Investigation of Water Tree Degradation in Dry-cured and Extruded Three-layer (E-E Type) 6.6kV Removed XLPE Cables

2016 ◽  
Vol 136 (3) ◽  
pp. 333-343
Author(s):  
Takashi Kurihara ◽  
Eiji Tsutsui ◽  
Eiji Nakanishi ◽  
Kiyoshi Maki ◽  
Kenichi Murakawa ◽  
...  
Keyword(s):  
Water Tree

Fundamental Study for Locating Water Tree Degradation in XLPE Cables

2015 ◽  
Vol 135 (7) ◽  
pp. 424-430 ◽  
Author(s):  
MyongHwan Kim ◽  
Yoshinobu Murakami ◽  
Masayuki Nagao ◽  
Naohiro Hozumi ◽  
Takashi Kurihara ◽  
...  
Keyword(s):  
Fundamental Study ◽  
Water Tree

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.

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.

scholarly journals A study on the dependence of water tree permittivity with time

2002 ◽  
Author(s):  
I. Radu ◽  
M. Acedo ◽  
P. Notingher ◽  
F. Frutos ◽  
J.C. Filippini
Keyword(s):  
Water Tree

Study on charge dynamics in water-tree XLPE insulation for deterioration diagnosis

2017 ◽  
Author(s):  
Nhet Ra ◽  
Hiroyuki Futami ◽  
Tomohiro Kawashima ◽  
Yoshinobu Murakami ◽  
Naohiro Hozumi ◽  
...  
Keyword(s):  
Charge Dynamics ◽  
Water Tree ◽  
Xlpe Insulation

Study on short time charge behavior in pulsed residual charge method for water tree diagnostics of XLPE cables

2017 ◽  
Author(s):  
Hiroyuki Futami ◽  
Nhet Ra ◽  
Tomohiro Kawashima ◽  
Yoshinobu Murakami ◽  
Naohiro Hozumi ◽  
...  
Keyword(s):  
Residual Charge ◽  
Water Tree ◽  
Short Time

The Effect of Service and Test Conditions on Water Tree Growth in XLPE Cables

1983 ◽  
Vol PER-3 (7) ◽  
pp. 33-33
Author(s):  
Jarle Sletbak ◽  
Erling Ildstad
Keyword(s):  
Tree Growth ◽  
Water Tree ◽  
Test Conditions

scholarly journals Healing of water tree aged cables using rejuvenation nanofluid

2021 ◽  
pp. 107324
Author(s):  
Hao Yuan ◽  
Shakeel Akram ◽  
Kai Zhou ◽  
Pengfei Meng ◽  
Atif Mahmood ◽  
...  
Keyword(s):  
Water Tree
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