To simulate a load event, you have to use the EvtLod. The load event works as follows:
1. Incremental change: Certain percentage of current value, P = P + P*dP/100 (same for Q)
2. Absolute change: Absolute percentage of nominal value, P = Pnom*dP/100 (same for Q)
3. Nominal value: Internally used for reliability calculation (load growth), absolute change of nominal value

In the attached example, two study cases are predefined: in the first one, a ramp change in the load is simulated, while in the second, a step change is applied.

The application of a ramp event needs to be allowed in the load element (ElmLod), Simulation RMS tab; otherwise, it will be ignored, and a step change will be applied.