Location of water tree degraded point along XLPE cable line using DC voltage

2008 ◽  
Author(s):  
Kiyoka ◽  
Katsumi Uchida ◽  
Naohiro Hozumi
Keyword(s):  
Cable Line ◽  
Dc Voltage ◽  
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>

DC Voltage and AC Voltage Characteristics of Current Flowing in Water Tree Degraded XLPE Cable

2018 ◽  
Vol 138 (9) ◽  
pp. 463-470
Author(s):  
Hiroaki Kamohara ◽  
Yoshinori Kudo ◽  
Yoshiyasu Ehara
Keyword(s):  
Dc Voltage ◽  
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

scholarly journals Direct-detect Type Residual Charge Method with Short-term Voltage Up-down for Water Tree Deterioration Diagnosis in XLPE Cable

2006 ◽  
Vol 126 (4) ◽  
pp. 452-459 ◽  
Author(s):  
Iwao Ootaka ◽  
Masaru Aoki ◽  
Hirotaka Togashi ◽  
Tomiyuki Tsujimoto ◽  
Masahiko Nakade
Keyword(s):  
Short Term ◽  
Xlpe Cable ◽  
Residual Charge ◽  
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

Development of New Water Tree Suppressive XLPE Cable

1986 ◽  
Vol 1 (1) ◽  
pp. 27-33 ◽  
Author(s):  
Kiyoshi Watanabe ◽  
Hideki Yagyu ◽  
Yasuo Sekii ◽  
Moritada Marumo
Keyword(s):  
Xlpe Cable ◽  
Water Tree
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