@article{Baranov_2019, title={REFINED SELECTION OF ALLOWABLE CROSS-SECTIONS OF ELECTRICAL CONDUCTORS AND CABLES IN THE POWER CIRCUITS OF INDUSTRIAL ELECTRICAL EQUIPMENT TAKING INTO ACCOUNT EMERGENCY OPERATING MODES}, url={http://eie.khpi.edu.ua/article/view/2074-272X.2019.3.06}, DOI={10.20998/2074-272X.2019.3.06}, abstractNote={<strong><em>Purpose.</em></strong><em> Implementation and clarification of the existing engineering approach for determination in industrial power engineering for allowable sections of cable-conductor products (CCP) S<sub>il</sub> of electric wires and cables in the circuits of electrical equipment of the general industrial installations characterized flowing in malfunction of current i<sub>k</sub>(t) of short circuit (SC) with different amplitude-temporal parameters (ATPs). <strong>Methodology.</strong> Scientific and technical bases of electrical power engineering, electrophysics bases of technique of high voltage and high pulse currents, theoretical bases of the electrical engineering. <strong>Results.</strong> The results of the developed engineering approach are resulted in the calculation determination on the condition of thermal resistibility of CCP permissible sections of S<sub>il</sub> of the uninsulated wires, insulated wires and cables with copper (aluminum) cores (shells),</em> <em>polyvinyl chloride (PVC), rubber (R) and polyethylene (PET) insulation, on which in malfunction of their operation the current i<sub>k</sub>(t) of SC can flow with the set by normative documents of ATP. It is shown that divergence between the values of basic calculation coefficient of C<sub>ik</sub> by existing and offered to the engineering calculations selection of permissible sections of S<sub>il</sub> of cores (shells) of the tested wires and cables for normal of their operating time at the nominal current load of CCP makes no more (3-8) %, and in the mode of de-energizing of CCP arrives at to (9-26) %.. Analytical correlation is got for the specified calculation determination of integral of action of J<sub>ak</sub> of current i<sub>k</sub>(t) of SC (Joule integral) in the power circuits of the tested electrical equipment. It is set that in the circuits of of the general industrial installations (for permanent time of slump of T<sub>a</sub>=20 ms of aperiodic constituent of current of SC) maximum possible amplitudes of density of δ<sub>ilm</sub>≈I<sub>mk</sub>/S<sub>il</sub> of SC current at time of his disconnecting t<sub>kC</sub>=100 ms for the uninsulated wires with copper (aluminum) cores make according to approximately 0.64 (0.36) кА/mm<sup>2</sup>, for cables with copper (aluminum) cores (shells), PVC and R insulation – 0.47 (0.30) кА/mm<sup>2</sup>, and for cables with copper (aluminum) cores ( shells) and PET insulation – 0.39 (0.25) кА/mm<sup>2</sup>. At time of disconnecting t<sub>kC</sub>=160 ms of SC current in the circuits of electrical equipment (T<sub>a</sub>=20 ms) permissible amplitudes of current density of δ<sub>ilm</sub> of SC for the unsuolated wires with copper and aluminum cores are accordingly about 0.52 (0.29) кА/mm<sup>2</sup>, for cables with copper (aluminum) cores (shells), PVC and R insulation of 0.39 (0.25) кА/mm<sup>2</sup>, and for cables with copper (aluminum) cores (shells) and PET insulation – 0.32 (0.21) кА/mm<sup>2</sup>. <strong>Originality.</strong> First by a calculation the specified numeral values of sections of S<sub>il</sub> and amplitudes of density δ<sub>ilm</sub> of SC current are determined for the uninsulated wires, insulated wires and cables with copper (aluminum)cores shells), PVC, R and PET insulation. New analytical correlation is offered for the calculation estimation of thermal resistibility of tested CCP to the action of current of SC. <strong>Practical value.</strong> The obtained results will be useful in the increase of thermal resistibility of CCP with copper (aluminum) cores (shells), PVC, R and PET insulation, widely applied in the power circuits of electrical equipment of the general purpose industrial installations.</em>}, number={3}, journal={Electrical Engineering & Electromechanics}, author={Baranov, M. I.}, year={2019}, month={Jun.}, pages={37–43} }