scholarly journals Influence of bubbles on electric field distribution of butt‐gaps in superconducting cable insulation layer

2021 ◽  
Author(s):  
Jiahui Zhang ◽  
Peng Xue ◽  
Bin Xiang ◽  
Lei Gao ◽  
Xiaohua Jiang
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Insulation Layer ◽  
Cable Insulation

Inhibiting Effect of Nonlinear Shielding Layer on Electrical Tree Propagation inside Insulation Layer of High-Voltage Cable

2014 ◽  
Vol 989-994 ◽  
pp. 1273-1277
Author(s):  
Chang Ming Li ◽  
Bao Zhong Han ◽  
Long Zhao ◽  
Chun Peng Yin
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
High Voltage ◽  
Electric Field Distribution ◽  
Uniform Electric Field ◽  
Insulation Layer ◽  
Breakdown Time ◽  
Electrical Tree ◽  
Traditional Structure ◽  
Initiation And Propagation

Nonlinear insulated materials can uniform electric field distribution in non-uniform electric field. In order to inhibit the electric tree initiation and propagation inside high-voltage cross-linked polyethylene (XLPE) insulated cable, a kind of 220kV high-voltage XLPE insulated cable with new structure is designed by embedding nonlinear shielding layer into XLPE insulation layer of high-voltage cable with traditional structure in this study. Experimental and simulation results indicate that the nonlinear shielding layer can effectively inhibit electrical tree propagation inside the XLPE specimens, and obviously extend the breakdown time caused by electric tree propagation. When the electrical tree propagates into the nonlinear shielding layer sandwiched between insulation layers of cable, the electric field distribution near the tip of electrical tree is obviously improved. These findings prove the feasibility and the effectivity of inhibiting electrical tree propagation inside high-voltage cable by adding nonlinear shielding layer into the insulation layer.

Electric field distribution based on radial nonuniform conductivity in HVDC XLPE cable insulation

2020 ◽  
Vol 27 (1) ◽  
pp. 121-127 ◽  
Author(s):  
Haiyang Ren ◽  
Lisheng Zhong ◽  
Xiaoyu Yang ◽  
Wenpeng Li ◽  
Jinghui Gao ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Cable Insulation ◽  
Xlpe Cable

scholarly journals Analysis of electric field distribution of cable insulation defects

2018 ◽  
Vol 1087 ◽  
pp. 042040
Author(s):  
Jiaguo Liu ◽  
Xin Xin ◽  
Yunxing Gao ◽  
Xinlong Yu ◽  
Zebing Li ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Cable Insulation

scholarly journals Electric Field Distribution in HVDC Cable Joint in Non-Stationary Conditions

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5401
Author(s):  
Thi Thu Nga Vu ◽  
Gilbert Teyssedre ◽  
Séverine Le Roy
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Material Properties ◽  
Electric Field Distribution ◽  
Thermal Conditions ◽  
Axial Component ◽  
Cable Insulation ◽  
Tangential Field ◽  
Stationary Conditions ◽  
Physical Phenomena

Accessories such as joints and terminations represent weak points in HVDC cable systems. The DC field distribution is intimately dependent on the thermal conditions of the accessory and on material properties. Moreover, there is no available method to probe charge distribution in these conditions. In this work, the field distribution in non-stationary conditions, both thermally and electrically, is computed considering crosslinked polyethylene (XLPE) as cable insulation and different insulating materials (silicone, rubber, XLPE) for a 200 kV joint assembled in a same geometry. In the conditions used, i.e., temperatures up to 70 °C, and with the material properties considered, the dielectric time constant appears of the same order or longer than the thermal one and is of several hours. This indicates that both physical phenomena need to be considered for modelling the electric field distribution. Both the radial and the tangential field distributions are analysed, and focus is given on the field distribution under the stress cone on the ground side and near the central deflector on the high voltage side of the joint. We show that the position of the maximum field varies in time in a way that is not easy to anticipate. Under the cone, the smallest tangential field is obtained with the joint insulating material having the highest electrical conductivity. This results from a shift of the field towards the cable insulation in which the geometrical features produce a weaker axial component of the field. At the level of the central deflector, it is clear that the tangential field is higher when the mismatch between the conductivity of the two insulations is larger. In addition, the field grows as a function of time under stress. This work shows the need of precise data on materials conductivity and the need of probing field distribution in 3D.

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