I have seen cases where the unbalanced L-G fault current was greater than the 3-phase balanced bolted fault current at a particular location. What are the system paramaters that would cause the L-G fault current to be higher than the 3 phase fault current?
I've been told that this typically happens close to a transformer where the zero sequence impedane is low however as you move further from the transformer the pos and neg impedances become much greater than the zero sequence and therfore reduce the level of the L-G fault current?
Can anyone explain a cause for the L-G fault being higher?
I've been told that this typically happens close to a transformer where the zero sequence impedane is low however as you move further from the transformer the pos and neg impedances become much greater than the zero sequence and therfore reduce the level of the L-G fault current?
Can anyone explain a cause for the L-G fault being higher?