Analysis of substation earthing in quasi-stationary and transient conditions

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Supervisor:
Dr. Ladányi József
Department of Electric Power Engineering

My thesis’ purpose is to examine substation grounding networks including related definitions, regulations, measurements, limits using relevant literature, modeling transient and quasi-stationer phenomenons with a Canadian engineer software based on a real grounding system and evaluate the results.

In the first part of my thesis I examine the roles and structures of grounding systems using related literature. Before the detailed discussing of the theme, I describe the most important definitions and specifics of groundings, related measurement methods and their operations then make a research how to calculate different types of groundings with analitic progresses.

I investigate the relevant standards of this topic what is the next chapter then summarize the related requirements, regulations, limits and the main steps to design a grounding system.

Then I introduce the examined 400/120 kV subtation which is being built in Perkáta. The plans are provided by Poyry Erőterv Zrt. where I fulfilled my cumpolsory internship. During the internship me and a colleague of mine measured the soil resistivity at the location, the method and the results are described below.

After all the model in the CDEGS software packages are built and examinations are processed for transient (lighting) and quasi-stationer (earth-fault current) conditions.

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