Transformer Info

[Dennis Alwon]

First off I want you to know I do not know anything about trany's.

I ran into this and don't understand it.

What is the current on the secondary side of a 75 KVA 3 phase 480:208/120 volt wye transformer?

What does the 480:208/120 mean?

 

[infinity]

What does the 480:208/120 mean?

I would think that it's the transformer voltage(s). 480 primary, 208Y/120 volt secondary.

75000/208/1.73=208.4 amps

 

[Volta]

First off I want you to know I do not know anything about trany's.

I ran into this and don't understand it.

What is the current on the secondary side of a 75 KVA 3 phase 480:208/120 volt wye transformer?

What does the 480:208/120 mean?

The secondary current is 208 amps (75000 va / 208 volts / 1.73 sq rt3 = 208 amps).

The ratio shows the primary voltage as 480, the secondary as 208 line to line, and 120 line to the midpoint of the wye secondary.

 

[iwire]

75*1000/208/1.73=208.425 rated secondary amps.

 

[Dennis Alwon]

Thank you-- I couldn't understand the colon. I was thinking it was a 480 or 208 tap on the primary and 120 on the secondary but obviously that was dumb thinking. That also explains why I got the wrong answer. :grin:

 

[cadpoint]

One of your signature statements serves you well! A colon expression of a ratio!

:grin:

http://mathworld.wolfram.com/Colon.html

 

[Dennis Alwon]

One of your signature statements serves you well! A colon expression of a ratio!

:grin:

http://mathworld.wolfram.com/Colon.html

Yeah I know what a colon is. Someone was here with me and somehow I just look at it in a bizarre way. Again I'll blame the drugs but to be honest I had never seen a trany written as a ratio. Obviously I am a bit inexperienced with tranys. Except for a few door bell transformers I believe I have hooked up less than 3 in my life and all of them were very small.:grin:

And Jude-- I am good at fractions....:grin: I am also good at sarcasm

 

[mivey]

First off I want you to know I do not know anything about trany's.

A transformer is used to transfer energy from one circuit to another. It can provide isolation between the systems and a change in voltage levels or both.





















:grin:

 

[LarryFine]

I couldn't understand the colon.

In this case, it replaces the word "to".

A 480 to 208Y/120 transformer.

 

[Dennis Alwon]

In this case, it replaces the word "to".

A 480 to 208Y/120 transformer.

Yes, I still cannot believe I didn't see that but hey- c'est la vie.

Thanks -- just when I think I have gotten real good at this code stuff I always get put in my place.:grin: