you're wrong. no you're stupid. well you're stupider so there.

[Besoeker]

One sue sign the transformer is not big enough is it won't allow the motor to run by dropping out contactors due to excessive voltage drop on starting. But OP has not reported any such happening. So reductio ad absurdum, the transformer is big enough.

An 875kVA transformer isn't big enough for a 1,000 hp motor. If you were in the business of designing drive systems you would have no difficulty in understanding that.
There is no ad absurdum about it.

[Ingenieur]

An 875kVA transformer isn't big enough for a 1,000 hp motor. If you were in the business of designing drive systems you would have no difficulty in understanding that.
There is no ad absurdum about it.

let's agree to disagree
imho it is sufficient
especially if the 840 was measured at the drive output, then motor load is only ~750 kva (90 kva for the filter/xfmr consumption) on a 875 kva xfmr
need more info from the op

[Besoeker]

let's agree to disagree
imho it is sufficient

If it was, it wouldn't run over temp.

[qcroanoke]

What is reality?

A concept

[Ingenieur]

If it was, it wouldn't run over temp.

it did not run over temp
he said that is what he expected to see ('usually') but did not, but rather the output was clamped at 840 which surprised him (and imo impossible)
that is why we need more info
but on the surface, if measured at the drive out, the most convenient point, the xfmr only operated at 750 or 85%

[electrofelon]

An 875kVA transformer isn't big enough for a 1,000 hp motor.

Wouldn't it depend on how much the motor was loaded? Perhaps the motor was oversized, or the calculated size was just over the next size down?

[Besoeker]

[QUOTE=Ingenieur;1872442]it did not run over temp]/QUOTE]
I don't see how else you can interpret "usually it just runs over temp."
Seems unambiguous to me.

[Besoeker]

Wouldn't it depend on how much the motor was loaded? Perhaps the motor was oversized, or the calculated size was just over the next size down?

Quite right. Possibly a number of things. But if the transformer got too hot that's one problem right there.

[topgone]

These things here got me confused. Why do other people here claim that the setup is okay when the OP mentioned "it failed"? Did I miss a lot?

[Fulthrotl]

An 875kVA transformer isn't big enough for a 1,000 hp motor. If you were in the business of designing drive systems you would have no difficulty in understanding that.
There is no ad absurdum about it.

1HP = 746 watts.
1,000 HP = 746,000 watts.

that's not allowing for any losses whatsoever.
no heat, transformer loss, zip.

125% would be 932,500 watts.