Influence of Composite Insulation Interface Defect Types and Position on Electric Field Distribution of Distribution Cable Accessories
Li Guochang1, Liang Xiaojian1, Wei Yanhui1, Su Guoqiang2, Lei Qingquan1
1. Institute of Advanced Electrical Materials Qingdao University of Science and Technology Qingdao 266042 China; 2. Electric Power Research Institute of State Grid Shandong Electric Power Company Jinan 250002 China
Abstract Distribution cable accessory is the key component of distribution network system, and its composite insulation XLPE/SIR interface is the weakest insulation position. In this study, the typical defects that occur during the installation and operation of cable accessories has been simulated, seven kinds of interface defects, such as bubbles, air gap, water droplets, water film, metal impurity, semi-conductive impurity and insulation impurity, were designed at the interface of composite insulation XLPE/SIR of cable accessories, the internal electric field distortion law of cable accessories with typical defects is studied by establishing the electric field simulation model of interface defects of distribution cable accessories. The simulation results show that the maximum field distortion caused by bubble defect and air gap defect at the interface is 13kV/mm and 4.58kV/mm, respectively. With the increase of bubble defect size, the electric field distortion increases slightly. The maximum electric field distortion caused by water drop defect and water film defect is 2.94kV/mm and 3.74kV/mm, respectively. With the increase of defect size, the electric field distortion becomes more serious. When the defect size is doubled, the maximum electric field distortion caused by water droplets and film increases by 18.7% and 16%, respectively. As the defect moves away from the root of the stress cone, the electric field distortion caused by metal defects and semi-conductive defects increases first and then decreases, the maximum distortion electric field appears at about 2mm away from the stress cone, which is about 3.65kV/mm. In contrast, the maximum electric field distortion caused by insulation defects occurred at the root of the stress cone, which was about 8.74kV/mm, and with the defect away from the root of the stress cone, the electric field distortion shows an obvious downward trend. This work has important guiding significance for fault analysis and operation maintenance of cable accessories of distribution network.
Li Guochang,Liang Xiaojian,Wei Yanhui等. Influence of Composite Insulation Interface Defect Types and Position on Electric Field Distribution of Distribution Cable Accessories[J]. Transactions of China Electrotechnical Society, 2022, 37(11): 2707-2715.
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2022, Vol. 37 
