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...
In alt.engineering.electrical Tzortzakakis Dimitrios
wrote:
|
| ? ?????? ??? ??????
| ...
| In alt.engineering.electrical Tzortzakakis Dimitrios

| wrote:
|
| | A shame that Tesla won the infamous "battle" and we don't have DC:-()
| But
| | then, we would be having a power plant at each neighborhood, instead
of
| the
| | 300 MW ones.
|
| And the latter make easy terrorism targets, too.
|
| I cross my fingers that terrorists get no electrical engineering
degree:0

I suspect quite many already have them. Many have degrees in a lot of
other
things like chemistry and physics. Some even have doctoral level degrees.


| | I know, I know, my answer was a bit provocative:-) And of course
there
| are
| | DC regulators.... You're talking about DC generators;the one a 300 MW
| uses
| | for excitation is 220 V, 1000 A DC and probably shunt field. I have
seen
| | here in some machine shops the old type welding generator, which is a
3
| | phase induction motor coupled to (usually) a compound field DC
| generator,
| | which provides the welding current. The modern ones are, maybe, not
| larger
| | than a shoe box and powered by a higher wattage 230 V 16 A
receptacle.
| | (Usual receptacles are 230 V 10 A;16 A for washing machines, dryers
and
| the
| | like).
|
| You don't use 400 V for anything heavy duty like an oven?
|
| Yep. All ovens sold in EU are wired for 3 phase, 400 V with neutral (and
| earth, goes without saying). Just if you connect it on 1 phase (as
usually)
| you use a bridge, and connect all L1-L2-L3 to the one and only hot. 230
V is
| powerful enough for almost everything in a house, only large
airconditioners
| are 3 phase, and all industrial motors, even if they are 1HP:-) (

That means each element individually runs on 230 V and they just divided
them
up in three approximately equal sections, or use triple elements for each
type
of use.

How many things that have just ONE (large) element would have it available
in
both 230 V and 400 V versions?

Professional washing machines. One of my very first days 'in the field' was
to connect some of them. They have a large heating element, you can connect
it single phase, or 3 phase, it just heats up faster (of course) when you
connect it 3 phase. (they have a single phase motor, so it works also in
pure 230 V).


--
Tzortzakakis Dimitrios
major in electrical engineering
mechanized infantry reservist
hordad AT otenet DOT gr
NB:I killfile googlegroups.