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A good procedure to create a snapshot is:

1. Open saved case
2. Open dynamic raw data file (.dyr)
3. Change dynamic options and solution parameters (if needed)
4. Add channels
5. Save snapshot file (.snp)

A good procedure to perform a dynamic simulation is:

1. Open saved case

2. Open snapshot

3. Convert load and generators

4. Initialise simulation and define the name of the output file

5. Simulate the disturbance with a combination of commands (RUN, Bus fault, Clear fault, trip line, etc.). A predefined script is recommended for this.