Вісник № 32
Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/32872
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Документ Study of the effect of atmospheric overvoltages on overhead lines of medium voltage classes(НТУ "ХПІ", 2017) Danylchenko, DmytroThe article is devoted to the effect of atmospheric overvoltages on the operation of overhead lines of electrical distribution networks with protected and bare wires. The article deals with the methods of protection and their effectiveness in lightning storms used in Ukraine and in the world. The influence of lightning and line parameters on the probability of a direct lightning strike in the overhead line is considered. The technique for calculating direct lightning strikes in a line is analyzed. A new approach to the simulation of overhead lines affection by direct lightning strikes is applied by modeling the height of the orientation of the lightning. It is described the creation of a large-scale model for conducting experimental studies, with the possibility of changing the parameters of lightning (lightning current) and overhead line parameters (line voltage, type of wire). The data allowing to determine the zone of the zipper capture for the lines with the protected wires and the bare wires by the experimental method are obtained. Due to the obtained data, it is possible to more accurately determine the number of direct lightning strikes in overhead lines. The possibility of creating an overhead transmission line using a combination of bare wire and protected wires is considered. With this configuration, the striking effect of lightning on bare wires will be significantly reduced, and the bare wire in addition to the phase conductor will act as a lightning protection cable. An experimental model of a combined power transmission line has been created and its effectiveness has been experimentally confirmed. Conclusions are made about the possibility of using an overhead power line with combined wires for medium voltage classes.