| Electronics > Beginners |
| Is there a particular reason Japan is 100 volts? |
| << < (8/8) |
| glarsson:
In a couple of years the US will have reached 230V. This stepvise increase is a trick to fool everyone into the new world order. |
| 6PTsocket:
--- Quote from: filssavi on August 30, 2018, 02:29:31 pm ---The only switch that would kind of make sense with the current state of power electronic would be to switch from AC to DC for distribution, not regular transmission, there AC is still going strong for now. The great majority of loads right now (I don't have numbers but I bet is over 80% of the total residental and small industrial installed power) rectify the AC to DC anyway, and especially in residential use the conversion efficiencies are quite low. switches will get bigger but they are being replaced by semiconductors anyway Circuit creakers will get bigger, but it is not the end of the world Unfortunately this will probably never happen since the costs would be way to high and so we will keep 240V/50Hz or 120V/60Hz forever I think --- End quote --- That mught be OK in a switching power supply that rectifies as a first step but any low voltage DC device with a linear supply would need an inverter to go back to AC to step it down or up for higher voltage. It is the ability to transform voltages to different values, like down from high tension transmission lines, with low IR losses, that helped doom DC transmission, in spite of Edison killing a lot of animals and inventing the electric chair to demonstrate the dangers of AC. Sent from my SM-G900V using Tapatalk |
| basinstreetdesign:
--- Quote from: jmelson on August 30, 2018, 06:50:09 pm --- --- Quote from: rstofer on August 30, 2018, 01:08:02 pm ---Niagara Falls used to generate 25 Hz and parts of New York City continued using it up until the early 2000s. I'm pretty sure it is gone now since the hydro plant stopped making it in 2006 --- End quote --- This was sent a lot farther than New York. We had a converter station in St. Louis, MO that created ~60Hz from the 25 Hz Ontario Hydro power, for use in large downtown buildings. They also apparently used the 25 Hz directly for elevators, etc. This was in use into the 1980's at least. The May company (department store chain) had a data center there that was fed from THREE different substations, and the wild ground potentials caused all manner of trouble, including cables that got too hot to touch, and people getting knocked to the ground when plugging or unplugging cables. Jon --- End quote --- More than Niagara Falls. When I worked in a (failing) gold/copper mine in South Porcupine, ON near Timmins in Northern Ontario in 1971, half the place was on 25 Hz and half was on 60 Hz. They had an electrical plant that was very impressive with 25 Hz rotating machines sunk halfway into the floor. Even then they were as tall as me. They rotated at something like 125 RPM. There was a famous light bulb there running on 25 Hz that had been in service since the middle 1920's. The whole place is gone now. Just before the surface mill was to be torn down the local librarian/historian was invited to come, take anything he wanted to preserve. He was given all of 24 hours. |
| Navigation |
| Message Index |
| Previous page |