Abstract
One of the most common and difficult problems to solve in distribution power systems is the location and elimination of the ground fault. For the study of an electrical distribution network in ungrounded system operating at 20 kV on the primary and 380 V on the secondary. The model uses smaller nominal voltages consisting of 380 V on the primary and the secondary. The Ground fault protection system scheme uses over voltage relays and open break delta transformers, whereas for fault location detection using voltage transformers in star star connections.The highest single line to ground fault value is used for consideration of ballast rating selection. The single line to lowest ground fault value is used for setting the threshold on the voltage relay (59N). Referring to the result of the calculation of the highest single phase to ground voltage at point 1 is 144∠1800 volts, and the lowest point at 4 is 132∠1800 volts. A 200 ohm ballast impedance with 150 watts of power capacity, and an overvoltage threshold setting of 120 volts with TDS of 40. One phase fault protection mechanism works well at each point of interference, and voltage transformers are protected from overheating and damage.
Highlights
An ungrounding system is an earthing method that does not have a direct relationship between the starpoint of a power transformer and the ground
remote ground-fault indicator (RGFI) is connected to the zero sequence current of the transformer
We developed a design product for studying the soil disturbance protection in an ungrounding system of electric power distribution at a voltage of 20 kV on the primary and 380 V on a secondary, which was established at the Laboratory of Electric Power Distribution Systems, Bandung
Summary
An ungrounding system is an earthing method that does not have a direct relationship between the starpoint of a power transformer and the ground. T. shows a fault detection method in ungrounding and high impedance earthing systems using zero sequence current generator injections [1,2]. When a ground disturbance is detected, the related relay initiates a signal generator to supply current through a system of looping back through the ground network after reaching the point of interference. The distance of electricity from the relay to the point of interference will be determined from the propagation of the signal generator. RGFI is connected to the zero sequence current of the transformer. When line-to-ground interference occurs, RGFI detects currents through a zero sequence and Jurnal Rancang Bangun dan Teknologi
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