3 phase 4 phase 200 amp transformer

[scottysolar]

never seen this before
doing service change existing motors are 4 phase feed from a 3 phase to 4 phase transformer

 

[LarryFine]

Funny you should ask. Do a forum search for "Scott-T transformers".

 

[scottysolar]

thanks for the info
very helpfull

 

[zog]

Funny you should ask. Do a forum search for "Scott-T transformers".

Did you just tell Scotty to search for Scott-T? Classic.

 

[LarryFine]

Did you just tell Scotty to search for Scott-T? Classic.

Yep, which is why I said:

Funny you should ask.

 

[iceworm]

What's "4 phase"?

W

 

[LEO2854]

What's "4 phase"?

W

Here is a good link for transformers.http://www.electricalpowertransformer.com/acme.html#2
I hope this helps ,I could not find 4 phase it might be there so take a look.

 

[LEO2854]

What's "4 phase"?

W

never seen this before
doing service change existing motors are 4 phase feed from a 3 phase to 4 phase transformer

This may be a mis print on your prints 3phase 4 wire 200 amps ?
and on your print 3 phase 4 phase 200 amps?

 

[LarryFine]

What's "4 phase"?

Picture two 120/240v 1ph secondaries that are offset in their timing by 90 degrees, and each of the two center taps, i.e., the neutrals, joined together, much like a wye supply.

Instead of three phases in a Y-shaped supply, with 120 degrees between adjacent hots, you'd have four 120v phases in an X-shaped supply, with 90 degrees between them.

Technically, it's really two phases, just sometimes called four, the same way a single 120/240v supply is one phase, but sometimes called two (from the neutral's perspective.)