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

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

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

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

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>

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

Effect of Electrical Aging on the Trap Parameter of HVAC XLPE Cable Insulation

2014 ◽  
Vol 672-674 ◽  
pp. 769-772
Author(s):  
Wei Wei Li ◽  
Qiang Shi ◽  
Chi Wu
Keyword(s):  
Crystallization Process ◽  
Melt Crystallization ◽  
Depolarization Current ◽  
Cable Insulation ◽  
Trap Charge ◽  
Xlpe Cable ◽  
Trap Parameter ◽  
Start Up ◽  
Electrical Aging ◽  
Two Peaks

The effect of electrical aging on the trap parameter of HVAC XLPE cable insulation was investigated in this work. Thermally Stimulated Current (TSC) was used to measure depolarization current. The variation of trap parameter was calculated by means of start-up method based on the Gaussian fitting curve of TSC data. It was found that, the activation energy and the amount of trap charge obtained from TSC peak at 243K and 348K were increased after electrical aging, which may be benefit to characterize the degree of aging. The amount of trap charge in the two peaks increases as the increase of oxide dipole after electrical aging. And charge trapped described by the TSC peak at melting temperature increased after aging. It is considered that the increase of charge in the TSC peak can be attributed to the release of trap charge in the melt crystallization process, which corresponds to the α relaxation process in XLPE insulation.

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