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Hello,
After running through several simulations, my question would be following:
For a three phase fault the influence of the load on the short circuit was the same independent of the used technology (e.g. star or delta) - the fault current was reduced the less the load impedance was. I guess the positive sequence system was the same for both systems.
However, for a single phase fault the load technology seems to have an influence: For delta-connection the fault current was reduced with decreasing load impedance. For star-connection the fault curerent increased with decreasing load impedance.
As far as I know, the only difference in between delta and star-connected loads is the zero system impedance (delta-loads don't have one ?). As a result, the absolute value should be different depending on which load is used. But, there should not be a difference in behavior when the load impedance is reduced.
I am sorry for my bad english - it is not my native language.
I hope there is someone who can explain this different behavior.
Thanks in advance.
After running through several simulations, my question would be following:
For a three phase fault the influence of the load on the short circuit was the same independent of the used technology (e.g. star or delta) - the fault current was reduced the less the load impedance was. I guess the positive sequence system was the same for both systems.
However, for a single phase fault the load technology seems to have an influence: For delta-connection the fault current was reduced with decreasing load impedance. For star-connection the fault curerent increased with decreasing load impedance.
As far as I know, the only difference in between delta and star-connected loads is the zero system impedance (delta-loads don't have one ?). As a result, the absolute value should be different depending on which load is used. But, there should not be a difference in behavior when the load impedance is reduced.
I am sorry for my bad english - it is not my native language.
I hope there is someone who can explain this different behavior.
Thanks in advance.
