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I want to apply bus fault in my dynamic simulation.

When I select [Bus Fault] option,I have to input [R,X] of "Admittance", the default parameter is:

|     R      |      X     |
|     0      |  -2e+009   |

My understanding is that the bus fault defaults to a three-phase short circuit fault by default. If it is not specified as a ground fault, then there is no impedance parameter to be input, because the simple short circuit fault impedance is 0.

But when I set [R,X] to [0,0], I found no change in the angle curve of my dynamic simulation result

So what does this "Admittance" mean?