President’s Column

What’s New in CDEGS



New Programs

Text Box: Text Box: What’s New in CDEGS

Specialized Packages

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President’s Column

What’s New in CDEGS

Specialized Packages

ROWCAD/Right-of-Way: Total Interference under    Steady-State, Arcing Distance, KML files, and much  more…

Many new features and capabilities have been added to the Right-of-Way and ROWCAD programs since the last User’s Group Meeting.

Among the Right-of-Way improvements, the calculation of the total interference level is now fully integrated and automated, making it possible to account for both inductive and conductive effects under steady-state conditions. Plots of Touch Voltages and 1 cm2 Holiday Leakage Current Density under steady-state were also added to display the results of this analysis.

Also, the calculation methods of soil maximum breakdown distance and of fault arcing and flashover distance introduced last year were improved, and new options were added.

Another interesting enhancement is the option to define the enclosure of a Group path as a “Dummy” or virtual conductor, making it possible to quickly define a group of cables running parallel to each other, within a trench or duct.

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New Programs

Over the past few years, the ROWCAD module has simplified data specification for Right-of-Way. This version of ROWCAD continues this trend.

ROWCAD is now outfitted with a convenient Keyhole Markup Language (kml) file import feature. Latitude and longitude are converted via a Universal Transverse Mercator projection: paths are converted to Polylines and placemarks to Entities. In addition, you can choose how the system is centered to avoid large coordinates, thereby streamlining your work with GPS coordinates and Right-of-Way, and resulting in a simpler, more accurate model creation process.

ROWCAD now also allows you to define a minimum cut length for region generation. In some cases, this will lead to far fewer generated regions, saving substantial computation time and greatly reducing file sizes, all while maintaining computational accuracy.

The user experience in ROWCAD is enhanced with a new sleeker viewer toolbar, more ergonomic polyline and path manipulation button locations in the Paths panel, along with background gridlines to help visualize distances and positions of objects in the system.

CorrCAD: Coating Effective Resistance, Changes of Cross-Section, and Improved Display

CorrCAD is a software package dedicated to the analysis and design of cathodic protection system that made its debut at the 2015 Users Group conference. CorrCAD can solve a large variety of cathodic protection design tasks and related issues for various onshore and offshore projects.

Since it was first introduced, several enhancements were made to CorrCAD:

· The coating effective resistance of pipelines and other structures can now be modeled using discrete or distributed elements. This can be useful, for instance, when modeling a coated pipe for which polarization data in the presence of coating is not available.

· Different cross-sections can be assigned along the polyline defining the structure to be protected. This makes it easier, for instance, to model cases where the characteristics of the structure (e.g., radius of a pipeline) change along its length, to model the presence of insulating joints, and so on.

· The SESCurveFit tool which is used in CorrCAD to fit polarization curves to analytical formulas was enhanced with the addition of a new, more accurate form of polynomial fit. This new Chebyshev polynomial option can be useful when trying to fit polarization data that does not conform well to the traditional Butler-Volmer curves.

· Several options were added to control the display of the results. Also, background items were added in the main drawing area to provide useful information about the drawing.












SESShield-3D: Accuracy Level and Component Identification

SESShield-3D is a software package that can be used to analyze and design shielding systems against lightning. Many user-interface enhancements were introduced in this software package over the past year to help quickly identify objects in a model. For example, it is now possible to label components in a model with their name or their component number. The components displayed in a model can also be shown or hidden based on their protection status. This can be useful to quickly visualize all components of the model that are part of the protection system or those that need to be protected. The way selected objects and components are displayed and distinguished from other objects and components was also improved, with options to highlight the entire object (group) to which a selected component belongs, only the component itself, or both.

Also, geometrical data can now be imported from MALZ and HIFREQ files, in addition to MALT and SESShield-3D files, as was already available, and the objects imported from the SESShield-3D Object Database can now be scaled and positioned anywhere in the model.

From a computational point of view, the Accuracy Level with which the interception surfaces are approximated with polygons can now be controlled, providing a trade-off between computational accuracy and computation time.

SESEnviroPlus: User-Defined Methods for Corona Performance

The SESEnviroPlus software package evaluates the environmental impact of AC/DC transmission lines. An important aspect of the effects of transmission lines on the environment that can be evaluated using SESEnviroPlus is the levels of Audible Noise and Radio Interference that they generate. The program can also evaluate the losses on the lines due to corona effects. A large number of empirical methods have been proposed in the literature to compute those quantities, and SESEnviroPlus supports several of those methods. However, the formulas and empirical coefficients used in the formulation of those methods are not accessible and cannot be modified, making it difficult to use SESEnviroPlus to calculate corona performance parameters for methods that differ from the built-in methods in SESEnviroPlus.

This version of SESEnviroPlus introduces a new User-Defined method that takes care of this problem. This new method makes it possible to:

· Change the coefficients of the existing (built-in) methods.

· Create new methods.

· Change, add or ignore corrections.