Results 51 to 60 of about 2,670,785 (225)

Lightning Overvoltage Protection Technologies for High‐Speed Railway Traction Power Supply Systems: Current Status and Future Prospects

High Voltage, Volume 11, Issue 5, Page 1360-1375, October 2026.
ABSTRACT The traction power supply system of high‐speed railways is exposed to complex lightning environments over the long term. Overvoltage generated by direct lightning or induced lightning can propagate along the overhead contact line, traction substations, onboard high‐voltage system and mobile grounding system, thereby threatening equipment ...
Guangning Wu, Yihan Fan, Ye Cao, Xinbo Lv, Yujun Guo, Song Xiao, Huazhi Zhang, Jun Hu, Baoguo Wang, Guoqiang Gao   +9 more
wiley   +1 more source

Chemical Control of Space Charge Barriers and Grain Boundary Resistances in Polycrystalline Ionic Conductors

Advanced Functional Materials, Volume 36, Issue 74, 14 September 2026.
Grain boundaries (GBs) in polycrystalline materials often block charge transport and drive degradation. Using Gd‐doped CeO2 as a model electrolyte used in fuel/electrolysis cells, we developed a core‐shell infiltration method to selectively modify GB chemistry and space charge potential, achieving orders‐of‐magnitude ionic conductivity changes.
Z. Sha, T. Defferriere, C. Gilgenbach, J. M. LeBeau, I. Lubomirsky, H. L. Tuller   +5 more
wiley   +1 more source

Comparative analysis of nonbismuth metal oxide varistor compositions and performance characteristics

Discover Electronics
The persistent reliance on conventional ZnO–Bi₂O₃ varistor systems has increasingly revealed fundamental limitations that constrain their deployment in modern power infrastructure, particularly concerning thermal volatilization, environmental ...
Arash Vaghef-Koodehi, Yaser Bahari
doaj   +1 more source

Aging Effects on PTCR Ceramics: SEM and C‐AFM Analysis of Electrical Conductivity and Domain Structures

International Journal of Applied Ceramic Technology, Volume 23, Issue 4, August 2026.
ABSTRACT This study examines the impact of aging on the electrical and structural properties of positive temperature coefficient of resistance (PTCR) ceramics. The presented study introduces a correlative scanning electron microscopy (SEM)/conductive atomic force microscopy (C‐AFM) approach enabling repeated, site‐specific characterization of ...
Kryštof Koller, Filip Ulč, Patrik Sokola, Veronika Hegrová, Petr Ptáček   +4 more
wiley   +1 more source

Investigation of Limitations in Passive Voltage Clamping-Based Solid-State DC Circuit Breakers

IEEE Open Journal of Power Electronics, 2022
This paper investigates limitations of passive voltage clamping based dc solid-state circuit breakers (SSCBs). There are two major contributions of this paper.
Shuyan Zhao, Reza Kheirollahi, Yao Wang, Hua Zhang, Fei Lu   +4 more
doaj   +1 more source

dv/dt Dependence in metal oxide varistors

Electronics Letters, 1986
A dv/dt dependence has been observed in metal oxide varis-tors during impulse testing. A lossy dielectric model which provides a qualitative explanation of this behaviour can also be used to account for current overshoot.
de Cogan, D., Leesen, M.
openaire   +2 more sources

Strain‐Induced Redistribution of Point Defects in ZnO Nanoparticles

Small Science, Volume 6, Issue 3, March 2026.
Powder compaction generates local strain effects in ZnO nanoparticles. This alters the abundance of intrinsic point defects and impacts the semiconductor's electronic structure. Such changes were analyzed by a combination of spectroscopy and density functional theory calculations and emphasize the importance of strain effects in the design and ...
Korbinian Aicher, Thomas Berger, Antonios Litovoilis, Ulrich Aschauer, Oliver Diwald   +4 more
wiley   +1 more source

Electrical Properties of ZnO-Bi₂O₃ Metal Oxide Heterojunction — A Clue of a Role of Intergranular Layers in ZnO Varistors

, 1981
Zinc Oxide (ZnO) Ceramics-Bismuth Oxide (Bi2O3) Metal Oxide thin film heterojunction made by sputtering technique showed a highly non-Ohmic property. The voltage-current characteristics and the dielectric properties showed dependence on Bi2O3 metal oxide
Kazuo Eda
core   +1 more source

Electro-Thermal Modeling of Metal-Oxide Arrester under Power Frequency Applied Voltages

Energies, 2018
Metal-oxide arresters (MOAs) are used to absorb the electrical energy resulting from overvoltages in power systems. However, temperature rises caused by the absorbed energy can lead to the electrothermal failure of MOAs.
Jiazheng Lu, Pengkang Xie, Zhen Fang, Jianping Hu   +3 more
doaj   +1 more source

Ultra‐Rapid Blacklight Sintering for ZnO‐Based Varistors With Optimized Functional Properties

Journal of the American Ceramic Society, Volume 109, Issue 3, March 2026.
ABSTRACT The increasing demand for energy‐efficient optoelectronic systems has intensified interest in high‐performance ceramic varistors, which are critical components in surge protection applications. In this study, ZnO‐based varistors were fabricated using a novel blacklight sintering (BLS) technique, which employs high‐powered blue light, and were ...
Ahmad Sayyadi‐Shahraki, Michael Scherer, Lukas Porz, Mohammad Maleki Shahraki, Till Frömling   +4 more
wiley   +1 more source