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277V to 120V step down transformer

 
 
Reply Mon 8 Sep, 2014 08:55 pm
what would happen if I have 286V connected to a 277V to 120V step down transformer?
will it just increase the secondary voltage output proportionally?
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Type: Question • Score: 0 • Views: 856 • Replies: 4
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timur
 
  2  
Reply Tue 9 Sep, 2014 05:45 am
@joeyvtec,
It will do that but:

- You have to take into account that it also increases the amps flowing through the primary winding of your transformer. However, given that the difference in voltage is around 5%, it would have little consequence.

- The waste heat produced by losses will be higher too. Be careful if your transformer is already working full nominal power.
joeyvtec
 
  1  
Reply Tue 9 Sep, 2014 02:38 pm
@timur,
Thanks for awesome response. now I feel confident my solution will work.

But what do you mean by wasted heat produced by losses will be higher too?

I'm using LED downlight and will only be 1/2 to maximum load capacity of the stepdown transformer. Smile
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timur
 
  1  
Reply Tue 9 Sep, 2014 02:52 pm
The electrical efficiency of a transformer is usually around 95%.

The remaining is waste heat losses..

Your project should work.
joeyvtec
 
  1  
Reply Tue 9 Sep, 2014 03:19 pm
@timur,
Again, thank you very much for your great information and giving me so much confidence. Smile
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