why do we select ac supply to travel long distances ,i,e. why don't we use dc supply as it can also pass currents in a cable.
Actually the first type used Ignitron tubes before S.S./SCR's.High voltage DC transmission wasn't practical until the development of high voltage solid-state inverters . .
Ac allows the ability to compensate for voltage losses along the way by adjusting Xformer ratios. And as stated, allows any voltage option just be changing turns ratio.AC is used because it is easily changes from one voltage to another by a simple transformer system.
That can't be done with DC on the mass usage scale.
Unless something new has been invented. Other than static machines. I believe all generators produce ac.thanq,
can you tell me if it is possible to use it,and some says it is efficient,why don't we use dc generators so that output is dc and use it for transmission.
are there any more major difficulties in doing so,other than transformer advantage utilization.
Actually not really, they have one in the electrical museum in my town, runs self contained with a self exited field and results in a clean DC signal.but I would think the early Edison DC system had a large AC component. (ripple)
Post a link if you find one.Actually not really, they have one in the electrical museum in my town, runs self contained with a self exited field and results in a clean DC signal.
Max.
Mostly it has to do with the high voltage DC transmissions systems running on DC voltages of 500,000 to 1 million volts. Its just not practical/possible to build a DC generator that an create that voltage.thanq,
can you tell me if it is possible to use it,and some says it is efficient,why don't we use dc generators so that output is dc and use it for transmission.
are there any more major difficulties in doing so,other than transformer advantage utilization.
The main problem here is that it is really hard to make a rotating generator that produces high enough voltage to be useful for long distance transmission. You need hunreds of kV for it to be efficient, and the isolation in the windings just can´t stand that much easily.thanq,
can you tell me if it is possible to use it,and some says it is efficient,why don't we use dc generators so that output is dc and use it for transmission.
are there any more major difficulties in doing so,other than transformer advantage utilization.
There are a few reasons, easier starting method for one, a fluorescent tube will work with DC once the arc is struck, but the brightness will vary from end to end, anode to cathode, visible on a long tube.Why do some devices require ac power like tube light (why don't it work with dc)
while some other converts the available ac into dc and then use it.
The latest DC transmission line under way here is 1400Km at 500Kv!but figure the capacitance of a 100 mile line to ground.
by Aaron Carman
by Aaron Carman
by Jake Hertz