Abstract
<jats:p>The problem of detecting the emergency operating modes of a 0.4 kV electrical network caused by single-phase ground faults and various types of wire breaks is urgent. The phase shift angles between currents and voltages can be used to increase the reliability of recognizing the emergency operating modes of a 0.4 kV electrical network. The study of phase shift angle distribution between currents and voltages in the on-load and emergency operating modes of a 0.4 kV electrical network was implemented on a computer model, the prototype of which is a 0.4 kV 1000 meter-long radial overhead transmission line connected to a transformer with the rated power of 250 kVA. In the course of computer modeling, it was found that monitoring of currents and voltages combined with monitoring of phase shift angles between them can increase the reliability of recognizing the emergency operating modes caused by single-phase ground faults and phase wire breaks in a 0.4 kV electrical network. It has been revealed that the phase shift angles are not a reliable parameter that can be used to identify the modes of the neutral wire break in a 0.4 kV network and the phase wire break at the 10 kV side.</jats:p>