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Hello All, I have a task to run 3-phase fault on every line that is over 100 kV in the footprint of the Transmission Operator and determine if the generators near by the line will be stable or not.

My questions on this task are below: 1. Why is it necessary to run the analysis on every single line? Isn't it the case that generator is more severely impacted by the 3-phase fault on the lines exiting from Generator Step Up Transformer (GSU) than the fault on any other line that is far away from the generator in the network? In other words if the generator is stable for a 3-phase fault on the lines connected to GSU then can't we say that the generator will be stable for 3-phase fault on any other line farther away from the generator.

1. Will there be a case where the generator (assumingly a big generator) is stable for a 3-phase fault on the line next to it's GSU but a small generator which is electrically close to the big generator is not stable for the same fault?

   1. If the reasoning in #1 is correct then it will greatly reduce the channels (in other words number of buses and parameters that I need to monitor will be limited to just 3 buses around the generator) that I need to monitor and save and thereby reduces the time taken to perform transient stability analysis of the entire network.

   2. I understand that impedance of the network during the fault also plays key role in determining the stability of the generator and I believe that limiting the analysis just to the lines connecting to GSU is sufficient.

   3. Is there something else that might impact this approach or something that I'm missing in my analysis?

Thanks in advance.