Synthesis of constructive-technological decisions of regulation of working capacitance of cables of industrial networks

Abstract

Introduction. Over the past 10 years, the number of industrial networks has more than doubled. At the physical level, all industrial technology networks are based on twisted pair. Purpose. Synthesis of constructive-technological decisions of regulation of electric capacitance of the insulated conductor at a stage of manufacturing of twisted pair of cables of industrial networks. Methodology. The method of secondary charges to determine the capacitance of the insulated conductor by varying the thickness of the solid and foamed polyethylene insulation. Practical value. Effective regulation is provided on the basis of the obtained dependencies of the effective dielectric constant, the tangent of the dielectric loss angle and the capacitance of the insulated conductor on the degree of foaming and the thickness of the protective film of two-layer insulation. At a degree of porosity of 40 %, the dielectric constant decreases by 25 %, the tangent of the dielectric loss angle – by 33 %, the electrical capacitance of the insulated conductor – by 20 %.

Constructing a model of the influence of structural and technological inhomogeneities on electromagnetic energy losses in cables based on a twisted pair

“…The mechanism of influence of foam insulation is an effective factor in regulating the working capacitance. In contrast to [7,9,19], in our research, even in the presence of ellipticity of the shield (b/a=0.70), electromagnetic energy losses are reduced by 14.4 % and 13.5 % in a shielded twisted pair with conductor diameters of 0,64 mm and 0.511 mm, respectively.…”

“…In this sense, the use of insulation with a reduced dielectric constant (ε 2 =1.55) (Tables 1, 2), for example, nitrogen-foamed polyethylene insulation [19], is of particular interest in the shielded design. The mechanism of influence of foam insulation is an effective factor in regulating the working capacitance.…”

“…At the same time, the authors showed [9] that an increase in insulation thickness by 50 % leads to a decrease in capacitance by 20 % with a simultaneous increase in the mass and dimensions of the twisted pair. The use of foam insulation at the technological stage of manufacturing insulated cable conductors is substantiated as an option for overcoming the relevant difficulties in [19]. Despite the practical orientation of such theoretical results, the issue of the influence of insulation foaming on electromagnetic energy losses has not been considered.…”