program version : WinIGS 7.2 - January 2018
Features in Version WinIGS 7.2
Improvements in Large Scale Grounding System Analysis. A new grounding analysis option was added which allows handling of grounding systems containing a very large number of ground electrodes. This option uses a new grounding electrode model, which dramatically reduces the random-access memory and run-time required for the simulation of such systems. This options provides a fast and accurate method for the safety evaluation of large utility scale PV plants containing tens of thousands of steel posts, which are bonded to the plant grounding system.
Features in Version WinIGS 7.1
SDA Enhancements. Record/Playback, Damping Factor Enhancemets, etc. Also, added support for periods and spaces in directory names.
Features in Version WinIGS 7.0
Multi-Layer Soil Modeling. The geometric ground model now supports up to 4 soil resistivity layers. Soil model with 3 or 4 layers are modeled using the complex depth image method. Furthermore, the soil data interpretation tools now provide 2 or 3 resistivity layer models. Specifically, two and three resistivity layer soil models can be derived from either Wenner, Schlumberger, or Driven-Rod soil measurement data.
Rotatable Uniform Rectangular Ground Mat. The rectangular uniform ground mat element can now be rotated about a vertical axis by any angle
Reduced Network Impedance/Admittance Matrix. A new analysis option has been added which provides the network admittance or impedance matrix at a user defined port. The user defined port may consist of up to 8 user selected nodes.
Identify Ungrounded Derived Systems. A new analysis command has been added which identifies any parts of the network that do not have a path to ground. Specifically, this command displays a list of bus names for which a path to ground does not exist.
Horizontal Earth Current Frames. Earth current flow reports can now be obtained via either vertical or horizontal frames. The current frame orientation can be selected using the Vertical / Horizontal radio buttons in the frame’s properties window.
Features in Version WinIGS 6.1
Phase Conductor Clearance Analysis. A new analysis tool was added to the geometric grounding model. This tool computes the minimum distances from all phase conductors to the ground and other nearby objects such as buildings, fences, light poles, etc. The computed minimum distances are compared to user specified minimum permitted distances, and clearance violations are reported in both tabular and graphical form.
Features in Version WinIGS 6.0
Grounding Model D. A new option was added to the geometric grounding model (Model D). This option takes into account the inductance of the ground electrodes comprising a grounding system. This allows for a more accurate computation of the voltage drop along the ground conductors as well as the resulting touch and step voltages. The effect of ground conductor inductance is significant in large grounding systems installed in very low resistivity soil (below 10 ohm meters).
The grounding editor and most network elements (transmission lines & cables) as well as the Conductor, Tower, and Cable Library Editors now optionally support metric units.
Additional information on past versions is available under the "New Features" section of the WinIGS program online help.
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