PrecisionmachinisT wrote:
"Pete C." wrote in message
ster.com...
"Michael A. Terrell" wrote:
"Pete C." wrote:
"Michael A. Terrell" wrote:
"Pete C." wrote:
"Michael A. Terrell" wrote:
Cross-Slide wrote:
Maybe YOU are talking about an RPC, but the subject of the OP
is " VFD
question "
It doesn't matter, since the transformer goes before anything
else.
It operates at line voltage, and in Gunner's case at a constant
60 Hz.
It does matter, a set of transformers can most certainly come after
a
RPC, if you only have buck transformers large enough to handle the
three
phase current, not the single phase current.
Why would you put three after the RPC when one at the input ddoes
it
right? Are you that stupid?
I'm not stupid, but you may be if you are that clueless as to the
context and the point I made about the transformer sizing. If you have
for example three 1KVA transformers on hand but no 3KVA transformers,
it's a pretty easy choice to use the three you have downstream rather
than buy a new transformer to use upstream.
OK, if a hack job pleases you.
A "hack job" utilizing parts you already have on hand vs. spending money
buying new parts will please most HSM folks. We are talking HSM here,
not in a factory where you would have real three phase power anyway.
Even within a factory environment it is perfectly sound engineering to
parallel transformers.
Three transformers on the individual phases isn't 'parallel'.
Fact is, this is very commonly practiced at the utility substation as well
as individual customer distribution levels.
http://tinyurl.com/3bfr3ay
http://www.icmiinc.com/News.htm
Much of the residential distribution in the city of Campbell River, Canada
for example is tied together at the secondary voltage level with
triplex....240vac--there are literally hundreds of pole tranformers all
coneccted to a same triplex buss....with a transformer mounted to every
third pole or so depending on the actual number of houses per block.
--
--
You can't fix stupid. You can't even put a Band-Aid™ on it, because it's
Teflon coated.