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This software package is a transmission and distribution line analyzer for rapid line parameter computations, steady-state and fault-induced electromagnetic interference studies (whether inductive or conductive) as well as an electric and magnetic field calculator.

Technical Description

The SESTLC Pro software package is a transmission and distribution line analyzer for rapid line parameter (constants), EMF and steady-state or fault induced electromagnetic interference estimates (whether inductive and conductive). It can be used to quickly estimate line parameters, electric fields, and magnetic fields associated with arbitrary configurations of transmission and distribution lines. It also estimates voltages and currents generated by electromagnetic interference on other neighboring metallic utilities, such as pipelines, railways and communications lines. The software has been designed with simplicity in mind, providing an abundance of useful information with minimal data entry, when applied to simple system configurations. This can be very helpful for preliminary analyses of more complex systems. An exposed line does not have to be parallel to the transmission line in a SESTLC Pro model, however a simplified data entry mode is available for cases where the exposed line is always parallel to the transmission line.

Keep in mind that for more complex systems or more detailed studies, the Right-of-Way or MultiFields software packages are recommended.

A summary of the estimations that can be made with SESTLC Pro:

  1. Line parameters of overhead transmission lines
  2. Electric & magnetic fields at given observation profiles
  3. Normal load (steady-state) condition inductive interference on a parallel or jagged exposed line
  4. Fault condition inductive and conductive interference on a parallel or jagged exposed line
  5. Inductive and conductive interference calculation between arbitrarily oriented transmission lines and buried jagged exposed lines in a homogenous earth.

User Interface

SESTLC Pro computes the line parameters of the transmission lines, the electric and magnetic field at selected observation points, the induced stress voltages and longitudinal currents on the exposed line during steady state conditions and fault conditions on the transmission lines.

The exposed circuit can be described as either as a simple “parallel” line or as a “jagged” linear path consisting of a conductor that follows an arbitrary 3D linear path.

In parallel line mode, the exposed circuit includes a central portion running parallel to the transmission line, continuation portions running perpendicular to the transmission line on both sides of the central portion and termination shunt impedances at both ends. Note that with this setup the continuation portions are not subject to EMF from the transmission line. The longitudinal direction of the transmission line is along the X axis. The coordinates of the exposed line are defined with respect to this coordinate system.

In jagged line mode, the path followed by the conductors consists of any number of sections. Each section can have its own geometrical and electrical characteristics. The configuration is determined by the coordinates of the path. A jagged exposed line starts from the left side and extends to the right side. See the following screen for more details.

Graphical Results

SESTLC Pro displays many computation results in a variety of plots using the Array Visualizer tool or SESPlot. The plots can be displayed immediately on your screen following completion of the computations, or can be saved on your hard drive to be displayed later. The images below show a 3D plot of the total electric field and total magnetic flux density produced by a transmission line near towers and the induced potential rise on a pipeline that is parallel to a transmission line (2D Plot).