Deep trap sites suppressing space charge injection in polycyclic aromatic compounds doped XLPE composite

• Published in: IET Nanodielectrics Vol. 3; no. 1; pp. 10 - 13
• Main Authors: Li, Jin, Han, Chenlei, Du, Boxue, Takada, Tatsuo
• Format: Journal Article
• Language: English
• Published: Beijing The Institution of Engineering and Technology 01.03.2020; John Wiley & Sons, Inc; Wiley
• Subjects: 3D potential distributions; Aromatic compounds; Cables; Carrier density; Carrier traps; Charge injection; Chemical compounds; Cross-linked polyethylene; cross-linked polyethylene composite; Current carriers; deep carrier traps; deep trap sites; Density functional theory; Deodorants; Depolarization; Electric fields; Energy; Energy levels; integration current method; Nanocomposites; Nanoparticles; polycyclic aromatic compounds; Polyethylene; quantum chemical calculation; Quantum chemistry; Space charge; space charge behaviours; space charge characteristics; space charge injection; space charge suppression; temperature 25.0 degC; temperature 80.0 degC; XLPE composite; XLPE insulation; energy levels; temperature 80.0 degC; quantum chemical calculation; deep carrier traps; space charge characteristics; 3D potential distributions; XLPE insulation; deep trap sites; polycyclic aromatic compounds; charge injection; integration current method; space charge suppression; temperature 25.0 degC; space charge; density functional theory; XLPE composite; space charge behaviours; cross-linked polyethylene composite; space charge injection
• ISSN: 2514-3255; 2514-3255
• DOI: 10.1049/iet-nde.2019.0035

In this study, the space charge characteristics in the polycyclic aromatic compounds doped cross-linked polyethylene (XLPE) composite were analysed by integration current (Q(t)) method and quantum chemical calculation. Experimentally, the space charge behaviours of XLPE composites modified by the three selected polycyclic aromatic compounds during polarisation and depolarisation process at 25 and 80°C were measured by Q(t) method, respectively. The energy levels and 3D potential distributions of the three polycyclic aromatic compounds were calculated by density functional theory. The experimental and calculation results indicate that the polycyclic aromatic compound C with deep carrier traps and stronger polarity exhibits outstanding ability to reduce space charge injection than the others at both 25 and 80°C. Generally, 4,4′-bis (dimethyl amino) benyil has great potential as the organic additive for DC cable insulation from the view of space charge suppression.