Merge Line Terminals

 

A transmission line can be removed from a load flow case without losing the electrical connectivity of the line's two terminal buses by merging the line terminals into a single bus. The command to merge line terminals can be performed in two ways, and can only be invoked when Simulator is in Edit mode.

First, a MergeLineTerminals script command can be invoked in Script mode or from an auxiliary file. The only parameter of the script command is a filter parameter, which must be populated with either the name of an advanced filter (with the name in quotation marks) or with the text SELECTED (no quotation marks.) If an advanced filter is given, Simulator will find all transmission lines that meet the advanced filter definition, and will individually merge the line terminals of each line one at a time. Simulator will retain the From bus information as the new merged bus information for each line, with one exception. If a line was removed by merging its terminals that was the first or last segment of a multi-section line, the multi-section line terminal bus information will always be retained as the new merged bus.

The second way a line or lines can be chosen to have their line terminal buses merged is to select a set of lines in the branches table of the model explorer, and to then right-click in the table and bring up the popup menu. The option to Merge Terminals is located under the Branch Records submenu.