Results 181 to 190 of about 10,701 (258)

Effects of addition of chromium and/or nickel oxides on the electrical characteristics of yttrium oxide-doped high-voltage zinc oxide varistors

, 2021
The effects of Cr2O3 and/or NiO addition to Y2O3-doped Bi-based high-voltage ZnO varistors were investigated, including crystal structure and interface states analysis.
Yu. Zheng, M. Fujimoto, Y. Sato, S. Yoshikado   +3 more
semanticscholar   +1 more source

Varistor piezotronics: Mechanically tuned conductivity in varistors

Journal of Applied Physics, 2015
The piezoelectric effect of ZnO has been investigated recently with the goal to modify metal/semiconductor Schottky-barriers and p-n-junctions by application of mechanical stress. This research area called “piezotronics” is so far focused on nano structured ZnO wires.
Raschid Baraki, Nikola Novak, Michael Hofstätter, Peter Supancic, Jürgen Rödel, Till Frömling   +5 more
openaire   +1 more source

Electrothermal and Overload Performance of Metal-Oxide Varistors

IEEE Transactions on Power Delivery, 2020
The energy absorption capability of metal-oxide varistors, decidedly influenced by the electrothermal processes occurring within their microstructures, is a vital parameter for the effective surge protection. This paper proposes a numerical model for the
Zumret Topčagić, Miha Mlakar, T. Tsovilis   +2 more
semanticscholar   +1 more source

Degradation phenomena of ZnO varistors

Physica Status Solidi (a), 1981
The dc degradation behaviour of ZnO varistors as a function of the variables current, temperature, and time is investigated. The degradation rate is phenomenologically presented by an equation reflecting the observed aging behaviour in dependence on the influencing variables.
W. Moldenhauer, K. -H. Bäther, W. Brückner, D. Hinz, D. Bühling   +4 more
openaire   +1 more source

Improving electrical properties of ZnO–Bi2O3–Sb2O3–MnO2 varistors by doping with pre-synthesized Bi–Si–O phase

, 2020
The electric properties and microstructure of ZnO -Bi2O3– Sb2O3– MnO2 (ZBSM) varistor ceramics as a function of pre-synthesized mixture of 6Bi2O3 SiO2 (Bi–Si–O) were investigated.
Fangfang Cui, Zhijun Xu, R. Chu, Guorong Li   +3 more
semanticscholar   +1 more source

Origin of ZnO Varistor

Journal of the American Ceramic Society, 1987
The varistor properties were examined in porous ZnO. The sample used contained no dopants such as Bi 2 O 3 or Pr 6 O 11 , which are usually considered to be useful in ...
Satoru Fujitsu, Hiroshi Toyoda, Hiroaki Yanagida   +2 more
openaire   +1 more source

Modular Design Methodology of DC Breaker Based on Discrete Metal Oxide Varistors With Series Power Electronic Devices for HVdc Application

IEEE transactions on industrial electronics (1982. Print), 2019
Different from the continuous-switching behavior of series power electronic devices in converters, the single-switching attribute of dc circuit breakers (DCBs) provides opportunities to integrate metal oxide varistors (MOVs), balancing circuits, and ...
Xiangyu Zhang, Zhanqing Yu, Zhengyu Chen, Yulong Huang, Biao Zhao, R. Zeng   +5 more
semanticscholar   +1 more source

Improving the protective effect of surge arresters by optimizing the electrical property of ZnO varistors

, 2020
In the present research, we studied ZnO varistors having multiple dopants and optimized their microstructure and electrical properties by tailoring the sintering process.
Pengfei Meng, Chao Yuan, Heng Xu, Shuai Wan, Qingyun Xie, Jimou He, Hongfeng Zhao, Jun Hu, Jinliang He   +8 more
semanticscholar   +1 more source

Impulse current withstanding capability of ZnO varistors with influence of varistor size

IEEJ Transactions on Electrical and Electronic Engineering, 2019
Through injecting 8/20 and 30/60 μs impulse currents to five kinds of ZnO varistors, the influence of the varistor size on the single impulse current withstanding capability of a ZnO varistor is investigated in this article. A comprehensive damage criterion of a varistor consisting of three aspects, namely, mechanical failure by visual inspection ...
Jianguo Wang, Linmao Mei, Wanlu Su, Xu Wang, Mi Zhou, Yadong Fan   +5 more
openaire   +1 more source

New varistor material

Journal of Applied Physics, 1988
A composite varistor material containing silicon carbide, a conductor, and an insulator has been developed. The material has rubberlike flexibility and is easily formed. A higher leakage resistivity (∼1012 Ω cm) and greater nonlinearity (∼10) than for silicon carbide varistors permit the material to be used as a gapless surge suppressor.
F. A. Modine, H. M. Hyatt
openaire   +1 more source