volkanksr
Electrical
- Aug 22, 2006
- 9
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 transformer i calculate aprox.1500 A.
My questions:
1. Why i dont have earth fault current if i connect ZNyn1
2. What is the difference of both Zigzag grounding and ZNyn1 transformer.
3. I have to calculate earth fault value at 6.6 kV when ZNyn1 earthing transformer is connected to system.Can somebody help me?
Best regards,
Volkan KES?R
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 transformer i calculate aprox.1500 A.
My questions:
1. Why i dont have earth fault current if i connect ZNyn1
2. What is the difference of both Zigzag grounding and ZNyn1 transformer.
3. I have to calculate earth fault value at 6.6 kV when ZNyn1 earthing transformer is connected to system.Can somebody help me?
Best regards,
Volkan KES?R