Simulator 16 User Guide - PowerWorld

Splitting Buses
Simulator assists you in transforming one bus into two connected buses. This process is called splitting
a bus. In performing the split, the user is able to decide which equipment to keep connected to the
original bus and which equipment to move to the new bus. Because this activity impacts the structure
of the power flow equations, bus splitting can be performed only in Edit Mode.
To split a bus from the oneline diagram, right click on the bus you wish to split, and click Split Bus
from the resulting local menu. To split a bus from the Bus Case Information Display, right-click on its
corresponding record and again click Split Bus from the resulting local menu. In either case, the Split
Bus Dialog will appear.
Multi-section lines merit special consideration during bus split operations. These are the rules
Simulator follows when you try to split a bus that is part of a multi-section line. If the original bus is
the endpoint bus of a multi-section line and the ending line segment was transferred to the new bus,
then the new bus becomes the new ending terminal of the multi-section line. If the original bus was a
dummy bus of the multi-section line, and if exactly one of the branches connected to the original bus
is rerouted to the new bus, then both the new bus and the original bus will be dummy buses in the
reconstituted multi-section line. If neither or both of the lines connected to the original dummy bus
were rerouted to the new bus, then the multi-section line definition is eliminated, since Simulator has
no way to determine how the multi-section line should be redefined.
A final consideration involving bus splits is how sequence data is treated. If you have defined sequence
data for fault analysis, Simulator will recalculate the sequence data for the original and new buses
after the split. In this case, the zero sequence impedance for the new branch that connects the
original and the new bus will be set to j0.0001.
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