Article
Engineering, Electrical & Electronic
Jiaxin Chen, Yang Wu, Kai Wu, Zepeng Lv
Summary: The study modified a PEA device to test charge distribution in epoxy resin at 77 K and found that charges are less active at low temperature, with slower dissipating rate and lower injection quantity compared to the case at 293 K.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Materials Science, Multidisciplinary
L. Xu, Z. Hou, H. Kang
Summary: The proposed nondestructive testing method based on electro-acoustic technique is able to accurately detect internal defects in dielectric materials, with minimal error. The shape and time characteristics of the stress wave can reflect the characteristics of the defects.
EXPERIMENTAL MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Marek Florkowski, Maciej Kuniewski
Summary: This article investigates the effects of nanosecond impulse and step excitation in the pulsed electro-acoustic measurements (PEA) of space charges in high-voltage electrical insulation. Experimental results show that the pulse transition phase plays a critical role in stimulating space-charge vibrations and generating elastic waves. The width of the pulser also affects the signal's magnitude, dispersion, and attenuation.
Article
Engineering, Electrical & Electronic
Hanwen Ren, Siyang Zhao, Jian Mu, Haoyu Gao, Tianrun Qi, Zhiyun Han, Zhihui Li, Qingmin Li
Summary: This paper studies the equivalent transmission line model of the pulsed electro-acoustic (PEA) method and its applications. A reliable equivalent simulation model of the PEA system is developed and verified. The study finds that the acoustic impedance mismatch in the PEA modules can severely affect the amplitude and shape of the measured charge waveforms, and proposes a selection criterion to avoid the superimposition effect of reflected waves.
IET SCIENCE MEASUREMENT & TECHNOLOGY
(2023)
Article
Polymer Science
Minhee Kim, Se-Hee Lee
Summary: The study analyzed the impact of accumulated space charge on electric field distortion and breakdown strength in polymeric insulators in an HVDC environment using a bipolar charge transport model. It was found that temperature gradient accelerates the reduction of breakdown strength, and internal energy imbalance caused by polarity-reversal voltage significantly decreases breakdown strength.
Article
Physics, Multidisciplinary
Juan Qin, Gang Cao, Run Xu, Jing Lin, Hua Meng, Wen-Zhen Wang, Zi-Ye Hong, Jian-Cong Cai, Dong-Mei Li
Summary: ToF transient current method is utilized to study semiconductor transport characteristics, revealing the electric field distribution and hole mobility inside a MAPbI(3) single crystal detector. The inhomogeneous electric field inside the perovskite results in deviation in transit time measurements under direct current and pulsed bias. Positive space charge density increases with bias voltage, providing insights into transport properties of perovskite single crystals.
Article
Engineering, Electrical & Electronic
Mohamad Arnaout, Khaled Chahine, Thierry Paulmier, Denis Payan
Summary: A model-based estimation method called the matrix pencil is proposed in this paper, which can estimate the space-charge distribution in irradiated polymers without the need for a calibration procedure, thus reducing data acquisition and processing times.
JOURNAL OF ELECTROSTATICS
(2021)
Article
Chemistry, Physical
Xin Xu, Connor Carr, Xinqi Chen, Benjamin D. Myers, Ruiyun Huang, Weizi Yuan, Sihyuk Choi, Dezhi Yi, Charudatta Phatak, Sossina M. Haile
Summary: This study reveals the variation in grain boundary properties of polycrystalline ionic materials and the correlation between grain boundary resistance and impurity concentration. The findings suggest that the grain boundary resistance may be caused by impurity-generated space charge effects and driven by the energetics of impurity segregation.
ADVANCED ENERGY MATERIALS
(2021)
Article
Physics, Applied
Penglong He, Bo Zhang, Jinliang He
Summary: This study investigates the characteristics of acoustic waves generated by a divergent electric field and reveals the relationship between the acoustic waves and the surface force, internal Coulomb force, and electrostrictive force. The results show that each component exhibits two opposite peaks in the acoustic wave due to the local distribution of the force, making it challenging to extract space charge information.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Vladislav Yu Khomich, Igor E. Rebrov, Vadim V. Voevodin, Vladimir A. Yamshchikov, Yaroslav E. Zharkov
Summary: This study investigates the influence of various factors on the shape of the ion cloud extracted from a specific discharge setup. Experimental and computer simulation results reveal that the ion charge distribution in the gap volume is non-uniform and that volume charge accumulation occurs at high pulse repetition rates. Computer simulations indicate that the distortion of the ion cloud shape is primarily caused by surface charge deposited on the dielectric barrier.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Qianjin Mu, Wencong He, Chuncai Shan, Shaoke Fu, Shihe Du, Jian Wang, Zhao Wang, Kaixian Li, Chenguo Hu
Summary: A novel blade soft contact TENG (BSC-TENG) is proposed in this study, which achieves high charge density and long-term stable power output through the combination of flexible functional blades and shielded electrodes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Ying Bin Zhu, Mei Yan Liao, Ruo He Yao
Summary: The properties of space charge limited current and induced particle reflection with a time-varying current injection have been investigated using a grid-free numerical approach. It has been found that the limiting current strongly depends on the current frequency, magnitude, and electron emission velocity. The dc component of the limiting current is approximately half of that obtained from the time-independent model in the low-frequency limit.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Electrical & Electronic
Xianhao Fan, Shu Niu, Hanhua Luo, Jizhong Liang, Fang Liu, Wenqiang Li, Weidong Liu, Wensheng Gao, Yulong Huang, Chuanyang Li, Jinliang He
Summary: A highly sensitive detection technique based on photon counting is reported for micro-defects in insulation pull rods. The results demonstrate a strong correlation between photon counts and defect severity. The mechanism behind defect-induced photon counting is explained, and the potential of photon counting in detecting micro-defects and online insulation condition monitoring is verified.
Article
Engineering, Electrical & Electronic
Zepeng Lv, Yuntong Ma, Chen Zhang, Jinyang Peng, Kai Wu, L. A. Dissado
Summary: The study developed a system to measure current and space charge in a dielectric, revealing a complex relationship between current and space charge accumulation. Experimental results on low density polyethylene samples showed that transient currents initially decreased, then increased or peaked, consistent with previous research on space charge limited currents.
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
(2021)
Article
Chemistry, Multidisciplinary
Lianfeng Zhao, Kwangdong Roh, Sara Kacmoli, Khaled Al Kurdi, Xiao Liu, Stephen Barlow, Seth R. Marder, Claire Gmachl, Barry P. Rand
Summary: This study presents high-speed PeLEDs, driven by nanosecond electrical pulses, with improved device design and material considerations. The fast operation of PeLEDs allows access to transient charge carrier dynamics and reveals new electroluminescence quenching pathways. Additionally, integrated DFB gratings enhance directional light emission and forward radiation output.
ADVANCED MATERIALS
(2021)