Abstract

This study investigates the optimization of zero-sequence parameters in IT-type power distribution networks to enhance the reliability and safety of electrical installations under earth-fault conditions on the power receiver side. The research analyzes the influence of network configuration, grounding impedance, and load characteristics on the magnitude of zero-sequence currents and voltages that arise during single-phase faults. A computational methodology is developed to determine optimal parameter settings that minimize fault currents while ensuring adequate fault detection sensitivity. Simulation modeling is used to evaluate various operational scenarios and identify parameter combinations that improve system stability and reduce the risk of equipment damage. The results demonstrate that the proposed optimization approach can significantly increase fault-tolerance, enhance protection coordination, and support more efficient operation of IT-type power supply systems. The findings provide practical recommendations for engineers involved in the design and maintenance of networks where earth-fault management is critical.

Keywords: zero-sequence, protection parameters, single-phase faults, zero-sequence currents, power network optimization, relay protection

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