Toward understanding the characteristics of water tree propagation under DC voltage polarities

2016 ◽  
Author(s):  
Kai Zhou ◽  
Tianhua Li ◽  
Kangle Li ◽  
Mingliang Yang ◽  
Ming Huang
Keyword(s):  
Dc Voltage ◽  
Water Tree

Water Tree Growth in Polyethylene under DC Voltage Stress

1977 ◽  
Vol EI-12 (3) ◽  
pp. 218-223 ◽  
Author(s):  
E. A. Franke ◽  
J. R. Stauffer ◽  
E. Czekaj
Keyword(s):  
Tree Growth ◽  
Dc Voltage ◽  
Water Tree ◽  
Voltage Stress

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

A DC Voltage Estimations at the Maximum Power Point of a PV System with Partial Shade

2015 ◽  
Vol 135 (12) ◽  
pp. 1463-1469
Author(s):  
Atsushi Nakata ◽  
Akihiro Torii ◽  
Jun Ishikawa ◽  
Suguru Mototani ◽  
Kae Doki ◽  
...  
Keyword(s):  
Maximum Power ◽  
Pv System ◽  
Maximum Power Point ◽  
Dc Voltage ◽  
Partial Shade ◽  
Power Point

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
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