We run 50Hz down here in ZL.
In my experience most amateur equipment eg SB220, TL922, my Viewstar PT2000A
run quite happily on 230v 50Hz.
Same goes for most relativley light duty equipment.
Every so often there is something that is unhappy on 50hz but this is rare,
typically symptoms are overheating and/or loss of regulation.
Some gear which is dedicated to 110v is run via step down transformers, but
this is typically light duty application.
I have just been over at Ken ZL1AIH place using his restored Heath Warrior
4x8111A running on 110v 50hz via a step down transformer and it is right on
spec.
I have never heard of a transformer burning out with just magnetising
current on 50Hz when it would run cool on 60Hz.
Did you call Peter Dahl on April 1st?
73
end
Barry Kirkwood PhD ZL1DD
Signal Hill Homestay
66 Cory Road
Palm Beach
Waiheke Island 1240
NEW ZEALAND
www.waiheke.co.nz/signal.htm
----- Original Message -----
From: measures <2@vc.net>
To: Ian White, G3SEK <g3sek@ifwtech.com>; AMPS <amps@contesting.com>
Sent: Saturday, 07 April, 2001 2:40 AM
Subject: Re: [AMPS] ALPHA 77SX on 50Hz
>
>Vic Rosenthal wrote:
>>
>>> ARNE GJERNING wrote:
>>>
>>> The other question is the concern of 50Hz vs 60Hz. Any problems here or
>>> precautions needed.
>>
>>I built a 3300v power supply with the intent to use it in a 50 Hz country
as
>>well as here in the US. I asked Peter Dahl about this. I was told that
the
>>magnetizing current in the primary of a large 60 Hz transformer operating
on
>50
>>Hz would be excessive, enough to burn it out. Much more iron is needed in
a
>50
>>Hz transformer -- the one I finally got weighed 60 pounds (27kg), compared
to
>an
>>equivalent 60 Hz only unit weighing 40 pounds (18 kg).
>
>Interesting figures... so the total weight of the transformer increases
>as something like the square of the core cross-sectional area. Seems
>about right.
? My TL-922 is designed 50 - 60 Hz. In my opinion, 50 - 60 Hz
transformer cores are about 20% heavier than equivalent 60Hz-only cores.
>
>And then the capacity of a blower with an AC induction motor DEcreases
>with about the square of the mains frequency.
good point
>It's small wonder that so
>much "50/60Hz" equipment is sweating when operated on 50Hz.
>Ian.
The work-around is to use a DC brushless fan.
>
>I wonder how many developers in the 60Hz hemisphere actually have the
>capability to test equipment at significant power on 50Hz?
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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