Results 21 to 30 of about 416 (167)

Analysis of MOA Damage Mechanism Under Multiple Strokes

Applied Sciences
Accident records from the actual operation of metal oxide arresters (MOAs) indicate that even MOA products that have passed standard tests still suffer from frequent damage.
Tao Yuan, Dengke Gao, Siyu Chen, Zhenjie Zheng   +3 more
doaj   +1 more source

Two basic ways to realise DC circuit breakers

The Journal of Engineering, 2019
As a key element of the DC grid, the technology of DC circuit breakers (DCCBs) still have difficulty to be widely used due to its large cost and volume. This paper studies the basic principle and its realisation methods for DCCBs.
Zheng Xu, Huangqing Xiao, Huangqing Xiao, Yuzhe Xu   +3 more
doaj   +1 more source

Electrical properties of ZnO varistors prepared by direct mixing of constituent phases [PDF]

Science of Sintering, 2006
Varistor samples containing different amounts of constituent phases were prepared by direct mixing of constituent phases. Detailed electrical characterization was performed to explain the influence of minor phases (spinel and intergranular phases) on ...
Žunić M., Branković Z., Branković G.
doaj   +1 more source

Study on temperature rise prediction of ZnO varistors under multiple lightning strikes based on BP neural network and microscopic

High Temperature Materials and Processes
ZnO varistors are widely used in the field of lightning protection. After being struck by lightning, ZnO varistors absorb heat, which can lead to temperature rise and even damage, posing a serious safety threat to electrical safety.
Li Chunying, Zhang Chunlong, Lv Qing
doaj   +1 more source

Data-Driven Matching Methodology for Enhanced MOV Current Sharing in DC Solid-State Circuit Breakers

IEEE Open Journal of the Industrial Electronics Society
Metal oxide varistors (MOVs) are widely used as the energy absorption branch in DC solid-state circuit breakers (SSCBs), but reliable operation requires predictable current and energy sharing among paralleled MOV discs. This article proposes a low-effort,
Navid Hadifar, Shuyan Zhao, Inder Vedula, Lakshmi Ravi   +3 more
doaj   +1 more source

The Role of Polypyrrole in Electrical Properties of ZnO-Polymer Composite Varistors [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2017
Composite films on the base of ZnO with different weight percentages of polypyrrole have been prepared using the hot pressing method and their current-voltage characteristics have been studied. Results show that the films have nonlinear varistor behavior
Nasim Asaadi, Mojtaba Parhizkar, Sajedeh Mohammadi Aref, Hassan Bidadi   +3 more
doaj  

Caracterização elétrica de blocos varistores à base de SnO2 Electrical characteristics of SnO2-based varistor blocks

Cerâmica, 2012
Neste trabalho foi realizado um estudo das propriedades elétricas de blocos varistores à base de SnO2. Foram avaliadas a não linearidade destas cerâmicas por meio da caracterização tensão-corrente, bem como a altura, largura e os portadores de cargas por
R. L. Brito, P. A. P. Pessôa, J. S. Vasconcelos, L. P. S. dos Santos, J. H. G. Rangel, E. Longo, V. C. de Sousa, M. A. Ramirez, M. M. Oliveira   +8 more
doaj   +1 more source

A modelling approach to describe the DC current-voltage behaviour of low-voltage zinc oxide varistors

Open Ceramics, 2021
Zinc oxide varistors are among the most important surge arresters. The current-voltage (I–V) behaviour of these devices can be approximated by a model of electrical networks of grain boundaries arranged in 3D space, where nonlinear resistors mimic the ...
Benjamin Kaufmann, Thomas Billovits, Markus Kratzer, Christian Teichert, Peter Supancic   +4 more
doaj   +1 more source

Control of Varistor Voltage by Grain-size Control of Bi-added ZnO Varistors

IOP Conference Series: Materials Science and Engineering, 2011
Relationship between the grain size of ZnO and the amounts of Bi and Sb for Bi-Ba-Sb-Co-Mn-added ZnO was investigated. The amount of Bi at which the grain size of ZnO became the maximum shifted to the notably larger one by adding small amount of Sb such as 0.01 mol%.
Fukumori, Ai, Kubota, Atsuko, Sato, Yuuki, Yoshikado, Shinzo   +3 more
openaire   +1 more source

Influência de dopantes doadores na degradação do varistor à base de SnO2 e o efeito do oxigênio pós-degradação nfluence of donor dopants on the degradation of SnO2 -based varistors and the effect of the oxygen post-degradation

Cerâmica, 2006
A degradação elétrica de varistores à base de SnO2 foi estudada e verificou-se que na temperatura de 220 ºC ocorreu a degradação do material. Suas características foram recuperadas quando tratadas em atmosfera de O2, o que mostra que esta atmosfera é ...
M. M. Oliveira, J. H. G. Rangel, V. C. de Sousa, E. R. Leite, E. Longo, P. R. Bueno, J. A. Varela   +6 more
doaj   +1 more source