Analysis and simulation of low voltage grounding networks

ABSTRACT Low voltage earthing systems have been analysed and voltage value in neutral line has been researched and simulated with different parameters for practice at a low voltage earthing system. Before this analysis, first of all was informed about structure, working and fault behaviour of low voltage earthing systems. There were explanation about low voltage earthing systems' purpose and earthing metarials and low voltage earthing systems (TT, TN and IT systems ). Then preliminary informations were given fault behaviour and change in the value of voltage on neutral line at low voltage earthing systems. After this part, how to occur harmonics, primer harmonic sources, basic formulas, harmonic modelling (behaviour of resistance and reactance at harmonic condition) and standards was given. These informations were applied to the harmonic systems. These states were explanation for fault behaviour and voltage value on neitral line. Finally a model has been proposed at Matlab® program with these general informations. This model was analysed for different states and parameters as current states ( fundamental component or harmonic components), cross sectional area (2.5 mm2 and 4 mm2), loading states (full loading and half loading), neutral line lenght. Then Matlab® application results were obtained. Change in the value of neutral conductor's voltage has been represented in terms of the charts. Keywords: Grounding, Harmonics, neutral-earth voltage, MATLAB, LV Grounding types x