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Why Dynamic Simulation doesn't Initialize?

Hi Guys

I find a funny thing:

  1. I do the dynamic simulation, apply bus disturbance. The result show me, bus 2 voltage is 0.719 pu.

  2. After first simulation, I do another simulation, with same dyr & sav file, I choose a different Channel output file and Initialize it. Without apply any bus distrubance, the bus 2 voltage is still 0.719pu...?

It is normal for PSSE? How to avoid this issue? Thank you very much.