Results 51 to 60 of about 135,374 (222)

Comparative Studies on Degradation of Varistors Subjected to Operation in Surge Arresters and Surge Arrester Counters [PDF]

Archives of Metallurgy and Materials, 2020
The paper presents results of investigation of microstructure and micro-hardness for material of ZnO varistors applied to 110 kV surge arrester and surge arrester counter.
P. Papliński, J. Wańkowicz, H. Śmietanka, P. Ranachowski, Z. Ranachowski, S. Kudela Jr, M. Aleksiejuk   +6 more
doaj   +1 more source

Microstructural Characterization of ZnO Varistors.

Journal of the Japan Society of Powder and Powder Metallurgy, 1995
Two kinds of commercial ZnO system varistors were investigated with relevance to their microstructures. Particularly, face-to-face fracture surfaces were characterized in terms of secondary electron image and backscatterd electron image to clarify the existence of precipitates at the grain-to-grain interface.
Takeda, Shunji, Koumoto, Kunihito, Yanagida, Hiroaki   +2 more
openaire   +2 more sources

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

The Electrical Conductivity of the Lower Mantle From High‐Pressure/High‐Temperature Measurements of Pyrolite and Ten Years of Geomagnetic Observations

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract Electromagnetic sounding coupled with experimental measurements of electrical conductivity (EC) can provide valuable constraints on the thermochemical state of Earth's lower mantle. Here, we report a new set of experimentally determined EC values of pyrolite, a candidate composition of the lower mantle, between 25 and 80 GPa at room ...
Charlotte Trubowitz, Motohiko Murakami, Federico Munch, Alexander Grayver, Christian Liebske, Amir Khan, Nobuyoshi Miyajima, Pinku Saha, Yoshiyuki Okuda, Georg Spiekermann, Luiz Grafulha Morales   +10 more
wiley   +1 more source

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

Effect of Composite Additives on ZnO Varistor Ceramics

, 2011
ZnO-based varistor ceramics were prepared by sintering ZnO powders with minor additives that were synthesized by standard ball milling, high energy ball milling for 10 h, and pyrogenic decomposition of nitrate.
Guo Quan Qi, Jian Feng Zhu, Hai Bo Yang, Fen Wang   +3 more
core   +1 more source

Effect of soda lime silica glass doping on ZnO varistor ceramics: dry milling method

Journal of Asian Ceramic Societies, 2020
There is a lack of reports where dry milling methods have been used in the preparation of varistor based ceramics. Dry milling methods have been demonstrated to be able to produce fine and homogeneous sample powders.
Nur Quratul Aini Ismail, Nor Kamilah Saat, Mohd Hafiz Mohd Zaid   +2 more
doaj   +1 more source

Influence of Fine Crystal Percentage on the Electrical Properties of ZnO Ceramic-Based Varistors

Crystals, 2020
Herein, the effect of nanocrystal percentage in bulk-ZnO varistors was studied. The structure of ZnO nanocrystals was examined using X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM).
Abdullah Aljaafari, Ahmed Sedky
doaj   +1 more source

External Leakage Current Separation to Determine Arrester Condition Due to Contamination

Jurnal Nasional Teknik Elektro, 2023
Leakage current measurements can be used to determine the aging condition of the ZnO arrester. The leakage current that occurs in the arrester is divided into two, namely external and internal leakage currents.
Novizon Novizon, Mondrizal Mondrizal, Darwison Darwison, Aulia Aulia, Tesya Uldira Septiyeni   +4 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