Analysis of Internal Faults in the 20 Kv Medium Voltage Network of Underground Lines
Keywords:
Medium Voltage Network, 20 kV, Underground Line, Internal Interference, Protection SystemAbstract
The reliability of a 20 kV medium voltage (JTM) network with an underground conduit configuration is greatly influenced by the characteristics of the internal faults that occur in the system. Internal disturbances in underground ducts are generally caused by degradation of cable insulation, joint and termination failures, as well as thermal and environmental moisture influences. This study aims to analyze the type, characteristics, and impact of internal disturbances on the 20 kV underground line network and evaluate the performance of the protection system used. The research methods include the collection of network technical data, analysis of internal short circuit faults, and evaluation of the response of overcurrent protection reles and ground disturbances. The results of the analysis showed that single-phase disturbance to the ground was the most dominant internal disturbance with a contribution of more than 60% of the total disturbance. In addition, the interference impedance and the location of the interference have a significant effect on the size of the interference current and the disconnection time of the protection system. This research is expected to be a reference in improving the reliability and safety of the operation of the 20 kV underground line network.
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