Results 211 to 220 of about 395,154 (260)

Low-temperature ac properties of metal-oxide varistors

Journal of Applied Physics, 1978
Low-temperature (3.5<T<77 °K) measurements of the dielectric constant and dissipation of ZnO ceramic varistors are presented for frequencies f in the range 30<f<105 Hz. A loss peak and dispersion in ε observed at 4 °K are identified as resulting from the two-phase structure of the ZnO varistor (Maxwell-Wagner model). We find
Lionel M. Levinson, H. R. Philipp
openaire   +1 more source

Nano-Enabled Metal Oxide Varistors for Surge Protection

2008 IEEE International Power Modulators and High-Voltage Conference, 2008
Commercial metal oxide varistor (MOV) devices provide a combination of high voltage, peak current, pulse energy absorption, and fast response speed. The non-uniformity and defects, however, may lead to relatively low voltage and energy dissipation, high leakage, low reliability and mechanical cracking.
Daniel Tan, Karim Younsi, Yingneng Zhou, Yang Cao, Patricia Irwin   +4 more
openaire   +1 more source

Testing Metal–Oxide Varistors for HVDC Breaker Application

IEEE Transactions on Power Delivery, 2019
There is growing interest in changing the power grid infrastructure. It is increasingly important to transport a large amount of renewable energy over long distances. To minimize losses, meshed dc-grids are needed but require the development of dc circuit breakers. Without it, a meshed grid cannot be operated. Actually different concepts of dc breakers
Maike Broker, Volker Hinrichsen
openaire   +1 more source

Investigation of various models for metal oxide varistors

Journal of Electronic Materials, 1976
A new type of voltage dependent resistors (varistors), based on zinc oxide ceramics with several other metal oxides as additives, has recently been investigated. The microstructure of these varistors consists of ZnO grains surrounded by thin insulating metal oxide barriers.
J. Bernasconi, H. P. Klein, B. Knecht, S. Strässler   +3 more
openaire   +1 more source

Development of metal oxide varistor element for power systems

Proceedings of IEEE International Symposium on Industrial Electronics, 2002
A highly nonlinear arrester can improve the insulation coordination of electrical substations and reduce the basic impulse level of power systems. Metal oxide varistors with zinc oxide as one of their constituents are used as advanced protective devices for power systems against transient overvoltages.
S.N. Roy, C.K. Roy, P.K. Bhattacharya, T.K. Gangopadhyay   +3 more
openaire   +1 more source

Failure Analysis of Zinc Oxide Varistor under Multiple Lightning Strikes

Journal of Physics: Conference Series
Metal oxide arresters (MOAs) with zinc oxide varistor ceramics as core components serve as critical overvoltage protection devices in power systems. However, multiple lightning strikes can accelerate the aging rate of zinc oxide varistors, reduce their ...
Bowen Wang, Zhiyao Fu, Xiang Zhou, Jiantao Long, Xin Shi, Tianyu Lin   +5 more
semanticscholar   +1 more source

Metal oxide varistor action -a homojunction breakdown mechanism

Applications of Surface Science, 1978
Abstract The metal oxide varistor action has been localized in the vicinity of directly touching ZnO grains, where no heterolayer is detected. Two separable diodes connected back to back are assumed to be formed by a finite local distribution of compensating states extending from the grain boundary into the ZnO grain.
openaire   +1 more source

An Effective Approximate Mathematical Expression for Non-Linear Resistance Characteristics of Metal Oxide Elements

IEEE transactions on electromagnetic compatibility (Print)
A metal oxide varistor (MOV), manufactured from a blend of zinc oxide and other metal oxides, undergoes changes in resistance or resistivity depending on changes in applied voltage or electric field strength.
P. Yutthagowith, Yoshihiro Baba
semanticscholar   +1 more source

Designing a Platform to Evaluate Metal Oxide Varistors for DC Circuit Breaker Applications

Electrical Insulation Conference
Design of a metal oxide varistor (MOV) evaluation platform was introduced and implemented in this work. The key challenges included mimicking critical features of dc power grid, aging the MOV samples at a desired speed under desired conditions, and ...
Yang Liu, Z. Zhang, Kayla Y. Chuong, Zhiyang Jin, Lauren M. Garten, Lukas Graber   +5 more
semanticscholar   +1 more source

Der Metall‐Oxid‐Varistor (MOV)

Physik in unserer Zeit, 1986
Elmar Ziegler, Reinhard Helbig
openaire   +1 more source