Keywords
low molecular weight substances
probing electric field
dielectric loss багатожильні кабелі атомних електричних станцій
низькомолекулярні речовини
зондувальне електричне поле
тангенс кута діелектричних втрат
How to Cite
Abstract
A model of the piece-wise homogeneous inter-phase space of multi-core cables is proposed, taking into account the influence of cracks oriented along the electric field lines. The cracks are filled with low molecular weight substances. The case of tangential incidence of the probing field is considered. The equivalent values of the tangent of the dielectric loss angle at various parameters of low molecular weight substances in the cracks of the polyethylene insulation of the conductor with a cross section of 2.5 mm2 were determined. The equivalent tangent of the angle of dielectric loss increases by (3-20) times when the dissipation of electrical energy by low molecular weight substances changes from 10% to 100% in a crack, which is 1% of the thickness of an intact section of polyethylene insulation. The electric field distribution is obtained for the more general case of accumulation of low molecular weight products in capillaries formed by the contact line of insulated conductors. Differences experimentally observed in the value of tgδ with different schemes of examination of multi-core cables are related, to a greater extent, to the uneven distribution of energy-dissipating substances over the cable cross-section, and not to a change in the structure of the probing electric field. References 11, figure 5.
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