When a new circuit is instantiated, it is created as a 3-phase voltage source named "Source" connected to a bus named "SourceBus" with a reasonable short circuit strength for transmission systems feeding distribution substations.


Figure 1. Default Circuit


The default values for the source are (see Vsource object definition):


•115 kV


•3000 MVA short circuit


Thus, the circuit can be immediately solved, albeit with a trivial result.

The circuit is also immediately available for adding a substation and/or lines for a quick manual circuit modeling task.


The default circuit model does not include a substation transformer because the user may wish to study more than one substation connected by a non-trivial transmission or sub-transmission network.