Abstract
Subject of research: single-phase earth faults in electrical networks of medium voltage class.
 Purpose of resarch: the development of a simulation model for the analysis of transient processes that occur during a "metallic" single-phase earth fault in a 35 kV electrical network.
 Object of research: distribution electrical networks 6-35 kV operating in isolated neutral mode.
 Main results of research: a simulation model was developed in the Matlab Simulink environment, which makes it possible to analyze the oscillograms of currents and voltages during a single-phase earth fault in networks with an isolated neutral. A method for determining the outgoing line with an earth fault is presented, based on the superimposition of non-power frequency currents. The source frequency is determined based on the condition for the occurrence of a resonant mode. Oscillograms are presented, from which it follows that the current in the damaged phase increases by more than 2 times, which makes it possible to selectively determine the damaged connection.
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