50Hz Transformer run on 60Hz system

[tricard]

Good afternoon all,

I am modeling a system that appears to have 50Hz equipment running on a 60Hz system.

I am particularly interested in knowing the affects of this difference in frequency on nameplate ratings on transformers. I can guess that the %Z would be 120% of the listed %Z due to the frequency increase, but I feel there are other considerations that I am overlooking. Are there any notable references (or threads in this forum -- I was unable to find what I was looking for) on this subject?

Thank you for the help,

Tim

 

[itsmoked]

Check this as there is little different between transformers and motors in the frequency change realm.

faq237-1224

Keith Cress
kcress -

http://www.flaminsystems.com

 

[waross]

Re %impedance. The impedance is the vector sum of the resistance and the reactive inductance. resistance is not frequency dependent, inductive reactance is frequency dependent. The X/R ratio will change.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[tricard]

I read the motor FAQ and bookmarked it (great article!)

One question from that FAQ: it states that cooling is reduced when a 60Hz motor is ran at 50Hz. What is physically occurring that would cause the cooling to be poorer when run at 50Hz... is it due to the higher V/f ratio?

Thanks for the help,

Tim

 

[dpc]

The motor is running at 5/6 normal speed, so the shaft mounted cooling fans are not providing normal air flow.