Electronics > Beginners

Is there a particular reason Japan is 100 volts?

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GeorgeOfTheJungle:

--- Quote from: glarsson on August 30, 2018, 12:28:44 pm ---Before the EU change the voltage was a bit above 220V, now it is a bit above 230V. Usually I see about 235V.

--- End quote ---

Don't tell that to the remainers, please >:D

rstofer:

--- Quote from: tooki on August 30, 2018, 09:50:41 am ---And of course, there were also some system voltages that simply died out over time. Isn’t there still some weird low-frequency AC in some parts of USA for industry or something?

--- End quote ---

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

https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4412948

60 Hz is our competitive advantage over the 50 Hz world.  It takes less iron to make motors and transformers thus saving costs.  Besides, we work just a little faster.

tooki:
Why can’t we use higher frequency (for example, the 400Hz used on aircraft) for everything?

glarsson:
Larger transmission losses. Aircrafts are smaller and has low weight as a priority. Electric trains are the opposite. Long lines and weight is an advantage and, in many countries, use 16 2/3 Hz.

filssavi:
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

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