Results 1 to 10 of about 6,894 (143)

Research on Surface Charge Migration Characteristics of Two-Layered Polymer Film Based on Bipolar Charge Transport Model

Energies
A cable accessory is a critical component in constructing high-voltage direct current (HVDC) power grids, and it is typically composed of multiple materials. Due to the discontinuity of the insulation medium, it is prone to failure. This study focuses on
Yuqi Liu, Xinjing Cai
doaj   +4 more sources

Modeling of space charge dynamics in polyethylene under AC stress based on bipolar charge transport model

Materials Research Express, 2020
Space charge dynamics under AC stress is of importance as a majority of high voltage cables are under AC stress, and space charge is the driving mechanism of dielectric degradation under these conditions.
Xinjing Cai, Xin Lin, Jianli Yu, Zhiwei Lu   +3 more
doaj   +2 more sources

Improved space charge transport model in bi-layer dielectrics—considering carrier dynamic equilibrium

High Voltage, 2020
The Maxwell–Wagner model and bipolar charge transport model both aim at describing the charge transport behaviours in dielectrics. The Maxwell–Wagner model performs well in calculating the polarisation current and electric field distribution, but it is ...
Hucheng Liang, Boxue Du, Jin Li, Hang Yao, Hang Yao, Zehua Wang   +5 more
doaj   +3 more sources

Electrode-Geometry Control of Normal Electric-Field Distributions and Electrostatic Loading on Sessile-Droplet Interfaces: A Finite-Difference Study with a Finite-Element Cross-Check and Surrogate-Assisted Design Exploration [PDF]

Micromachines
Electrohydrodynamic emission from a sessile droplet depends on a coupled balance among electric traction, capillarity, gravity, charge transport and liquid motion.
Fahad Sulaiman Obaid, Muhammed Anaz Khan
doaj   +2 more sources

Self-powered dual-electrode hydrogen production using a composite ion exchange membrane [PDF]

Nature Communications
The electro-oxidation of formaldehyde at low potential with anodic hydrogen evolution offers an energy-saving way for hydrogen production. Coupling this reaction in an acidic catholyte with an alkaline anolyte within an acid-alkali hybrid electrochemical
Haoyu Yin, Chenghan Xie, Yunbo Dai, Ziming Cao, Shun Ao, Wenjia Wu, Zongyao Zhou, Jun Ma, Bruce E. Logan, Zhongbiao Wu, Le Shi   +10 more
doaj   +2 more sources

Modified Charge Transport Model Under High-Frequency Unipolar Square Wave Voltage

Frontiers in Materials, 2022
As the main insulation material of the power electronic transformer (PET), polyimide (PI) is easy to accumulate space charge under the continuous high-frequency pulse voltage, which will threaten the operation of PET and cause electric field distortion ...
Jianxiang Xie, Shen Yan, Mingchen Shi, Yiyi Zhang, Jiefeng Liu   +4 more
doaj   +1 more source

Models of bipolar charge transport in polyethylene [PDF]

Journal of Applied Physics, 2006
We introduce and develop two bipolar transport models which are based on appreciably different physical assumptions regarding the distribution function in the energy levels of trap states. In the first model, conduction is described by an effective mobility of the carriers and the accumulation of stored space charge is taken into account through a ...
Boufayed, F., Teyssedre, G., Laurent, C., Le Roy, Séverine, Dissado, L., Ségur, P., Montanari, G.   +6 more
openaire   +4 more sources

Study on space charge accumulation characteristics of 320 kV cross-linked polyethylene cable joints

Polymers and Polymer Composites, 2023
High-Voltage Direct Current (HVDC) cable accessories are the key equipment to connect HVDC cables, and also the weak link in the cable system. In order to investigate the transport characteristics of space charge in cable joints, a two-dimensional ...
Yuqi Liu, Xinjing Cai, Dan Zhang
doaj   +1 more source

Effect of multi‐factors on heterocharges for oil‐impregnated paper in converter transformer using modified charge transport model

IET Generation, Transmission & Distribution, 2021
The heterocharge accumulated in the oil‐paper insulation system of the converter transformer will enhance the local electric field and cause insulation deterioration. Numerical simulation is an effective method to analyze heterocharge.
Shen Yan, Jiefeng Liu, Xianhao Fan, Yiyi Zhang, Mingchen Shi, Heng Zhang   +5 more
doaj   +1 more source

Effect of DC Pre-stress on Space Charge and Electrical Tree in XLPE with Needle-Plate Electrodes

Zhongguo dianli, 2021
Space charge is one of the main factors that affect the electrical tree characteristics of HVDC cable insulation. Based on the bipolar charge transport model, this paper simulates the space charge distribution characteristics of the two-dimensional ...
Xiaobin XU, Aijing LIU, Yanjie LE, Hechen LIU, Zhanpeng GUO, Yunpeng LIU   +5 more
doaj   +1 more source