silly transformer question

[electricalperson]

if i have a 480 volt delta to 120/208 3 phase wye transformer. normally it gets 480 to the H terminals. what would happen if someone would to hook it up to the X terminals instead? would you get 240 volt delta?

 

[jim dungar]

if i have a 480 volt delta to 120/208 3 phase wye transformer. normally it gets 480 to the H terminals. what would happen if someone would to hook it up to the X terminals instead? would you get 240 volt delta?

Your question is not clear, to me, as to what is being connected to the X terminals.

 

[electricalperson]

Your question is not clear, to me, as to what is being connected to the X terminals.

the 480 volt feed from the panel. im not doing this in real life just a question that popped in my head

the 480 volt would hit the X terminals instead of going to the H

 

[winnie]

If you connected 480V to the X terminals of the transformer, then the transformer would _try_ to produce about 1100V at the H terminals. However what would really happen is that the transformer core would saturate big time and you would get lots of magnetizing current flow, and things would burn up pretty quickly.

-Jon

 

[electricalperson]

If you connected 480V to the X terminals of the transformer, then the transformer would _try_ to produce about 1100V at the H terminals. However what would really happen is that the transformer core would saturate big time and you would get lots of magnetizing current flow, and things would burn up pretty quickly.

-Jon

thank you it was just a question that popped in my head and i tried to think of an answer. appreciate your help

 

[electricalperson]

i take it the same thing would happen if someone was to feed 120 volts to the 16 volt side of a door bell transformer?

 

[quogueelectric]

Lots of smoke would occur I have accidentally reversed the leads on a small control transformer and lots of smoke there too.

 

[drbond24]

if i have a 480 volt delta to 120/208 3 phase wye transformer. normally it gets 480 to the H terminals. what would happen if someone would to hook it up to the X terminals instead? would you get 240 volt delta?

You would then be using the transformer as a step-up instead of a step-down. As a step-up, it has a winding ratio of 480/208=2.31 (I don't want to hear anything from you significant digits guys ). That means that anything you put on the low side will get multiplied by 2.31 on the high side. 480*2.31=1109 V.

 

[augie47]

You would then be using the transformer as a step-up instead of a step-down. As a step-up, it has a winding ratio of 480/208=2.31 (I don't want to hear anything from you significant digits guys ). That means that anything you put on the low side will get multiplied by 2.31 on the high side. 480*2.31=1109 V.

briefly

 

[drbond24]

briefly

Agreed. :wink:

 

[Smart $]

You would then be using the transformer as a step-up instead of a step-down. As a step-up, it has a winding ratio of 480/208=2.31

Actually, that's the line-to-line voltage ratio. The winding ratio is 480:120 or 4:1.