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Snapshot
The snapshot feature is available through the HYPERSIM ribbon, in the simulation subset. It is only available during the simulation.
The goal of this feature is to save the state of the simulation at any given point in time in order to be able to force it onto the running simulation later on.
Snapshot is an image of the simulation at a specific simulation step. It saves the voltage and current value at all nodes as well as historical values for components requiring them such as lines and UCM.
It's often used to force steady-state conditions after events have destabilized the systems, or to study transient behavior more complicated or requiring longer to reproduce, such as the starting sequence of a machine. It is thus very practical to facilitate manual testing and essential to automate testing.
As an example, we'll use the HYPERSIM example model Transmission & Distribution/HVAC_735k_38Bus, as it requires a bit of time to stabilize at the beginning of the simulation.
Running real-time simulation also makes it easier to demonstrate the behavior of the snapshot, as with non-real-time simulation the acquisition is generally too fast to have the time to apply the snapshot during the acquisition.