Effect of silane-grafting on water tree resistance of XLPE cable insulation

2010 ◽  
Vol 115 (6) ◽  
pp. 3168-3176 ◽  
Author(s):  
Zhishen Ma ◽  
Xingyi Huang ◽  
Pingkai Jiang ◽  
Genlin Wang
Keyword(s):  
Cable Insulation ◽  
Xlpe Cable ◽  
Water Tree ◽  
Tree Resistance

Oxidation and Water Tree Formation in Service-Aged XLPE Cable Insulation

1987 ◽  
Vol EI-22 (4) ◽  
pp. 405-412 ◽  
Author(s):  
A. Garton ◽  
S. Bamji ◽  
A. Bulinski ◽  
J. Densley
Keyword(s):  
Cable Insulation ◽  
Xlpe Cable ◽  
Water Tree

scholarly journals Space Charge Behavior in Water Tree Degraded XLPE Cable Insulation

1995 ◽  
Vol 115 (5) ◽  
pp. 411-417 ◽  
Author(s):  
Naohiro Hozumi ◽  
Tatsuki Okamoto ◽  
Yasuyuki Ikeda
Keyword(s):  
Space Charge ◽  
Cable Insulation ◽  
Xlpe Cable ◽  
Water Tree

The effect of accelerated water tree ageing on the properties of XLPE cable insulation

2011 ◽  
Vol 18 (5) ◽  
pp. 1562-1569 ◽  
Author(s):  
Jianying Li ◽  
Xuetong Zhao ◽  
Guilai Yin ◽  
Shengtao Li ◽  
Jiankang Zhao ◽  
...  
Keyword(s):  
Cable Insulation ◽  
Xlpe Cable ◽  
Water Tree

Experimental investigation on the cause of harmfulness of the blue water tree to XLPE cable insulation

1999 ◽  
Vol 6 (6) ◽  
pp. 887-891 ◽  
Author(s):  
G. Katsuta ◽  
A. Toya ◽  
Ying Li ◽  
M. Okashita ◽  
F. Aida ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Blue Water ◽  
Cable Insulation ◽  
Xlpe Cable ◽  
Water Tree

scholarly journals Influence of DC Stress Superimposed with High Frequency AC on Water Tree Growth in XLPE Insulation

2018 ◽  
Author(s):  
Frank Mauseth ◽  
Sverre Hvidsten ◽  
Hans-Helmer Sæternes ◽  
Jørund Aakervik
Keyword(s):  
Tree Growth ◽  
Cable Insulation ◽  
Dc Voltage ◽  
Xlpe Cable ◽  
Water Tree ◽  
Voltage Stress ◽  
Insulation Thickness ◽  
High Frequency Ac ◽  
Test Objects ◽  
Dc Stress

<p>Power electronics used for HVDC converters will stress cable insulation with a DC voltage with superimposed transients. The effect these transients have on the performance of the polymeric cable insulation is yet not clear. The main purpose of this work has been to investigate the effect of such transients on XLPE cable insulation when exposed to moisture. </p><p>Laboratory experiments were performed on Rogowski shaped test objects with an insulation thickness of 1.3 mm. At one of the semi-conductors, 20 sodium chloride (NaCl) particles were placed in order to facilitate initiation of vented water trees. The test objects were conditioned with water at 20 °C for two months ensuring saturation of water inside the insulation system before testing.<br />The test objects were aged with an AC voltage simulating the transients from a HVDC converter. Experiments were performed using the AC voltage with and without DC stress to investigate the influence of the DC level on the water tree growth. The ageing was done at 30 °C.</p><p>Test objects were taken out and inspected for water tree growth regularly. The results show a rapid ageing caused by water treeing when exposed to the DC voltage overlaid AC voltage with a frequency of 5 kHz and a pure AC voltage stress.</p>

scholarly journals Water-Tree Resistant Characteristics of Crosslinker-Modified-SiO2/XLPE Nanocomposites

