A CHOICE OF ACCEPTABLE SECTIONS OF ELECTRIC WIRES AND CABLES IN ON-BOARD CIRCUITS OF AIRCRAFT ELECTRICAL EQUIPMENT

Authors

DOI:

https://doi.org/10.20998/2074-272X.2020.1.06

Keywords:

aircraft, on-board power circuits of electrical equipment, electric wires and cables, frequency of alternating current, selection of maximum permissible cross-sections of cable products

Abstract

Purpose. Implementation of choice of maximum permissible sections Sil of the uninsulated wires and insulated wires (cables) with copper (aluminum) cores (shells) in the on-board power circuits of electrical equipment of different aircrafts with AC current of frequency f>50 Hz. Methodology. Theoretical bases of the electrical engineering, electrophysics bases of technique of high voltage and high pulsed currents, applied thermal physics. Results. The engineering approach is developed for a calculation choice on the condition of thermal resistibility of aircraft cable-conductor products (CCP) of maximum permissible sections Sil of the uninsulated wires, insulated wires and cables with copper (aluminum) cores (shells), polyvinyl chloride (PVC), rubber (R) and polyethylene (PET) insulation, on which in malfunction of operation of on-board aircraft network with AC frequency of f>50 Hz flows of ik(t) current at single phase short circuit (SC) with given amplitude-temporal parameters. It is determined that in the on-board power circuits of electrical equipment of aircrafts (f=400 Hz; for permanent time of slump of Ta=3 ms of аperiodic constituent of current of SC) maximum permissible amplitudes of current density of δilm≈Imk/Sil of single phase SC at time of its disconnecting tkC=5 ms in the on-board network of aircraft without dependence on the numerical value of amplitude Imk of the given current of SC for the uninsulated wires with copper (aluminum) cores is accordingly about 2.48 (1.40) kA/mm2, for wires (cables) with copper (aluminum) cores (shells) and PVC (R) with insulation – 1.85 (1.18) kA/mm2, and for wires (cables) with copper (aluminum) cores (shells) and PET insulation – 1.53 (0.99) kA/mm2. The influence on a choice in the on-board network of aircrafts of maximum permissible sections Sil of its CCP and accordingly maximum permissible amplitudes of current density δilm of current copper (aluminum) parts of its wires and cables of frequency f of AC in the on-board network of aircraft is determined, but duration of flow tkC (time of disconnecting) renders in the on-board network of aircrafts of emergency current of SC ik(t. For diminishing in the on-board power circuits of electrical equipment of aircrafts of maximum permissible sections Sil of the electric wires (cables) applied in them and accordingly providing of decline for different aircrafts of mass and overall indicators of their on-board CCP is needed in the on-boar networks of aircrafts along with the use of enhance frequency of f=400 Hz of AC to apply the fast-acting devices of their protecting from SC in course of time wearing-outs of ta<<100 ms. It isshown that application of enhance frequency of f=400 Hz of AC in the on-board networks of aircrafts as compared to its frequency of f=50 Hz results in the considerable increase (in four times) of fast-acting of devices of their protection from SC, operation of which is based on the air electric explosion of metallic wire. Originality. First for the on-board network of aircrafts with AC of frequency of f=400 Hz the maximum permissible sections Sil and amplitudes of current density  δilm of SC are determined for the uninsulated wires and insulated wires (cables) with copper (aluminum) cores (shells), PVC, R and PET insulation. Practical value. Theobtained results will be used in the increase of thermal resistibility of CCP with copper (aluminum) cores (shells), PVC, R and PET insulation applied in the on-board electric networks of different aircrafts. 

References

Baranov M.I. 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. Electrical engineering & electromechanics, 2019, no. 3, pp. 37-43. doi: 10.20998/2074-272X.2019.3.06.

Baranov M.I. A choice of critical sections of electric wires and cables in power circuits of electrical equipment of power industry. Electrical engineering & electromechanics, 2019, no. 5, pp. 35-39. doi: 10.20998/2074-272X.2019.5.06.

Barybin Yu.G. Spravochnik po proektirovaniyu elekricheskih setey i oborudovanija [Handbook per planning electrical circuit and equipment].Moscow, Energoatomizdat Publ., 1991. 464 p. (Rus).

