Design of inner cone pluggable intermediate quick joint for 110 kV XLPE cables based on GIS

作者：Fan Youping^*; Wu Lihui; Kang Liyi; Bie Rui; Chen Jie

来源：High Voltage Engineering, 2016, 42(2): 485-495.

DOI：10.13336/j.1003-6520.hve.2016.02.020

• Dielectric coefficient
• Electric field simulation
• Electrical conductivity
• Electrical parameter
• High voltage
• High voltage power cables
• Power cables
• Rapid rejuvenation

The rapid repair of faulted high-voltage XLPE power cable has become an urgent issue. To shorten the time of high-voltage power cables rejuvenation and save the cost of device, the gas switch gear (GIS) technology of cable terminal was applied to design intermediate joints for temporary cable connection when 110 kV XLPE cable or cable joints are in occurrence of insulation fault. Using a finite element model, we analyzed the stress cone, high voltage shielded electrode, and electrical parameter coordination, and obtained their optimized values accordingly. A sample joint was completed based on these parameters and tested by field experiments. The results show that the optimal values of axial length and edge radius of stress cone are 135 mm and 25 mm, respectively. Decreasing dielectric coefficient ratio of the stress cone to the shielding layer of semiconductor, as well as decreasing electrical conductivity ratio of the stress cone to the main insulation, is beneficial to the joint. The optimal values of fillet radius and electrode length are 10 mm and 40 mm, respectively. By using the proposed joint, the rejuvenation time of cable accessories was shortened to less than 4 hours. The cable joint with reduced cable butt can be realized, showing a strong versatility and re-usability of main portion of joint, which meets the operation requirements of system.

• 出版日期2016