie 4 · 1⤊ 0⤋
After differential equations (as a Math direction), a large style of the the remainder of the engineering curriculum is dedicated to employing differential equations to real-international engineering purposes. In that admire it does not get any harder. In some respects that is extra undemanding, on account which you have already found out the basics (differential equations) and often while employing what you comprehend to real-international purposes it type of feels extra undemanding. There are some courses the place even larger maths might desire to be found out yet not for many human beings of third and 4th 3 hundred and sixty 5 days engineering courses. .
2016-10-19 06:09:54 · answer #4 · answered by ? 4 · 0⤊ 0⤋
Please visit my blog for FREE
Medical/Engineering/Technical/Software/Mathematics eBooks
http://www.freetechbooksonthenet.blogspot.com
2007-03-23 23:55:22 · answer #5 · answered by vinod v 2 · 0⤊ 0⤋