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Electrothermal Action of the Pulse of the Current of a Short Artificial-Lightning Stroke on Test Specimens of Wires and Cables of Electric Power Objects

  • M. I. Baranov
  • S. V. Rudakov
Article
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The authors have given results of investigations of the electrothermal action of aperiodic pulses of temporal shape 10/350 μs of the current of a short artificial-lightning stroke on test specimens of electric wires and cables with copper and aluminum cores and sheaths with polyvinylchloride and polyethylene insulations of power circuits of industrial electric power objects. It has been shown that the thermal stability of such wires and cables is determined by the action integral of the indicated current pulse. The authors have found the maximum permissible and critical densities of this pulse in copper and aluminum current-carrying parts of the wires and cables. High-current experiments conducted under high-voltage laboratory conditions on a unique generator of 10/350 μs pulses of an artificial-lightning current with amplitude–time parameters normalized according to the existing requirements of international and national standards and with tolerances on them have confirmed the reliability of the proposed calculated estimate for thermal lightning resistance of cabling and wiring products.

Keywords

pulse current short-stroke lightning wires cables industrial electric power objects thermal lightning resistance 

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Authors and Affiliations

  1. 1.Research and Design Institute “Molniya,” National Technical University “Kharkiv (Kharkov) Polytechnic Institute”KharkovUkraine
  2. 2.National University of Civil Protection of UkraineKharkovUkraine

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