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SESShield-3D is a software package dedicated to the analysis and design of shielding systems against lightning strikes in complex 3D environments.

Included Software Tools


Technical Description

SESShield-3D is a powerful software package for the analysis and design of lightning shielding protection systems in complex 3D environments, including substations, power plants, industrial plants and other such installations, accounting for the presence of power lines, equipment, and buildings. SESShield-3D allows arbitrary metallic structures to act as shielding systems, including not only shield wires and masts, but also other structures that attract lightning.

SESShield-3D offers a simple and intuitive graphical user interface that can be used to carry out a complete lightning shielding analysis for a system of freely positioned objects having various geometrical shapes, such as: catenaries, cylinders, cones, cubes and other prisms. Furthermore, calculations are extremely rapid and provide clear, interactive, 3D graphical feedback, so that a shielding system can be designed very quickly and efficiently.

Rendering of an Electric Substation

SESShield-3D Capabilities

SESShield-3D can analyze and design a lightning shielding system for the protection of vulnerable systems of arbitrary geometries. SESShield-3D can also assess the probability of failure of a lightning protection system, accounting for the statistical distribution of lightning in the area of the system to be protected.

Lightning Shielding Methods

Five Shielding System Positioning Methods (SSPM) are presently supported by the program. These methods are described in the pertinent IEEE[1] and IEC[2] standards and include:

  • Electrogeometric Model (commonly implemented as the Rolling Sphere Method).
  • Eriksson Electrogeometric Model.
  • Protection Angle Method.
  • Mesh Method.
  • Collection Volume Method.

A shielding failure analysis option is also available to determine the rate of shielding failure based on lightning data statistics specified by the user.


The program uses an object-oriented approach to describe the geometry that allows you to select, copy, paste and delete the objects.

  • Import geometries created with SESCAD (which can import DXF files) and saved as a MALT, MALZ or HIFREQ session file. A SESShield-3D system can be converted into a format readable by MALT, or imported into MALZ or HIFREQ and editable with SESCAD.
  • Make adjustments to your shielding system on the fly and immediately see how effective these modifications are.
  • The program accounts for the dimensions of all components in the studied system, including any portions of a structure that are below grade.
  • Alerts the user of the presence of unprotected zones which may not have been noticed by the user in the main graphical interface.
  • Insert fully constructed objects in the system to be analyzed, or store your own objects for future use.
  • Several rendering modes are available for analyzing results.

The following figures illustrates four shielding methods that can be used in SESShield-3D:

Rolling Sphere Method.

Protection Angle Method.

Erikson Electro-geometric Method.

Mesh Method.

[1] IEEE Std-998 - IEEE Guide for Direct Lightning Stroke Shielding of Substations
   IEEE Std-1243 - IEEE Guide for Improving the Lightning Performance of Transmission Lines
[2] IEC Std-62305-1 Ed. 1.0 - Protection Against Lightning