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The overvoltage protection devices on low-voltage power lines (SPD) are often made using GDA and MOV technology. The selection, proper use and installation of overvoltage protective devices, taking into account the effect of line length and the types of combinations that will affect the protection efficiency, is essential. This paper builds GDA and MOV models with high similarities to the prototype. The evaluation of protection efficiency with different types of coordination and the effect of line length was investigated by simulation-modeling method in simulink environment of Matlab software. Keywords— GDA (Gas Discharge Arrester), MOV (Metal Oxide Varistor), SPD (Surge Protective Device), Protection Efficiency, Simulink, Matlab.

Study the Line Length Impact on the Effective of Overvoltage Protection in the Low Voltage Network