You are here

Improvement of methods of calculation of lightning resistance of overhead lines with protected wires


Work number - M 73 FILED

Presented National Technical University "Kharkiv Polytechnic Institute"

Authors:
Ph.D., Assoc. Prof., Danylchenko D.O., Ph.D., Dryvetskyi S.I., Shtangey I.O.

The work is devoted to solving a topical scientific and applied problem in the field of lightning protection of overhead power lines with protected wires of medium voltage classes from direct lightning strikes.

The paper experimentally proves that protected wires are less likely to be struck by direct lightning strikes than uninsulated wires. This is due to the protective sheath of the shielded wires, because the conditions of the oncoming leader are much more difficult, and the area of ​​capture of lightning is significantly reduced. The current methods of calculating the number of direct lightning strikes do not take into account the type of wire on the overhead power line, which leads to incorrect calculations of the number of direct lightning strikes, and, as a consequence, the number of line outages. Due to the low impulse strength, the insulation of the distribution networks is prone to overlaps both from overvoltages during direct lightning strikes and from induced overvoltages during lightning strikes near the line. The latter are the main cause of thunderstorms and damage to equipment of 6-35 kV networks, amounting in some cases to 90%, and when passing the route of the line through the forest and up to 100% of their total number. Thus, the reliability of electricity supply to consumers largely depends on the effectiveness of lightning protection.

The obtained results allowed to create a new approach to lightning protection of overhead lines with shielded wires, to create a combined power line. This line contains in its design protected wires and uninsulated wire, which acts as a lightning protection cable. The created model of the combined line was experimentally tested, no lightning strike in the protected wires was recorded.

 

Number of publications: which on the topic of scientific work - 39). According to the Scopus database, the total number of references to the authors' publications presented in the paper is 9, h-index (by work) = 2; according to the Google Shcolar database, the total number of links is 19, h-index (by work) = 3. 2 candidate dissertations have been defended on this topic.

Comments