The aim of this article is to determine whether, in principle, one can use thin insulating layers with increased dielectric permittivity (barriers), located between layers of monolithic insulation, and to evaluate the effectiveness of the above. The tests were conducted using specimens of insulated conducting strands (ICS) of KGE-KhL 3 × 25 + 1 × 6 + 1 × 6 km2 type cable with rubber insulation as well as ICS specimens with a barrier layer. For the main insulator both cases use rubber of type TSShM-38. Internal and external screens were made of conducting rubber of type VEP-30 and the barrier layer consisted of insulating resin filled with TiO2. The dielectric permittivity of the insulating resin TSShM-38 is εi = 3.4 and for the barrier layer rubber it is εb = 9.2. The overall thickness of both specimen types was 4 mm and the length was 2 ± 0.15 m. Our investigations have shown the effectiveness of barriers with increased values of dielectric permittivity in high-voltage cables with the breakdown time probability P(γ) = 0.632 in test ICS specimens increased by more than a factor of 200.
|Number of pages||3|
|Journal||Soviet electrical engineering|
|Publication status||Published - 1989|
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