00:36 Dec 22, 2011 

It wasn't clear until I got the last file and I noticed the XOF and the light went on in my head. In the first file the x was placed as you would place a multiplication sign. I could not find any term that started with an O or F in the document.

21:40 Dec 21, 2011 

2.500.000 XOF verkaufen (you sell) Sie erhalten 4.871,34 USD (you receive)
2.500.000 XOF kaufen (you buy) Sie zahlen (you pay) 5.068,32 USD

(Computed by Oanda) http://www.oanda.com/lang/de/currency/converter/

21:28 Dec 21, 2011 

it seems so obvious. That's context for you.

16:57 Dec 21, 2011 

It turns out the X was misplaced - it should be XOF, a currency sign for West African Francs...

10:22 Dec 21, 2011 

"not sure how to translate OF". Do you have some inkling you could share (at the risk of leading the witnesses), e.g. relevant words in your text starting with O and F, or do you mean "I don't know"?
The F could stand for fer, pertes à vide being aka pertes dans le fer.

10:19 Dec 21, 2011 

extrêmement rare pour exprimer les pertes à vide, qui sont mesurées en fréquence industrielle (50Hz) d'ailleurs. Il faut demander une explication au client.

10:16 Dec 21, 2011 

I looked into IEC 61378-2 http://wendang.baidu.com/view/09f65f7f27284b73f24250e4.html
but found no abbreviation "OF" related to losses. I have to guess: stands "O" for "open" or "ouverture" and "F" for "Frequency"? or is "F" an index?

Note: A.m. standard describes also tap changer (changeur de prise) and AC bushings (traversées c.a.)

06:21 Dec 21, 2011 

means 'no-load losses' — i.e. even if no-one draws any electricity from the system, there are still some losses, e.g. from reactance effects, leakage / creepage, etc.

01:07 Dec 21, 2011 

Not sure. The perte a vide presumably means losses due to radiation into space. OF - harder, F could be frequency.