John Thornton wrote:
> We picked up a free oversized transformer for our shop 3 phase and the inrush
> would trip the breaker so it was useless to us.
You could probably put light bulbs or reistors in series to
magnetize the transformer core in sync with the line, then shunt
the resistance out.
It should be possible to use a slightly higher current breaker or one with
longer time delay for magnetic devices? Failing that a knife switch with time
delay fuses should handle the job.
Rayh
On Thu, 18 Oct 2007 06:06:15 -0500, "Enhanced Machine Controller (EMC)"
said:
>We picked up a fr
Jim Coleman wrote:
> i was thinking the light bulb idea when i read it, i remember reading an
> article on a homebuilt 1000 watt audio amp, he did that because of the
> inrush current tripping a breaker. i was just wondering how many bulbs in
> parallel it would take to handle the current without
We picked up a free oversized transformer for our shop 3 phase and the inrush
would trip the breaker so it was useless to us.
John
On 17 Oct 2007 at 11:17, [EMAIL PROTECTED] wrote:
> Mark already said that the transformers are at least twice as
> big has he really needs.
>
> But they are free
i was thinking the light bulb idea when i read it, i remember reading an
article on a homebuilt 1000 watt audio amp, he did that because of the
inrush current tripping a breaker. i was just wondering how many bulbs in
parallel it would take to handle the current without blowing instantly?
thinking
Mark Pictor wrote:
> I knew there would be inrush current to the capacitors, but I
> didn't realize that the transformer, in and of itself, would have
> an inrush current. Guess that shows how much I know!
>
Yup. It varies with the transformer design, and if you end up
using a 240 V primary win
At 01:17 PM 10/17/2007, you wrote:
>I knew there would be inrush current to the capacitors, but I
>didn't realize that the transformer, in and of itself, would have
>an inrush current. Guess that shows how much I know!
>
>I was planning to use one or more motor run capacitors to limit
>inrush curr
I knew there would be inrush current to the capacitors, but I
didn't realize that the transformer, in and of itself, would have
an inrush current. Guess that shows how much I know!
I was planning to use one or more motor run capacitors to limit
inrush current - use a relay in parallel with the ca
I don't have my figures, but I remember looking for a 3kva
isolation transformer before. This is a little more than twice
that size, as I mentioned in the OP. Now that I think about it, my
3kva figure was probably conservative.
I hadn't thought of the scrap yard. That would probably be a lot
ch
Jon Elson wrote:
> Mark Pictor wrote:
>> 6.67kva 120v primary, 120v secondary
> What the HE** do you need a 6.67 KVA transformer for?
Mark already said that the transformers are at least twice as
big has he really needs.
But they are free (other than shipping), so he's asking us what
"gotchas" t
Mark Pictor wrote:
> 6.67kva 120v primary, 120v secondary
> I'd prefer 240v primary, but the nice thing about this one is that
> it's cheap (aside from the shipping). I don't yet have the weight,
> I am guessing from the weight of similarly-rated transformers.
What the HE** do you need a 6.67 KVA
Mark Pictor wrote:
> 6.67kva 120v primary, 120v secondary
> I'd prefer 240v primary, but the nice thing about this one is that
> it's cheap (aside from the shipping). I don't yet have the weight,
> I am guessing from the weight of similarly-rated transformers.
6.67kVA at 120V is 55 amps. The inr
With the price of copper these days... I assume from shipping that this is
copper and probably potted.
Is this intended for isolation or what?
Rayh
On Wed, 17 Oct 2007 01:00:28 -0700 (PDT), "Enhanced Machine Controller (EMC)"
said:
>6.67kva 120v primary, 120v secondary
>I'd prefer 240v p
6.67kva 120v primary, 120v secondary
I'd prefer 240v primary, but the nice thing about this one is that
it's cheap (aside from the shipping). I don't yet have the weight,
I am guessing from the weight of similarly-rated transformers.
He's got three, and he said they are free for pickup - but
Cali
Mark Pictor wrote:
> What are the drawbacks of an oversized transformer? Bulky, not as
> efficient, ???
>
> The one I am looking at is a little over 2 times the size I
> guesstimated that I need. At $100+ for shipping, I'm not sure if
> it's worth it or not. It would allow future expansion, but
What are the drawbacks of an oversized transformer? Bulky, not as
efficient, ???
The one I am looking at is a little over 2 times the size I
guesstimated that I need. At $100+ for shipping, I'm not sure if
it's worth it or not. It would allow future expansion, but would
probably still be overki
16 matches
Mail list logo
