Space Charge Accumulation Mechanism Near the Stress Cone of Cable Accessories Under Electrical-Thermal Aging
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ORIGINAL ARTICLE
Space Charge Accumulation Mechanism Near the Stress Cone of Cable Accessories Under Electrical‑Thermal Aging Dongxin He1 · Wenjie Gong1 · Tao Zhang1 · Wei Wang2 · Xiaoran Wang1 · Qingquan Li1 Received: 29 September 2019 / Revised: 17 July 2020 / Accepted: 15 September 2020 © The Korean Institute of Electrical Engineers 2020
Abstract Due to the complicated structure composed of different kinds of materials, space charges tend to accumulate within cable accessories, which easily leads to the electrical breakdown. To obtain insights into the space charge accumulation in cable accessories, accelerated aging was performed for 10 kV crosslinked polyethylene (XLPE) insulated cable samples with stress cones, under an AC voltage of 26.1 kV and temperatures of 103 °C and 114 °C. The space charge distribution in the cable insulation was tested at different aging stages. The results show that space charge accumulates in the insulation covered by the stress cones, and the charge density and coaxial distribution region increase during aging. Together with the results for the charge measurement on peeled cable samples, it is concluded that charge accumulation is related to the semiconductor used in the stress cones. It is difficult for the space charge generated in the cable insulation to escape through the silicone rubber-based (SR-based) semiconductor in the stress cones, as the ability of this material to conduct charges is lower than that of a cable-shielding ethylene–vinyl acetate-based (EVA-based) semiconductor; therefore, the space charge accumulates near the outer part of the insulation. This research provides insights into the important function of semiconductor on charge accumulation in cable accessories, which will aid in research on optimizing and prolonging the lifetime of cable accessories. Keywords Space charge · Cable accessory · Charge accumulation · Electrical-thermal aging
1 Introduction Electric power cables are widely employed worldwide, and reliability of the cables is vital for the safety of the entire power system. Cable accessories, including the cable terminal and cable joint, are the weak components of a cable system, as they are more likely to break down than cable lines due to their complex structure [1]. The primary part of a cable accessory is the stress cone, whose function is to ensure uniformity of the electric field. There are several parts of different materials around the stress cone in a cable accessary, including a reinforced insulation silicone rubber (SR), stress cone SR-based semiconductor, cable insulation * Dongxin He [email protected] 1
Shandong Provincial Key laboratory of UHV Transmission Technology and Equipment, School of Electrical Engineering, Shandong University, Jinan 250061, China
Beijing Key Laboratory of High Voltage and Electromagnetic Compatibility, North China Electric Power University, Beijing 102206, China
2
crosslinked polyethylene (XLPE), and cable conductor shield ethylene–vinyl acetate copolymer based semiconductor (EVA-based semiconduc
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