Re: 220V 3 phase => 60 HP, how many amps?

That's the way our building is wired. The 208 line is called the "stinger." Ignoring the neutral, it's a delta with 240 line-to-line.

Is the motor 440 l-l delta?

Hey, I spent most of the day pulling wires inside crawl spaces and trying to to figure out what's connected to what. Why is it that buildings don't come with schematics?

John

I assume you mean "33KVA", right?

Thanks, Rich

I assume you mean "33kVA", right? :-)

If you want to do this per code, look for a nameplate value on the equipment. The M-G set will introduce some inefficiency into the system, making the direct conversion from mechanical HP to KVA somewhat less then accurate.

The quick answer is: You can't do this off a 100A panel. NEC Table

430.250 gives a full load current for a 60 HP 230V motor of 154A. As your situation is quite a bit more complex than this, I wouldn't even try to venture a guess as to what parts to buy to power this gizmo up. Heck, I don't even know where you are and what code is applicable.

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A common arrangement. For the purpose of calculating motor loads, you have a 240V 3 phase system.

You may also want to look around for nameplates and/or connection diagrams. Its possible that the M-G set might be dual voltage and be configurable for a 240V supply.

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Late at night, by candle light, John Larkin penned this immortal opus:

They do, sort of, for the benefit of the installers during construction. They invariably vanish after a very short while.

- YD.

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Actually, they did, before any construction. Of course, as built is nothing like the schematic... ;-)

I have seen as-builts being produced. Never seen the final product though!

Charlie

Yes, sorry, I left off the A. that's a bare bone minimum . that size will get hot and should be well vented. A better choice would be 50kva+

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Yes, that I did, but the 33kVA is border line. doubling it is always my choice:)

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Rich Grise snipped-for-privacy@example.net posted to sci.electronics.design:

Quick and dirty with nice derating, size the transformer 1 kVA per HP. Thus 60 HP => 60 kVA. That is how big a transformer to buy. At 220V that is about 60000/(220 * 1.732) = 157 Amperes each phase, thus he needs a bigger panel as well.

Jamie jamie_ka1lpa_not_valid_after_ka1lpa snipped-for-privacy@charter.net posted to sci.electronics.design:

Yes, and the most common (and probably least expensive) transformer size with nice margin is 75 kVA.

yeah, we have a lot of dry 75kva we salvaged from old equipment.

some times when we want to buy pizza for the shop, we grab one of those and salvage the copper to pay for the pizza party! :)

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Jamie jamie_ka1lpa_not_valid_after_ka1lpa snipped-for-privacy@charter.net posted to sci.electronics.design:

Sounds like you may have a customer for one if it has the rest of the appropriate ratings.

OK, lessee - is that Jamie or Joseph that has the transformer?

Does it meet the other specs, i.e., 240 delta in, 480 delta/wye selectable out? (I don't know if the MG takes delta or wye.)

Where are you? We're in Whittier, CA 90606 - what would shipping be?

If it is available, and meets the spec, and is shippable for less than an arm and a leg, shoot me a quote. My spamdump email is richardgrise#yahoo/com - remove the a,r,and d to get my informal name, and do the other obvious changes.

Let me know if you email, so if it doesn't show up, I can check my "bulk" folder. :-)

Thanks! Rich

I 'm sure we have a couple that fit those criteria's how ever, my company would have a hard time in the accounting department figuring out how to process that sale, since we're in the business of selling wire & cable, not xformers. We use these as replacements or upgrades for machines in house or if one of our other facilities need one. Other wise, they end up in the scrap metal bin when there is no use for them. Its a shame but that's the way it is.

Off the record how ever, I've seen equipment mysteriously disappear :)

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Lots of companies now sell things on eBay, I just won a used Tektronix item, and was surprised to learn I'd bought it directly from Tektronix. So ask you company if you can establish an eBay account sell it for them.

actually, one of my bosses has an EBay account and we do buy from Ebay when looking for something old or odd to replace in the facility. I'll ask tomorrow.

Lets see, 75kva 3 phase for step up. 220 to 440.

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Thanks. :-)

Presumably, he's already found one - yesterday, they brought in the machine and the MG. They brought the machine in with a forklift about the size of a garage. The MG is only about the size of a stack of 2 desks. :-)

Cheers! Rich

I really think it would of been more cost effective to simply change the motor to a lower voltage and use a drive from the 220 AC .. oh well. Obviously water over the damn now.

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