Results 1 to 10 of about 6,259 (210)

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

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

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   +1 more source

Description of space charge transport in oil‐paper insulation using adaptive time‐stepping transient upstream finite element method

High Voltage, 2022
The charge transport and accumulation in oil–paper can cause the insulation degradation. So far, the most widely used model to simulate space charge transport and accumulation is the bipolar charge transport (BCT) model, which can well simulate the space
Jiefeng Liu, Mingchen Shi, Yiyi Zhang, Bing Gao, Wei Zhang, Shuo Liang   +5 more
doaj   +1 more source

Preventing Space Charge Accumulation by Incorporating Electrets

Advanced Materials Interfaces, 2023
Space charge accumulates near electrodes in insulating materials under high voltage direct current. Electric stress created by charge accumulation distorts electric field, reduces the remaining useful life of insulating materials, and decreases partial ...
Pradip Chandra Saha, Omar Faruqe, Farhina Haque, Chanyeop Park   +3 more
doaj   +1 more source

Simulation of Influence of DC Pre-Stress on Space-Charge Characteristics of Cross-Linked Polyethylene in Inhomogeneous Field

IEEE Access, 2020
Space charge is one of the main causes of electrical tree initiation in high-voltage cable insulation. To investigate the influence of DC pre-stress on the space-charge distribution of cross-linked polyethylene (XLPE), a two-dimensional needle-plate ...
Hechen Liu, Xiaobin Xu, Yun-Peng Liu, Shaoxin Meng, Zhanpeng Guo, Mingjia Zhang   +5 more
doaj   +1 more source

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   +1 more source

Space Charge Accumulation at Material Interfaces in HVDC Cable Insulation Part II—Simulations of Charge Transport

Energies, 2020
Extruded high voltage direct current (HVDC) cable systems contain interfaces with poorly understood microscopic properties, particularly surface roughness.
Espen Doedens, E. Markus Jarvid, Raphaël Guffond, Yuriy V. Serdyuk   +3 more
doaj   +1 more source

Numerical Simulation on Charge Transport and DC Breakdown in Polyethylene-Based Micro-h-BN/Nano-SiO₂ with Filler Orientation Dependent Trap Energy

Energies, 2021
In order to improve the thermal conductivity and the insulation properties of polyethylene (PE) used as cable insulation under DC stress, hexagonal boron nitride (h-BN) and inorganic particles have been considered as micro-filler and nano-filler ...
Xuri Xu, Yu Gao, Jing Li, Zheng Song, Huicun Zhao, Tao Han   +5 more
doaj   +1 more source