Transient current measurement for the detection of water tree growth in polymeric power cables

1995 ◽  
Vol 2 (5) ◽  
pp. 866-874 ◽  
Author(s):  
H.M. Li ◽  
R.A. Fouracre ◽  
B.H. Crichton
Keyword(s):  
Tree Growth ◽  
Current Measurement ◽  
Transient Current ◽  
Power Cables ◽  
Water Tree

scholarly journals Diagnostic comparison of water tree growth in XLPE insulated power cables produced in GCC countries

2008 ◽  
Vol 6 (6) ◽  
pp. 1-11
Author(s):  
A. Al-Arainy ◽  
M. Qureshi ◽  
N. Malik ◽  
M. Saati ◽  
O. Al-Nather ◽  
...  
Keyword(s):  
Tree Growth ◽  
Power Cables ◽  
Water Tree ◽  
Gcc Countries

scholarly journals Water Diffusion Barrier – A Novel Design for High Voltage Subsea Cables

2018 ◽  
Author(s):  
Knut Magne Furuheim ◽  
Susanne Nilsson ◽  
Sverre Hvidsten ◽  
Svein Magne Hellesø
Keyword(s):  
High Voltage ◽  
Tree Growth ◽  
Main Concern ◽  
Power Cables ◽  
Formation Water ◽  
Water Ingress ◽  
Water Barrier ◽  
Water Tree ◽  
Novel Design ◽  
Measured Water

<p>High voltage subsea cables are normally sheathed with a metallic water barrier at voltage levels above 36 kV as recommended by the standards (IEC 60840). The main concern with water ingress in power cables is the risk of water tree formation. Water tree growth will reduce the lifetime of power cables. For dynamic cable designs there are today few reliable alternatives to prevent the water ingress. Here a novel electrical semi-conductive water barrier is presented, based on a multilayer polymer sheath design where the arrangement of layers is based on numerical simulations using measured water transport data.</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.

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.

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

Coaxial shunt intended for transient current measurement in a pseudospark switch

1996 ◽  
Vol 143 (2) ◽  
pp. 119-124 ◽  
Author(s):  
P. Moran ◽  
G. Jean Francois ◽  
A. Gibert ◽  
P. Pignolet
Keyword(s):  
Current Measurement ◽  
Transient Current
Sign in / Sign up

Export Citation Format

Share Document