# Search:

Type: Posts; User: Besoeker

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1. ## Thread: 45 KVA transformer max amperage?

by Besoeker
Replies
23\$\$
Views
456

### Regardless of where posted, the point remains.

Regardless of where posted, the point remains.
2. ## Thread: 45 KVA transformer max amperage?

by Besoeker
Replies
23\$\$
Views
456

### Which contradicts this from post #3: ...

Which contradicts this from post #3:

That's the point I was getting at.
3. ## Thread: 480 volt to 400 volt transformer

by Besoeker
Replies
27\$\$
Views
441

### Have you had that in writing?

Have you had that in writing?
4. ## Thread: 90 amp altenator

by Besoeker
Replies
15\$\$
Views
310

### With respect, that's an irrelevance. The...

With respect, that's an irrelevance.
The conductor size has to carry the current regardless of the voltage.
90A is 90A

If the op is correct with his guess that is #14 AWG, then 90A would be...
5. ## Thread: 480 volt to 400 volt transformer

by Besoeker
Replies
27\$\$
Views
441

### What disadvantages would a a buck a poorer option...

What disadvantages would a a buck a poorer option than a double wound?
6. ## Thread: 480 volt to 400 volt transformer

by Besoeker
Replies
27\$\$
Views
441

### You need to make sure you have that in writing.

You need to make sure you have that in writing.
7. ## Thread: 45 KVA transformer max amperage?

by Besoeker
Replies
23\$\$
Views
456

### You are correct of course......my apologies... ...

You are correct of course......my apologies...

So what if all the load is 125A, 120V single-phase and all it on the same phase to neutral?
An unlikely scenario I agree, but it demonstrates that...
8. ## Thread: 45 KVA transformer max amperage?

by Besoeker
Replies
23\$\$
Views
456

### The error is about 0.15V or 0.074%. ...

The error is about 0.15V or 0.074%.

Insignificant for this application I would suggest.
9. ## Thread: 45 KVA transformer max amperage?

by Besoeker
Replies
23\$\$
Views
456

### What if all the load is 125A, 120V single-phase...

What if all the load is 125A, 120V single-phase and all it on the same phase to neutral?
An unlikely scenario I agree, but is demonstrates that total kVA only what matters.
10. ## Thread: 3 phase inverter

by Besoeker
Replies
7\$\$
Views
226

### Oops - should have looked at the forum in which...

Oops - should have looked at the forum in which is was posted......
11. ## Thread: 3 phase inverter

by Besoeker
Replies
7\$\$
Views
226

### Per the OP "output continuous current." Assuming...

Per the OP "output continuous current."
Assuming a 3-phase input, the input current will be a bit lower.
12. ## Thread: Local Start/Stop for VFD driven Motor

by Besoeker
Replies
24\$\$
Views
506

### The early break aux contacts ought to prevent...

The early break aux contacts ought to prevent that.
But the usual specification imposed on us is fault make load break.
It's customer driven.
13. ## Thread: Reverse fed step down transformer

by Besoeker
Replies
32\$\$
Views
854

### Each transformer?

Each transformer?
14. ## Thread: Reverse fed step down transformer

by Besoeker
Replies
32\$\$
Views
854

### Exactly why/how would it do that?

Exactly why/how would it do that?
15. ## Thread: Reverse fed step down transformer

by Besoeker
Replies
32\$\$
Views
854

### Why, how would not connecting the neutral fix...

Why, how would not connecting the neutral fix that?
What if the WYE input was perfectly balanced and the delta output load was extremely unbalanced - where would that put the unconnected input star...
16. ## Thread: Reverse fed step down transformer

by Besoeker
Replies
32\$\$
Views
854

### Not at all. Where would you get an extremely...

Not at all.
Where would you get an extremely unbalanced wye input?
17. ## Thread: three phase transformer

by Besoeker
Replies
8\$\$
Views
276

### Transformer manufacturers can make any...

Transformer manufacturers can make any configuration you heart could possibly desire.
18. ## Thread: Reverse fed step down transformer

by Besoeker
Replies
32\$\$
Views
854

### On the wrong direction of the wind or a bad case...

On the wrong direction of the wind or a bad case of flatulence or whatever.
I still don't see why connecting the neutral to the star point is a bad thing.
19. ## Thread: Reverse fed step down transformer

by Besoeker
Replies
32\$\$
Views
854

### Surely we should be looking at line to neutral...

Surely we should be looking at line to neutral voltages.
20. ## Thread: Reverse fed step down transformer

by Besoeker
Replies
32\$\$
Views
854

### Still make no sense to me. Perhaps I framed my...

Still make no sense to me.
Perhaps I framed my question badly.
A floating neutral on the input wye side would allow the phase voltages to go unbalanced.
So, to make the question simpler, what is...
21. ## Thread: Reverse fed step down transformer

by Besoeker
Replies
32\$\$
Views
854

### I've seen that here before but don't see why you...

I've seen that here before but don't see why you shouldn't.
Surely a floating neutral on a wye winding would allow the phases to go unbalanced?

by Besoeker
Replies
9\$\$
Views
337

### The output current is usually a pretty good sine...

The output current is usually a pretty good sine wave.
The voltage is sine wave weighted pulse width modulated and the inductance of the motor results in the current being sinusoidal. More or less....
23. ## Thread: internal power factor

by Besoeker
Replies
11\$\$
Views
517

### I have actual test data on a 400kVA unit. It's a...

I have actual test data on a 400kVA unit.
It's a Ddyn11.

No load power factor is sort of comparable with yours at 0.16.
But, in real world terms, something of an irrelevance given that no load...

by Besoeker
Replies
9\$\$
Views
337

### Power factor.

Power factor.

by Besoeker
Replies
55\$\$
Views
4,083

### My two pence worth: 11357 A 350kW AFE...

My two pence worth:

11357

A 350kW AFE inverter.
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