Study on space charge behavior of XLPE after long-term aging under temperature gradient and DC stress

2016 ◽  
Author(s):  
Xia Wang ◽  
Quanyu Liu ◽  
Xiaoyang Zhang ◽  
Kai Wu ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Space Charge ◽  
Dc Stress

Space charge measurement in LPDE films under temperature gradient and DC stress

2010 ◽  
Vol 17 (6) ◽  
pp. 1796-1805 ◽  
Author(s):  
X. Chen ◽  
X. Wang ◽  
K. Wu ◽  
Z. Peng ◽  
Y. Cheng ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Space Charge ◽  
Charge Measurement ◽  
Dc Stress

Field distribution in polymeric MV-HVDC model cable under temperature gradient. Simulation and space charge measurements

2014 ◽  
Vol 17 (5-6) ◽  
pp. 307-325 ◽  
Author(s):  
Thi Thu Nga Vu ◽  
Gilbert Teyssedre ◽  
Bertrand Vissouvandin ◽  
Séverine Le Roy ◽  
Christian Laurent ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Space Charge ◽  
Field Distribution

Space charge characteristics in 160 kV DC XLPE cable under temperature gradient

2018 ◽  
Vol 25 (6) ◽  
pp. 2366-2374 ◽  
Author(s):  
Wang Xia ◽  
Chen Chi ◽  
Cheng Chuanhui ◽  
Wu Yang ◽  
Wu Kai ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Space Charge ◽  
Xlpe Cable

scholarly journals Different Growth and Sporulation Responses to Temperature Gradient among Obligate Apomictic Strains of Ulva prolifera

Plants ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2256
Author(s):  
Yoichi Sato ◽  
Yutaro Kinoshita ◽  
Miho Mogamiya ◽  
Eri Inomata ◽  
Masakazu Hoshino ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Carbon Content ◽  
Nitrogen Content ◽  
Environmental Conditions ◽  
Genetic Stability ◽  
Ulva Prolifera ◽  
Market Demand ◽  
Gene Sequences ◽  
Site Specific

The green macroalga Ulva prolifera has a number of variants, some of which are asexual (independent from sexual variants). Although it has been harvested for food, the yield is decreasing. To meet market demand, developing elite cultivars is required. The present study investigated the genetic stability of asexual variants, genotype (hsp90 gene sequences) and phenotype variations across a temperature gradient (10–30 °C) in an apomictic population. Asexual variants were collected from six localities in Japan and were isolated as an unialgal strain. The hsp90 gene sequences of six strains were different and each strain included multiple distinct alleles, suggesting that the strains were diploid and heterozygous. The responses of growth and sporulation versus temperature differed among strains. Differences in thermosensitivity among strains could be interpreted as the result of evolution and processes of adaptation to site-specific environmental conditions. Although carbon content did not differ among strains and cultivation temperatures, nitrogen content tended to increase at higher temperatures and there were differences among strains. A wide variety of asexual variants stably reproducing clonally would be advantageous in selecting elite cultivars for long-term cultivation. Using asexual variants as available resources for elite cultivars provides potential support for increasing the productivity of U. prolifera.

scholarly journals Evaluation of Electric Field and Space Charge Dynamics in Dielectric under DC Voltage with Superimposed Switching Impulse

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1836 ◽  
Author(s):  
Ik-Soo Kwon ◽  
Sun-Jin Kim ◽  
Mansoor Asif ◽  
Bang-Wook Lee
Keyword(s):  
Electric Field ◽  
Space Charge ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Numerical Study ◽  
Numerical Approach ◽  
Dc Voltage ◽  
Charge Dynamics ◽  
Electrical Stress ◽  
Dc Stress

The influx of a switching impulse during DC steady-state operations causes severe electrical stress on the insulation of HVDC cables. Thus, the insulation should be designed to withstand a superimposed switching impulse. All major manufacturers of DC cables perform superimposed switching impulse breakdown tests for prequalification. However, an experimental approach to study space charge dynamics in dielectrics under a switching impulse superposed on DC voltage has not been reported yet. This is because, unlike the DC stress, it is not possible to study the charge dynamics experimentally under complex stresses, such as switching impulse superposition. Hence, in order to predict and investigate the breakdown characteristics, it is necessary to obtain accurate electric field distribution considering space charge dynamics using a numerical approach. Therefore, in this paper, a numerical study on the switching impulse superposition was carried out. The space charge dynamics and its distribution within the dielectric under DC stress were compared with those under a superimposed switching impulse using a bipolar charge transport (BCT) model. In addition, we estimated the effect of a superimposed switching impulse on a DC electric field distribution. It was concluded that the temperature conditions of dielectrics have a significant influence on electric field and space charge dynamics.

Sign in / Sign up

Export Citation Format

Share Document