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1398
Author(s):  
Yong-Qi Zhang ◽  
Xuan Wang ◽  
Ping-Lan Yu ◽  
Wei-Feng Sun
Keyword(s):  
Electric Fields ◽  
Tree Growth ◽  
Mechanical Analysis ◽  
Water Molecules ◽  
Crosslinking Degree ◽  
Water Tree ◽  
Tree Resistance ◽  
Alternating Electric Fields ◽  
Trimethylolpropane Triacrylate ◽  
Mechanical Performances

Trimethylolpropane triacrylate (TMPTA) as a photoactive crosslinker is grafted onto hydrophobic nanosilica surface through click chemical reactions of mercapto double bonds to prepare the functionalized nanoparticles (TMPTA-s-SiO2), which are used to develop TMPTA-s-SiO2/XLPE nanocomposites with improvements in mechanical strength and electrical resistance. The expedited aging experiments of water-tree growth are performed with a water-knife electrode and analyzed in consistence with the mechanical performances evaluated by means of dynamic thermo-mechanical analysis (DMA) and tensile stress–strain characteristics. Due to the dense cross-linking network of polyethylene molecular chains formed on the TMPTA-modified surfaces of SiO2 nanofillers, TMPTA-s-SiO2 nanofillers are chemically introduced into XLPE matrix to acquire higher crosslinking degree and connection strength in the amorphous regions between polyethylene lamellae, accounting for the higher water-tree resistance and ameliorated mechanical performances, compared with pure XLPE and neat-SiO2/XLPE nanocomposite. Hydrophilic TMPTA molecules grafted on the nano-SiO2 surface can inhibit the condensation of water molecules into water micro-beads at insulation defects, thus attenuating the damage of water micro-beads to polyethylene configurations under alternating electric fields and thus restricting water-tree growth in amorphous regions. The intensified interfaces between TMPTA-s-SiO2 nanofillers and XLPE matrix limit the segment motions of polyethylene molecular chains and resist the diffusion of water molecules in XLPE amorphous regions, which further contributes to the excellent water-tree resistance of TMPTA-s-SiO2/XLPE nanocomposites.

Ageing Assessment of XLPE Cable Insulation by Residual Antioxidant Content

2020 ◽  
Vol 27 (6) ◽  
pp. 1795-1802
Author(s):  
Yuanyuan Zhang ◽  
Shengtao Li ◽  
Jian Gao ◽  
Shihang Wang ◽  
Kangning Wu ◽  
...  
Keyword(s):  
Cable Insulation ◽  
Xlpe Cable ◽  
Antioxidant Content

scholarly journals Polyethylene Nanocomposites for Power Cable Insulations

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 24 ◽  
Author(s):  
Ilona Pleşa ◽  
Petru Noţingher ◽  
Cristina Stancu ◽  
Frank Wiesbrock ◽  
Sandra Schlögl
Keyword(s):  
Electrical Performance ◽  
Power Cable ◽  
Power Cables ◽  
Structure Property ◽  
Thermoplastic Polymers ◽  
Water Tree ◽  
Tree Resistance ◽  
Structure Property Relationships ◽  
Aging Mechanisms ◽  
Comprehensive Study

This review represents a comprehensive study of nanocomposites for power cables insulations based on thermoplastic polymers such as polyethylene congeners like LDPE, HDPE and XLPE, which is complemented by original results. Particular focus lies on the structure-property relationships of nanocomposites and the materials’ design with the corresponding electrical properties. The critical factors, which contribute to the degradation or improvement of the electrical performance of such cable insulations, are discussed in detail; in particular, properties such as electrical conductivity, relative permittivity, dielectric losses, partial discharges, space charge, electrical and water tree resistance behavior and electric breakdown of such nanocomposites based on thermoplastic polymers are described and referred to the composites’ structures. This review is motivated by the fact that the development of polymer nanocomposites for power cables insulation is based on understanding more closely the aging mechanisms and the behavior of nanocomposites under operating stresses.

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