This study discusses the analysis of voltage dips in the 20 kV distribution system due to short circuit currents that occur in the GI 20kV Millenium feeder, which is under the management of PTPLN (Persero) UP2D Banten. Voltage dips are a decrease in voltage at any time that can have an impact on the stability of the operation of customer electrical equipment, especially in the industrial sector. The purpose of this study is to determine the magnitude of voltage dips that occur due to short circuit disturbances and their effect on the quality of electric power in the distribution network. The method used in this study involves analytical calculations based on system parameters and fault simulations conducted at 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% distances along the feeder. The network modeling was carried out using simulation software, and the simulation results were analyzed with reference to voltage dip tolerance standards based on IEEE and SPLN.The research findings show that the highest short-circuit current occurs in a threephase-to-ground fault with a magnitude of 1,647.989 A ∠67.945°, followed by a two-phase fault at 1,427.200 A ∠67.945°, and a single-phase-to-ground fault at 249.628 A ∠20.853°. Meanwhile, the highest voltage dip is observed during a two-phase fault between phases R and S, reaching 34,121.451 V, which causes the unaffected phase (phase T) to experience a voltage level exceeding the normal system voltage. The analysis also indicates that the distance of the fault significantly affects the magnitude of the voltage dip, with the trend of increasing or decreasing dip values depending on the type of fault. Therefore, mitigation strategies such as the installation of appropriate protection devices and proper network maintenance are essential to minimize the impact of such disturbances.