Power Distribution in Japan

[dabatman]

I was looking at a project in Japan and was wondering how their power distribution works exactly. All of the documentation I can find online shows a 3-phase power system with only 3-wires+gnd with the voltage being 100/200V. So I have two questions:

1) Is everything in a Delta configuration?
2) If my load is 20kW then is the current on each line 57A coming from the Load divided by 1.73*Voltage line-line so 20000/(1.73*200)?
3) Some of the documentation I can find mentions a neutral wire, but I guess I don't see how that comes into play? Does Japan have some split-phase systems also?
4) If I do have to step down from a bigger transformer, is it 600-200 3-phase step-down or what kind of transformer would that be?

Any kind of links to websites or answers would be appreciated. I'm mainly looking at how the power system actually works.

 

[dbuckley]

You need to know where in Japan; Japan has two power systems, one 50Hz, one 60Hz...

 

[ohmhead]

Well good question go here http://www.nunome.co.jp/en/products/domestic/index.html

I like to see how others do or use there electrical also.

Meaning in other parts of our world it seems if you look at there transformers from the factory diagrams that they have 3 phase primarys but mostly use single phase on there secondarys for low voltage equipment like household power 100 volts is common and 200 volts 60 hz and 50 hz is split up in japan some parts as stated have one or the other but if you look at some transformers mostly made in china there multi freq they operate at both cycles .

The taps or connections are a little bit different then ours just look at the connections dyn ydn but then transformer seccondary windings have mutiple taps different then our taps for different voltages look at the taps .

To me freq is what it is but voltage is a transformers job just changes voltage to suit its load in any country different windings at any voltage needed .