The article presents the results of substantiating diagnostic parameters for a multiparametric remote monitoring system of overhead power lines based on the use of an unmanned aerial vehicle (UAV). Significant wear of the structural elements of overhead power lines (OHL) in the IPS of Ukraine, exacerbated by the impact of climate change, leads to an increase in the number of damages. This makes proper maintenance of OHL a priority task. Existing technical diagnostic systems based UAVs are mainly aimed at solving narrow specialized tasks. Therefore, there is a need to develop more universal and comprehensive systems. The analysis of operational defects in the structural elements of OHL has shown that most of these defects manifest as visible mechanical damages, while others remain hidden. Detection of such defects is possible through remote non-destructive testing methods. Based on typical defects, a list of diagnostic parameters for a 110 kV overhead line was formulated. Considering that OHL elements have the same probability of failure, only those defects that may pose a threat to its operability in the near future were considered. Based on the selected defects and diagnostic parameters, a table of possible states of the OHL was compiled. The selection of the necessary and sufficient group of diagnostic parameters was carried out based on their average informativeness, which characterizes the degree of entropy reduction of the overhead line. The main key aspects of the study are: - existing technical diagnostic systems for overhead power lines based on UAVs are mainly focused on solving specialized tasks for specific power grid areas and are not universal. This limits their adaptation to different operating conditions and indicates the need for more comprehensive systems capable of addressing a wide range of power grid issues; - the majority of defects in the structural elements of overhead power lines appear as various cracks, chips, fractures, breaks, loss of fastening elements, and corrosion, while the remaining defects are hidden, such as weakened wire connections and zero insulators. All these defects can be detected using remote non-destructive testing methods; - given the accepted limitations, the most informative group for diagnosing the state of an overhead power line consists of seven parameters, including visual signatures of defects, temperatures of conductors and contact connections, as well as discharge activity of insulators and conductive parts

overhead power line, operational defect, unmanned aerial vehicle, UAV, information theory, diagnosis, diagnostic parameter

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