Re: TC Power Voltages and Phases

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Richard Modistach" <hambone-at-dodo-dot-com.au> 

starve the lizards, after all of that
i'm glad i live in australia.
here we have basically 3 phase,
415v 120degrees
between any two phases,
any phase to a 4th neutral line
which is effectivly earth is 240v.
most streets have three phase runnung around
with houses taking 1 leg and a neutral for their supply,
whith businesses they take the 3 phase in for larger
motors, welders and wotnot and tap 240v at the
switchboard for other stuff like lighting and office
periphipals ect,ect.
if it's running past ones house getting 3 phase connected
on costs only a few hundred dollars for cabeling, meter, ect.

regards
richard
aus.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, January 06, 2004 10:47 AM
Subject: TC Power Voltages and Phases


 > Original poster: "John H. Couture" <couturejh-at-mgte-dot-com>
 >
 >
 > All -
 >
 > It appears that there is a lot of confusion over the electrical services
 > that are used in the US. Read the following to become more confused.
 >
 > The US utility power companies can furnish electrical phases as follows.
 >
 >     60 cycle = 1/60 = .016667 secs
 >
 > To visualize the wave cycles draw a 6 inch line as an axis for a sine wave
 > and mark it with zero to 360 degrees (first 1/60) at 3 inches to 720
degrees
 > (next 1/60) at 6 inches. During the first 1/60 second (0 to 360 degrees)
 > there would be one complete  1 phase sine wave voltage cycle. However, in
 > the two phase system the second voltage starts 90 degrees later. In the
 > three phase system the second voltage starts 120 degrees later and the
third
 > voltage starts 240 degrees later. The remainder of the 2 or 3 phase
systems
 > (sine waves) will occur in the succeeding 1/60 second. The reason for
these
 > complications is the rotating field in motors, another story. The rotating
 > fields have no advantages for Tesla coils.
 >
 >     1 phase -  120/240 - 3 wire
 >
 >     2 phases - 110/220 - 3 or 4 or 5 wire - 90 degrees
 >
 >     3 phases - 120/208 or 277/480 - 3 or 4 wire - 120 degrees
 >
 > There are many other service possibilities for customers including
2400/4160
 > volt, 12000 volt, etc. For example the three phase system can provide
three
 > 120 volt 1 phase circuits or one 208 volt 3 phase circuit or three 208
volt
 > 1 phase circuits. You can do the same with the 277/480 volt system.
 >
 > There are also 6 phase and other phases that are available but require
 > additional service equipment. Manufacturers with large DC demands use
these
 > systems because they have less DC ripple.
 >
 > A two phase, 5 wire system is an electrical service that I believe is
still
 > in service and motors are still available for these systems. I did some
 > engineering work on one of these systems many years ago.
 >
 > Note that the typical new house residential underground service today is
 > 120/208 volt, 3 wire, 1 phase, which is sometimes incorrectly called three
 > phase. These services are fed from pad mounted transformers that are rated
 > 120/208 volt, 3 phase.
 >
 > If the above doesn't confuse you enough try drawing the voltage waves of
all
 > phases together on the same axis. When you get bored with this then add in
 > the currents at the approximate 20% to 70% power factor of Tesla coils.
 >
 > Is anyone still reading this post?
 >
 >     John Couture
 >
 > ----------------------------------
 >
 >
 >