The only way I will be sure is to test it. The label from Toroid Corp. of Maryland states exactly what I typed, however. This is definitely a custom job and I suppose it's possible the label is typo'd. I understand they were for some type of military radar assy.
There is another one like it where I got this, as well as a 2 X 2000va at the same voltages.
There is another one like it where I got this, as well as a 2 X 2000va at the same voltages.
the primaries make sense...
...For an international piece of equipment...
With the correct parallel/series combination of the 100,100,20,20 you can fulfill just about any nations voltage requirement (100, 120, 200, 220, 240).
Does this weigh like 25lbs? it's possible it really is a 2x2500va xformer, the thickness of the copper visible through the tapes suggest it has huge current rating, you could do a little surgery and center tap the 120v secondaries and get 60+60, 60+60 at some 20amps if it is a 5kw transformer...or just use it as 120+120 for a mighty powerful amp.
Looks like a pretty darn cool find...if a little large for some applications...
Stuart
...For an international piece of equipment...
With the correct parallel/series combination of the 100,100,20,20 you can fulfill just about any nations voltage requirement (100, 120, 200, 220, 240).
Does this weigh like 25lbs? it's possible it really is a 2x2500va xformer, the thickness of the copper visible through the tapes suggest it has huge current rating, you could do a little surgery and center tap the 120v secondaries and get 60+60, 60+60 at some 20amps if it is a 5kw transformer...or just use it as 120+120 for a mighty powerful amp.
Looks like a pretty darn cool find...if a little large for some applications...
Stuart
Hi,
Stuart is spot on
Four 60Vac windings would be handy. Pity about the filled centre though.
You should still be able to test probe for the centre tap and make good any enamel damage before re-wrapping the outer insulation and all this without removing the core.
Would it be a waste to use as an isolating transformer 120 to 120 at a total of 5kVA?
Stuart is spot on
any nations voltage requirement (100, 120, 200, 220, 240)
Four 60Vac windings would be handy. Pity about the filled centre though.
You should still be able to test probe for the centre tap and make good any enamel damage before re-wrapping the outer insulation and all this without removing the core.
Would it be a waste to use as an isolating transformer 120 to 120 at a total of 5kVA?
unpotting...
...the centre is possible...
I bought a set of toroidal transformers from parts express last year, I wanted to rewind them and had the potted centre issue. After slitting the tape around the circumference of the transformer, you can use a piece of broom handle and a hammer to drive it from the centre of the transformer. The insulating tape has a low enough coefficient of friction it simply pops out...
Of course you need more tape to rewrap the thing after you rewind it...
Good luck
Stuart
...the centre is possible...
I bought a set of toroidal transformers from parts express last year, I wanted to rewind them and had the potted centre issue. After slitting the tape around the circumference of the transformer, you can use a piece of broom handle and a hammer to drive it from the centre of the transformer. The insulating tape has a low enough coefficient of friction it simply pops out...
Of course you need more tape to rewrap the thing after you rewind it...
Good luck
Stuart
Stuart is spot on
Sure is.
I tested the beast last night. The primary flexibility is nice
IIRC I can get +- ~60v or ~72v or ~85v or ~103v or ~120v on the secondaries.
Stuart,
How did that 500w ksa50 work out? Ya think I might have a candidate?
EDIT: I have easily removed potted centers before by removing most of the potting towards the center with a forstner bit. This has allowed it to flex just enough to work the material out pretty easily.
actually...
...if you need an amp rated in horsepower, that is a pretty darn good transformer for the beast...
Actually haven't worked on the amp in a while. Slowly merging two households has made 'free' time a thing of the past...
I use a pair of 1.4kva toroids, hooking up the 100v primary tap with 120v mains to get the 120v rails I want, theoretically about 4hp available. In reality I've seen ~1kw RMS into 4ohm loads, at which point the voltage into the primaries is dropping noticeably, like down to 100v. Most recent change was to use a direct 240v spur to reduce the source impedance and primary current draw. However, my wife was not happy about the drier being offline... ;^) nor the 1" thick cable running across the garage...
If you were thinking about using this thing anywhere near its potential, you'd want to get a friendly electrician to put a 240v outlet in the room where you planned to plug it in. With a typical 120v outlet 'limited' to 15amps, you don't really get to use even 30% of its capacity. With a 240v primary you can reduce the I^2 losses considerably and equalize the 'pull' from the utility company, plus the wall plugs for 240v are much higher current capacity...
Of course there is still the issue of the inrush...for testing purposes my variac is perfect for powering up to 120v, but it's not 240v rated, and I suspect it would melt down if I were to use even the pair I have to their fullest...yours is twice the size again...
NP would be the best person to ask about powering up something that big, I think he has one that size in the X1000...
Stuart
...if you need an amp rated in horsepower, that is a pretty darn good transformer for the beast...
Actually haven't worked on the amp in a while. Slowly merging two households has made 'free' time a thing of the past...
I use a pair of 1.4kva toroids, hooking up the 100v primary tap with 120v mains to get the 120v rails I want, theoretically about 4hp available. In reality I've seen ~1kw RMS into 4ohm loads, at which point the voltage into the primaries is dropping noticeably, like down to 100v. Most recent change was to use a direct 240v spur to reduce the source impedance and primary current draw. However, my wife was not happy about the drier being offline... ;^) nor the 1" thick cable running across the garage...
If you were thinking about using this thing anywhere near its potential, you'd want to get a friendly electrician to put a 240v outlet in the room where you planned to plug it in. With a typical 120v outlet 'limited' to 15amps, you don't really get to use even 30% of its capacity. With a 240v primary you can reduce the I^2 losses considerably and equalize the 'pull' from the utility company, plus the wall plugs for 240v are much higher current capacity...
Of course there is still the issue of the inrush...for testing purposes my variac is perfect for powering up to 120v, but it's not 240v rated, and I suspect it would melt down if I were to use even the pair I have to their fullest...yours is twice the size again...
NP would be the best person to ask about powering up something that big, I think he has one that size in the X1000...
Stuart
www.passlabs.com/np/MPA_PS_D0.pdf
BTW: i made a surgical centertap on isolation transformers to turn them into balanced isolation transformers(Peter-Daniel stuff), works great. 5000VA should make quite an isolation transformer setup.
BTW: i made a surgical centertap on isolation transformers to turn them into balanced isolation transformers(Peter-Daniel stuff), works great. 5000VA should make quite an isolation transformer setup.
BWRX said:It could be one helluva paper weight
Or you could make your own electric chair
OK now I have 3 paperweights
a 5kva for a isolation traffo
a 4kva (all other things equal just smaller) for a preamp ..um amp.
a 5kva to um........hum........
mpmarino said:
OK now I have 3 paperweights
a 5kva for a isolation traffo
a 4kva (all other things equal just smaller) for a preamp ..um amp.
a 5kva to um........hum........
ya don't have enough paper;
send at least one to me,I have more paper than ya !
infinia said:As a last resort you could get scrap for the Cu at $4/lb. So you prob have 1/3 weight of copper at 79lbs. Comes to about $100 ea. Hahaha
I was thinking the same thing, which is why I was happy to grab 'em at $20 us each. It's a win-win.
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