Behavior of high‐voltage gaps in the presence of large space‐charge fields

1985 ◽  
Vol 58 (4) ◽  
pp. 1460-1465 ◽  
Author(s):  
M. Friedman ◽  
V. Serlin
Keyword(s):  
Space Charge ◽  
High Voltage ◽  
Large Space

Space charge phenomena in oil-paper insulation materials under high voltage direct current

2009 ◽  
Vol 67 (2-3) ◽  
pp. 417-421 ◽  
Author(s):  
Yuanxiang Zhou ◽  
Yunshan Wang ◽  
Guangfan Li ◽  
Ninghua Wang ◽  
Yingyan Liu ◽  
...  
Keyword(s):  
Space Charge ◽  
High Voltage ◽  
Direct Current ◽  
Insulation Materials ◽  
High Voltage Direct Current ◽  
Paper Insulation

scholarly journals Evaluation of graphene/crosslinked polyethylene for potential high voltage direct current cable insulation applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yuan Li ◽  
Guangya Zhu ◽  
Kai Zhou ◽  
Pengfei Meng ◽  
Guodong Wang
Keyword(s):  
Space Charge ◽  
High Voltage ◽  
Direct Current ◽  
Tensile Yield Strength ◽  
Scanning Calorimetry ◽  
Crosslinking Degree ◽  
High Voltage Direct Current ◽  
Water Tree ◽  
Mechanical And Electrical Properties ◽  
Aging Test

AbstractThis paper evaluates the potential usage of graphene/crosslinked polyethylene (graphene/XLPE) as the insulating material for high voltage direct current (HVDC) cables. Thermal, mechanical and electrical properties of blends with/without graphene were evaluated by differential scanning calorimetry (DSC), tensile strength, DC conductivity, space charge measurements and water tree aging test. The results indicate that 0.007–0.008% weight amount of graphene can improve the mechanical and electrical insulation properties of XLPE blends, namely higher tensile/yield strength, improved space charge distribution, and shorter/fewer water tree branches. The improvements mainly attribute to the high stiffness of graphene, deep traps introduced by the interaction zones of graphene and XLPE, and the blockage effect of graphene within XLPE. For thermal performance of XLPE blends, graphene nano-fillers have but limited improvement. The crystallinity of the blends barely changes with the addition of graphene. However, the crosslinking degree increases as the additive-like amounts of graphene doped. The above findings provide a guide for tailoring lightweight XLPE materials with excellent mechanical and electrical performances by doping them with a small amount of graphene.

New Method for Synthesis of Hard Coatings Using Pulsed Bombardment with High-Energy Gas Atoms

2016 ◽  
Vol 876 ◽  
pp. 14-24
Author(s):  
Abdumalik Rakhimovich Seitkulov ◽  
Sergey Nikolaevich Grigoriev ◽  
Alexander Sergeevich Metel ◽  
Marina Aleksandrovna Volosova ◽  
Yury Andreevich Melnik
Keyword(s):  
Surface Layer ◽  
Space Charge ◽  
Charge Exchange ◽  
High Voltage ◽  
Discharge Plasma ◽  
High Energy ◽  
Hard Coatings ◽  
Magnetron Discharge ◽  
Metal Atoms ◽  
Pass Through

For deposition of hard coatings is used a source of metal atoms accompanied by high-energy gas atoms. The metal atoms are produced due to sputtering a flat rectangular target in low pressure magnetron discharge. The gas atoms with energy up to 30 keV are produced due to charge exchange collisions of accelerated ions in space charge sheaths near the surfaces of a grid parallel to the target. The ions are extracted from the discharge plasma and accelerated by high-voltage pulses applied to the grid. The metal atoms pass through the grid and deposit on the products. Conjunction of their trajectories with those of gas atoms bombarding the growing coating allows synthesis of the coatings on rotating dielectric products. Mixing by high-energy gas atoms of the coating atoms and atoms of the product material in its surface layer improves the coating adhesion.

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