First, the Variac is not a transformer in the classical sense, it is an
autoformer or auto-trans-former. It will not lose efficiency. Here is a
schematic of one and perhaps you can see why it won't lose efficiency.
A common transformer has less efficiency than an autoformer due to core
loses, eddy currents, hysteresis, more heat (I2R losses), etc.
Ros, W5BRY
On 7/22/2015 8:28 PM, Steve Bookout wrote:
Hello all,
Thanks to everyone for the informative responses. Although I've now
got more info to use in order to figure out what I am going to do, I'm
not sure what that will be.
It's really just a bit 'hot' for my needs and if I turn it down with a
variac, regulation may suffer. I do have a stack of two variacs on a
common shaft, and although they are large, I don't know what their
actual specs are. Something for me to check.
73 de Steve, NR4M
On 7/21/2015 03:03 , Steve Bookout wrote:
Hello all.
Question for the experts.
How does using a Variac to control the output of a HV transformer
affect things like efficiency?
I think it would be reasonable to think that a transformer operated
at less than rated input voltage would be less efficient than one run
at full primary voltage. I mean, it cost 'something' just to make a
transformer act like a transformer.
I ask because I have a perfectly fine 'pole pig' transformer rated at
5 KVA. 7200 AC volts on the output (reversed) is a bit much for my
needs, so was wondering what the trade-off would be if it were run at
considerably less than 220 input.
I can see this is a better xformer for a 4cx10000, than anything I
would be using, but I have what I have.
73 de Steve, NR4M
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