Dear all, I'm trying to convert a database containing a part of my country's power system (110, 220 and 400 kV lines). The problem is that I've received the database from an Eurostag *.out file and this is giving me headaches. The reason for this is that I told the people who gave me the data to give me the R, X and B parameters for the branches, which they did (I have these parameters in p.u.). This may seem ok, but I now have doubts that the values were transformed in p.u. using the correct base, especially for transformers. Hence, I come with the following questions: when computing the R, X and B parameters for branches what base do you have to use? Is the MVAbase and V2 (voltage at the "to" bus of the branch)? And, is this base also used for transformers or just for lines? And last, if no information regarding the ratio for transformers, how can I compute this value? Would it be ok to write it as (rated V "from" bus)/(rated V "to" bus)? Note that the transformers are not phase-shifting ones.
Thank you for your answers! Petre
