This paper presents a non-conventionally installed HV/MV underground substation from the point of view grid resistance. The effects of the infeed high voltage (HV) cables and the connected medium voltage (MV) distribution cables on the resultant earthing resistance are studied. The grid resistance was calculated by the CDEGS software code in the design phase. Further more the grid resistance was measured both before and after the installation and jointing the connecting cable lines. The paper presents results on the frequency dependence of the grid resistance as well.
The traction current of an a.c. railway line is flowing through the catenary and feeder conductor to the traction unit and returns through the rail and earth to the feeding substation. The new signalling system (ETCS) allows for the use earth return conductor connected in parallel with the rail. In this paper the mostly advantageous effects of the earth return conductor are investigated, based on simulation calculations.
ÖsszefoglalásA váltakozó áramú villamos vasútvonal hosszláncán és tápvezetékén folyó vontatási áram a vasúti sínben és a földben folyik vissza a tápláló alállomás felé. Az új rendszerű biztosítóberendezések (ETCS) esetén lehetőség van a sínekkel párhuzamosan kapcsolt földáram-visszavezető alkalmazására. A cikk ennek az energiaellátás és EMC szempontjából többnyire kedvező hatásait vizsgálja szimulációs számítások alapján.
In this paper the earthing resistance of substations with different earth electrode and soil structures is investigated by simulation studies with the use of CDEGS (Current Distribution, Electromagnetic Fields, Grounding and Soil Structure Analysis) software code. The paper presents the effect of grid geometry, soil characteristics, the effectiveness of the vertical earth rods and the conductor diameter.
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