Recent content by zelvica

To tell you the truth I don't have that information(these cables are rather old and the information about manufacturer is not documented). All I know is the type of cables. Is such a big difference between parameters of cables from different manufacturers that you are asking about that? Thanks...

Hello! Does any one know any web site where I could find cable parameters (sequence impedances) about these cables: -XHE 48,49 -IPO 13,14 I know the values depend on different factors such as ground resistance, how the cables are laid and how far apart they are but anyway I need at lest some...

Thanks a lot guys, you help me a lot although I have to admit that I am quite confused now. I downloaded the program NetDraw free and in the help file it is written that if we enter data about iron losses and no-load current the program calculates the in-rush current. There is no sign entering...

How do we calculate in-rush current of transformer at swithing-on based on iron losses and no-load current? Thanks, zelvica

TONYFLAIR: You should find some equivalent circuits of transformers - they depend very much on the connection type. For example if the transformer is connected in Dyn like in your problem the delta winding has infinite impedance (as BrokenHandle mentioned it short circuits the zero sequence...

Hello! Is there any good site about power transformer theory - especially about in-rush current! Thanks, zelvica

I need a software for calculation of short circuit currents in distribution network. Is there any program where I can besides the impedance voltage enter other data about transformer (no-load/load losses, no-load current). I need this to analyze how these parameters affect the results. Thanks...

Hello! I need to create a loop for some calculations in one iteration step in program NETOMAC. I am trying to do it with IF / ENDIF ststement but the program hangs up. Is creating a loop possible at all? Thank you, Gorazd

Hello! In our distribution company there is about 5000 10(20)/0.4 kV transformers. For the purpouses of new control center we have to enter (rather import) data about them. We already have a database for characteristical data (S, Uprim, Usec, uk). Many of these transformers are from the same...

Hi! Our company bought a new software for the purpose of calculation of load flow, state estimation short circuit calculation... For short circuit calculations we need to enter data about (besides impedance voltage uk and nominal power and voltage): - no-load current, - no-load loss and - load...