Knyazevskyi B.A., Lipkin B.Yu. Elekrosnabzhenie promyschlennyh predpriyatij [Electric supply industrial organization].Moscow, High school Publ., 1972. 432 p. (Rus).

Available at: https://docplayer.ru/27377176-Lekciya-2-1-razdel-2-bortovaya-elektricheskaya-set-vozdushnogo-sudna-tema-2-1-elektricheskaya-provodka.html (accessed 23 May 2019). (Rus).

Available at: https://ru.wikipedia.org/wiki/Бортовая_система_электроснабжения_летательных_аппаратов (accessed 11 May 2019). (Rus).

Belorussov N.I., Saakjan A.E., Jakovleva A.I. Elektricheskie kabeli, provoda i shnury. Spravochnik [Electrical cables, wires and cords. Directory]. Moscow, Energoatomizdat Publ., 1988. 536 p. (Rus).

Orlov I.N. Elektrotehnicheskij spravochnik. Proizvodstvo i raspredelenie elektricheskoj energii. Tom 3, Kn. 1 [Electrical engineering handbook. Production and distribution of electric energy. Vol. 3, Book 1. Ed. I.N. Orlov]. Moscow, Energoatomizdat Publ., 1988. 880 p. (Rus).

Knopfel' G. Sverkhsil'nye impul'snye magnitnye polia [Ultra strong pulsed magnetic fields]. Moscow, Mir Publ., 1972. 391 p. (Rus).

Baranov M.I. An anthology of the distinguished achievements in science and technique. Part 48: Aircraft designer Andrey Tupolev and his accomplishments in airplane design. Electrical engineering & electromechanics, 2019, no.2, pp. 3-8. doi: 10.20998/2074-272X.2019.2.01.

Khalyutin S.P. Sistemy elektrosnabzheniya letatel’nyh apparatov [Systems of electric supply of aircrafts]. Moscow, AFEA to the name of N.E. Zhukovskogo Publ., 2010. 428 p. (Rus).

Baranov M.I. Izbrannye voprosy elektrofiziki. Monografiya v 3kh tomakh. Tom 3: Teorija i praktika elektrofizicheskih zadach [Selected topics of Electrophysics. Monograph in 3 Vols. Vol. 3. Theory and practice of electrophysics tasks]. Kharkiv, Tochka Publ., 2014. 400 p. (Rus).

Otraslevoy standart OST 1 00195-76. Apparaty zashchity bortovyh elektricheskih setey samoletov i vertoletov. Metodika vybora i proverki pravil’nosti ustanovki v sistemah elektrosnabzheniya [Industry standard OST 1 00195-76. Vehicles of protection of side electric networks of airplanes and helicopters. Is there a method of choice and verification of rightness of setting in the systems of electric supply]. Moscow, National Standard of the USSR Publ., 1976. 167 p. (Rus).

Available at: https://files.stroyinf.ru/Index2/1/4293834/4293834330.htm (accessed 10 June 2019). (Rus).

Vlasov G.D. Proektirovanie sistem elektrosnabzheniya letatel’nyh apparatov [Planning of the systems of electric supply of aircrafts]. Moscow, Engineer Publ., 1967. 415 p. (Rus).

Available at: https://en.wikipedia.org/wiki/Fuse_(electrical) (accessed 10 June 2019).

Available at: https://www.compel.ru/lib/na/2014/3/2-klassika-navsegda-sovremennyie-plavkie-predohraniteli-i-derzhateli-razediniteli (accessed 20 July 2019). (Rus).

Baranov M.I., Lysenko V.O. The main characteristics of an electric explosion of a metallic conductor at high impulse currents. Electricity, 2013, no.4, pp.24-30. (Rus).

Published

2020-02-24

How to Cite

Baranov, M. I. (2020). A CHOICE OF ACCEPTABLE SECTIONS OF ELECTRIC WIRES AND CABLES IN ON-BOARD CIRCUITS OF AIRCRAFT ELECTRICAL EQUIPMENT. Electrical Engineering & Electromechanics, (1), 39–46. https://doi.org/10.20998/2074-272X.2020.1.06

Issue

Section

Engineering Electrophysics. High Electric and Magnetic Field Engineering