Transmission Line Analysis Software

The ETAP Transmission Line module calculates electrical parameters, conductor ampacity-temperature relationship, and sag/tension-temperature relationship of overhead transmission lines. Comprehensive modeling of the coupling effect between different line branches is available. The user-friendly graphical interface displays the layout of circuits and ground wires for overhead lines. It is an easy-use tool for efficiently sizing lines, building new lines, and verifying the parameters of existing lines.

• Conductor & ground wire libraries
• Built-in configurations: horizontal, vertical, etc.
• General configuration: X, Y, & Z coordinate
• Multi-line mutual coupling
• Phase & sequence impedance matrix
• Transposed & un-transposed lines
• Short & long line models
• Multiple layer soil model
• Calculated or user-defined impedances

• Conductor ampacity vs. temperature
• IEEE 738-1993 Standard
• Determine maximum operating temperature for various loading conditions
• Calculate derated ampacity based on temperature limit
• Consider weather, solar heat, & geographical location

• Sag / tension vs. temperature
• Multiple spans between dead-end structures
• Level spans of unequal length
• Solve spans of unequal length on different horizontal planes
• Include effects of wind, temperature, & k factor

• Graphical user interface
• User-friendly input & output
• Flexible data entry for physical or impedance parameters
• One or more single-, two- or three-phase circuits, both transposed & untransposed
• One or more ground wires, both segmented & unsegmented
• Selectable typical line layout types
• User-defined general line layout
• Multiple layers of earth models
• Modeling of coupling effect between different line branches
• Tower ground resistance
• Use-definable conductor and ground wire libraries

• Automatic impedance calculation based on physical parameters
• Sag, tension, temperature, & ampacity calculations
• Sag / tension vs. temperature analysis
• Sag / tension analysis for same or different tower height
• Conductor ampacity vs. temperature analysis
• Optional phase/sequence domain parameter display
• Integrated tool to size lines or create new designs
• Physical parameter to impedance calculator
• Integrated with all system studies

• Series branch impedance matrices in the phase domain
• Series branch impedance matrices in the sequence domain
• Shunt branch susceptance matrices in the phase domain
• Shunt branch susceptance matrices in the sequence domain
• Sag / tension vs. temperature relationship
• Conductor ampacity vs. temperature relationship