Hello everybody,
I need to calculate %R+ resistance and %X+ reactance values of primary-secondary, primary-tertiary and secondary-tertiary windings. Transformer information :
120/60/60 MVA
154/11/11 kV
Uk: 16%/16%/16%
Po: 40 kW
Pk: 400 kW
Io: %0.25
Please send your calculation results...
We have 2*62.5 MVA Transformer, 2*12 MW Generator and lots of big motors and loads in our power plant. Transformers are YNd,generators are connected to D side and we are discussing about grounding of generators. Should we use hybrid, solid or high resistance ground for generators? Or should we...
Hello everybody,
What is the rule and limitations of chosing TR vector group. For example i will use a YNd transformer %6 Uk 33/0.4 kV but i don't know which vector group to choose. YND11 or 1 0r 5 ?
Thanking you in advance
Hello everybody,
I have 132/6.6 kV 40 MVA YNd11 main transformer and 250 kVA ZNyn1 Auxilary Earthing transformer connected to main transformer at 6.6 kV side. I'm trying to calculate the earth fault current values but i calculate only 3 amps.But when i use a zigzag grounding instead of ZNyn1...
