THE EVALUATION OF POSSIBILITY OF NORMAL OPERATION OF CABLES BASED ON TWISTED PAIRS WITH PVC JACKET UNDER THE CONDITIONS OF HIGH HUMIDITY AND TEMPERATURE

Authors

  • G. V. Bezprozvannych National Technical University "Kharkiv Polytechnic Institute", Ukraine https://orcid.org/0000-0002-9584-3611
  • I. A. Mirchuk Private Joint Stock Company «Ukraine Scientific-Research Institute of Cable Industry», Ukraine

DOI:

https://doi.org/10.20998/2074-272X.2017.5.08

Keywords:

cables based on twisted pairs for shipbuilding, accelerated aging, hygroscopic moistening, thermal aging, partial capacitance, tangent of the dielectric loss angle, service life

Abstract

Introduction. Development of cables for structured cabling systems based on twisted pairs for shipbuilding is carried out in two main directions: increasing the fire safety of cables and increasing the long-term permissible operating temperature by using new, more heat-resistant, electrical insulating materials. Purpose. Substantiation of the possibility of unshielded cables on the basis of unshielded twisted pairs with thermoplastic polyethylene insulation in PVC protective jacket in conditions of high humidity and high operating temperatures on the basis of the results of accelerated aging. Methodology. The cycle of aging under conditions of increased humidity is performed for 336 hours. Then the sample was under natural drying conditions for 1440 hours. Thermal aging in a thermostat at 90 °C was carried out in two stages: first – for 206 hours, the second – for 260 hours. In the initial state and after accelerated aging, measurements of the capacitance and tangent of the dielectric loss angle of all the insulating gaps at frequencies of 100 Hz, 1 and 10 kHz were performed. Results. According to the results of accelerated aging under conditions of high humidity and temperature, it is established that the design of an unshielded cable based on unshielded twisted pairs with thermoplastic polyethylene insulation in a protective coating based on PVC-plastic is resistant to external influencing factors. Practical value. The prolonged holding at temperature of 90 °C is equivalent to operation at temperature of 40 °C for 6.8 years. At higher operating temperatures, the lifetime of the cable is significantly reduced.

References

1. IEC 60092-359:2014, Electrical Installations In Ships – Part 359: Sheathing Materials For Shipboard Power And Telecommunication Cables By IEC TC/SC 18A. 50 p.

2. IEC 60332-1-2:2004, Tests on electric cables under fire conditions – Part 1: Test on a single vertical insulated wire or cable.

3. Bezprozvannych G.V., Nabokа B.G., Morozova E.V. Radiating resistance of common commercial cables of internal laying. Electrical engineering & electromechanics, 2006, no.3, pp. 82-86. doi: 10.20998/2074-272X.2006.3.16. (Rus).

4. Bezprozvannych A.V., Naboka B.G., Moskvitin E.S. Examination of the three-phase insulation of cables in a metal shell. Electricity, 2010, no.1, pp. 48-54. (Rus).

5. Bezprozvannych A.V. The electrical scanning of the transverse structure by multicore cables by the method of cumulative measurements. Tekhnichna elektrodynamika, 2008, no.3, pp. 30-36. (Rus).

Published

2017-10-21

How to Cite

Bezprozvannych, G. V., & Mirchuk, I. A. (2017). THE EVALUATION OF POSSIBILITY OF NORMAL OPERATION OF CABLES BASED ON TWISTED PAIRS WITH PVC JACKET UNDER THE CONDITIONS OF HIGH HUMIDITY AND TEMPERATURE. Electrical Engineering & Electromechanics, (5), 51–54. https://doi.org/10.20998/2074-272X.2017.5.08

Issue

Section

Engineering Electrophysics. High Electric and Magnetic Field Engineering

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