ЧИННИКИ НАДІЙНОЇ ЕКСПЛУАТАЦІЇ СУЧАСНИХ СИЛОВИХ КАБЕЛІВ ІЗ ТВЕРДОЮ ІЗОЛЯЦІЄЮ

Abstract

The paper presents a review and analyzes of the principal factors for reliable operation of the power cables with polymer insulation. The basic conditions for long-term operation of the insulation, typical defects in its structure and the causes of their occurrence, which eventually lead to insulation failure, are defined and summarized. According to scientific data, the influence of different electrical modes of the cable operation on cable line service is described, the effects of the higher harmonics, asymmetry and non-sinusoidal voltage on the state of the insulation, its accelerated aging, the increase in cable temperature, and therefore the need to correct the current loading are studied. Such impacts can cause the risk of failure of the cables, their operation and the breakdowns of the electrical network as well as additional economic costs. The new intelligent systems for on-line control of electrical, thermal and mechanical characteristics and partial discharges in power cable lines are presented. These systems are intended to control automatically the insulation state and cable line operation, to protect power cable lines against emergency situations. Ref. 53, fig. 3, tables 2.

Keywords

• power cables
• cable lines
• cross-linked polyethylene insulation
• insulation aging
• higher harmonics
• asymmetry
• non-sinusoidal voltage
• partial discharges
• temperature
• current loading
• monitoring of technical state