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

[topgone]

I'd like to see how a utility would size their transformer to feed that load

Good if the drive used is 12-pulse. Knowing that a 6-pulse drive will have a very high harmonics content. Remember that a 6-pulse drive with 2-3% line reactor will have to derate the supply transformer by approximately 85%. Loading the transformer more than 85% (which the OP did) gives no margin for extra load capacity.

 

[Sahib]

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.

Are you doing monopoly business over there?

 

[Besoeker]

Are you doing monopoly business over there?

By no means. That was not my point anyway.

 

[Sahib]

By no means. That was not my point anyway.

Or do you think whoever designed the transformer and put it into operation in OP case are incompetent?

 

[Besoeker]

Or do you think whoever designed the transformer and put it into operation in OP case are incompetent?

Not words I would use.
Have a nice day.

 

[Sahib]

Please put it in black and white. Prove your competence by demonstrating the appropriate transformer KVA for 1000hp motor for all of us to see. That is this thread all about.:thumbsup:

 

[jumper]

Please put it in black and white.

I will.
Please tone down your responses. They can come off as a bit too aggressive.
Thank you.

 

[Sahib]

I will.
Please tone down your responses.
Thank you.

Sure. I am just trying to be certain about one thing or other as a result of discussion in this thread.

 

[Besoeker]

Sure. I am just trying to be certain about one thing or other as a result of discussion in this thread.

See post #41.

 

[Sahib]

See post #41.

See post # 86.

 

[Besoeker]

Please put it in black and white. Prove your competence by demonstrating the appropriate transformer KVA for 1000hp motor for all of us to see. That is this thread all about.:thumbsup:

Would the number of my successful design, manufacture, install projects do that for you?
Paper mills, dockyards, steel mills, pumping stations, etc.
Blue chip paying customers........

I'm with jumper. The tone of your post comes across as not a lot more than a little irritating.
But that's OK I guess given idiomatic English may not be your forte.

I hope you have had a good day.

 

[Sahib]

Would the number of my successful design, manufacture, install projects do that for you?
Paper mills, dockyards, steel mills, pumping stations, etc.
Blue chip paying customers........

I'm with jumper. The tone of your post comes across as not a lot more than a little irritating.
But that's OK I guess given idiomatic English may not be your forte.

I hope you have had a good day.

If you want to extend the thread in that way without giving any definitive answer, the thread will be very boring indeed.

 

[Besoeker]

If you want to extend the thread in that way without giving any definitive answer, the thread will be very boring indeed.

OK - 1MVA.

 

[Sahib]

OK - 1MVA.

Excellent.:thumbsup:. Now please outline your calculation of transformer size 1MVA for 1000hp motor if you have any.:lol:

 

[Besoeker]

Excellent.:thumbsup:. Now please outline your calculation of transformer size 1MVA for 1000hp motor if you have any.:lol:

My 20% rule. What is yours?

 

[Sahib]

My 20% rule.

Your 20% rule is not clear. Please shed some more light.

 

[Besoeker]

Your 20% rule is not clear. Please shed some more light.

I don't need any more.
Line in the sand - OK?

 

[jumper]

My 20% rule.

I am curious so I will ask.

The NEC has us add 25% for loads that could run continuously for 3 hours or more, basically a fudge/CYA/plan for the worst factor.

is this pretty much what you are doing also?

 

[jumper]

My 20% rule.

I am curious so I will ask.

The NEC has us add 25% for loads that could run continuously for 3 hours or more, basically a fudge/CYA/plan for the worst factor.

is this pretty much what you are doing also?

 

[Besoeker]

I am curious so I will ask.

The NEC has us add 25% for loads that could run continuously for 3 hours or more, basically a fudge/CYA/plan for the worst factor.

is this pretty much what you are doing also?

Much simpler. It is usually the least cost power component to figure in extra capacity for non linear loads or goof ups.