Comparison of MULTC and CDEGS software from the point of view network calculation

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Supervisor:
Dr. Ladányi József
Department of Electric Power Engineering

The purpose of my thesis is to compare the faculty developed MULTC software suite and the Canadian developed CDEGS suite for network calculations, through concrete examples. These calculations involve the causes and effects of potential increase in substations, therefore I review these processes as well.

In the first section, I describe the MULTC software, its underlying modeling and calculation methodology, and I present the advantages and possible applications of the employed methods.

In the second section I present the different modules available in the CDEGS suite with areas of application.

In the third section I review the processes affecting the substation grounding grids. In the occurrence of a substation ground fault the earth leakage current flows in various circuits and only a portion of it flows in to the earth through the grounding grid, I examine these paths and the related causes. Substation grounding resistance is affected by the connecting grounded metallic conductors and these can be earth wires or passive grounded conductors, I examine the effects of both on current distribution.

In the fourth section I describe the simulation model with the possibility of changing substation and overhead line parameters. I also present simulation with the SPLITS module of the CDEGS suite in detail.

In the final section I use calculation results both software suites and review the properties of currents originating from the inductive and conductive effects, with emphasis on the difference between end results.

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