Захист ліній електропередавання з захищеними проводами від наведених блискавкою перенапруг

Abstract

Dissertation for the degree of candidate of technical sciences in specialty 05.14.02 - Electric power stations, networks and systems. National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2019. The thesis is devoted to the solution of an actual scientific and applied problem in the field of lightning protection of overhead power lines with protected wires medium voltage classes from lightning induced overvoltages arising from lightning strikes near a power line. It has been experimentally proved that the lines of electric transmission with protected wires at lightning strikes near the line, pointing at their phase wires, overvoltages are much smaller than the lines of the same class of voltage only with non-insulated wires. This is due to the protective shell of protected wires, since the conditions of an overvoltage which can pierce the garland of insulators are much less likely. Current methods for calculating the number of thunderstorms in the lines of the class of voltage 6-35 kV, do not take into account the type of wire on the PL, which leads to incorrect calculations of the number of thunderstorms and, as a consequence, the number of offsets of the line. The obtained results allowed to create a new approach to lightning protection of PL with protected wires, to create a device for protection of electric lines without the cost of its production and installation. The generated model of the protective device was experimentally tested, no induced overvoltage failed to break the wire isolation.