Peter,
Most houses here are wired from the street backbone with 3 phase mains.
However, in the Utility fusebox only one phase is fused (standard 35
amps) and connected to the meter.
In order to get three phases one must purchase a 3 phase meter + having
the power company to install the remaining 2 fuses + meter. In my case
this has cost me 170 Euro.
Farms are all equipped with high amp three phase connections. How in
the world can a decent farm run on a single phase 230 mains?? Now I
understand why you guys need a "rebate" ;-))
Cheers, Dick
PA3DUV
----- Oorspronkelijk bericht -----
Van: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Datum: maandag, januari 2, 2006 3:52 pm
Onderwerp: Re: [Amps] How about this furnace?
> PA3DUV said:
> >On the EU mainland 20 kW input @3 phase mains with 400 VAC
> between the
> phases will result in 17 A per phase.
> I reckon from am a standard house mains inlet one can run a 30 kW
> amplifier and use the dishwasher, microwave and cook a decent stir
> fry
> wok at the same time.<
>
> and DF3KV said:
> >In a 3-phase environment which is standard nowadays in
> central Europe that is no problem at all, at 20KW input you
> need 28A per phase.<
> So guys, are you saying that on the Eu mainland, domestic
> properties are routinely provided with 3 phase mains?
> They certainly aren't in the UK, and as far as I'm aware, not as a
> matter of routine in the US. I suspect a request for installation
> in domestic properties would meet with some questions, especially
> with our new UK 'nanny state' electrical regulations. Even my
> neighbouring farm only has single phase in the farmhouses.
> The main supply to my house is fused at 100amps, (24kW at unity
> PF) although if you tried drawing that much, the voltage sag would
> hurt, as I'm on the end of the best part of 500 metres of overhead
> line from the transformer. It used be two phases from the
> transformer, but there's now 3 phases from a new transformer (it's
> fed from a an 11kV 3 phase overhead line) and two of them get to
> the pole outside my house. But only the neutral and 1 phase come
> in. To get 3 phases for the lathe and mill, I have a solid state
> inverter, although as it provides variable frequency, it provides
> variable speed, too.
> But the other point that needs considering in the current draw is
> the amplifier power factor. If that was 0.8, the current goes up
> by 1.25 times for the same power.
> And I still don't like the idea of the electricity bill!
> As far as corona is concerned, don't bet on it. The Quad
> originated at HCJB because 10kW led to corona off the ends of the
> Yagi they tried. Some locations you may get away with it, but I've
> seen problems with 1kW at 500kHz into a shorter than usual
> antenna. On my 80 and 160m vertical, I've been rebuilding the
> tuner since I changed the beam on top to a Steppir and reduced the
> capacitive loading. I had a beautiful blue glow inside my 500pF
> 15kV vacuum variable - does anyone rebuild or repump those? - and
> building padding capacitors witrh 0.064inch thick glass produced
> impressive fireworks and pinholes in the glass around the edges of
> the metal electrodes - and broken glass. That was with less than
> 1kW!!! A 7.5kV peak vacuum variable will just do it (I hope): for
> 10kW, I'd be talking in terms of 20kV plus at the antenna
> terminal......Incidentally, producing a suitable motorised
> mounting for the remote tuned vacuum variable has led to an
> enormous amount of swarf in the workshop: it just shows what can
> be achieved with economy and care! And a load of scrap metal where
> things didn't work out right. But that's another story............
>
>
> 73
>
> Peter G3RZP
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