Hello Karl-Arne,
I'll second that in a heart beat. When I arrived in Canada from Sweden 1982,
the electrical system on this side of the pond really surprised me. It's
unfortunately a very old fashioned system we seem to be stuck with.
I remember when we bought our first house, looking at the electrical wiring
gave me night mares. The house was less than 20 years old and the wiring
looked like a cobb web. 20 years later it still looks the same in new
housing, which I find remarkable and surprising.
As an example, to get 120V and 240V to the house, which by the way is the
same phase, the power distributor uses "pole pigs" or other type of
transformers for 240V with a center tap to get 2x120V. It's really
surprising that it's working at all.
I hope I'm not sounding too negative, I love my new country. After living in
Europe, in this case Sweden for 40 years, I guess you have a different view
of this issue. The world is full of surprises, so let's see what's
happening.
Hopefully, I didn't upset any of my friends on this side of the pond.
73s Bert, VE3OBU/SM7BUR
PS. All Swedish and most other European homes have 3-phase electrical power.
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of Karl-Arne Markström
Sent: Sunday, November 16, 2003 6:07 AM
To: amps@contesting.com
Subject: Re: [Amps] Benefits of 3-phase power?
Gentlemen,
I can second your observation that 3-phase power feed is superior to
single-phase.
When power levels much more than 1 kVA input are used,
it is possible to observe poor AC regulation with keying even on European
standard 230V outlets.
If constant power regulated switch-mode power supplies, such as in the
Collins HF-8023/32, are used,
the lowered input voltage will be compensated by a higher line current,
making the situation worse.
There is a marked difference in AC line regulation when comparing
transmitters with the same output power
using 3-phase and 1-phase connections. My own Standard Radio SSA1000 1 kW+
transmitter for example,
using a 3-phase 230/400 V AC feed, does not blink any lights in the house
even when transmitting full power into a mismatch.
It appears that the standard European practice to provide 3-phase 230/400 V
power,
usually fused at 20A or 25A per phase,even to small dwellings
is a blessing for the QRO enthusiast.
73/
Karl-Arne
SM0AOM
----- Original Message -----
From: <ka1xo@juno.com>
To: <genewill@ordata.com>
Cc: <amps@contesting.com>
Sent: Sunday, November 16, 2003 8:22 AM
Subject: Re: [Amps] Benefits of 3-phase power?
>
> Dear Gene,
> Having been fortunate to have 3-phase power available in the lab where we
Type-Accepted DC Powerplants for cellular transmit sites I took advantage of
the situation and hooked up a strip chart recorder to the three hot legs of
the 5-wire service and to the three wire service of the split single phase
mains supply to be able to tell the customer about sags and surges. While
both services suffered equal amounts of transient pulses, measurable from 3
nS up to 1mS, and in equal amplitude, the three-phase service suffered less
than one-third the amount of events from 1mS to 1S. The customer decided to
bring in 3-phase power to as many sites as were possible, the big hurdle
being the nearby availability of three-phase lines in the street.
>
> The everyday advantage to using 3-phase mains is smaller wire diameter and
lighter motor frames for the same HP.
>
> But who has 3-phase going to their house?
>
> Hal
> KA1XO
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