heberovchem
Electrical
- Oct 14, 2008
- 10
Could someone show me the calculations to arrive at the following percentages:
The available ground-fault current should be at least 25% (X0 = 10X1) and preferably 60% (X0 = 3X1) of the three-phase fault current to prevent serious transient overvoltages. Available is considerably higher than the level of fault current desirable in a resistance grounded system.
Thank you
The available ground-fault current should be at least 25% (X0 = 10X1) and preferably 60% (X0 = 3X1) of the three-phase fault current to prevent serious transient overvoltages. Available is considerably higher than the level of fault current desirable in a resistance grounded system.
Thank you