Use a Table Lookup Range rule to calculate an unspecified value using linear interpolation. In this example, the Table Range Lookup rule calculates the sag tension for an overhead line of a length not specified in the sag tension table.
Click Configuration tab Setup panel Table Editor and create a table similar to the following with your sag tension data.
Click Configuration tabSetup panelManage Rules.
In the Rule Configuration editor, click AnalysisSagEquationTension.
Click Create Rule.
Using the Table Lookup Range function, define a rule similar to the following: