Results 71 to 80 of about 2,022 (170)

Improving current sharing between parallel varistors

, 2001
Metal oxide varistors are widely used in many power electronics circuits to protect against transient over voltages. Certain applications can be very demanding on the energy handling capability of the varistors.
Ahmed, Mohamed Mostafa Ramadan, Putrus, Ghanim, Ran, Li   +2 more
core  

Thermal Runaway in Metal Oxide Varistors

, 1981
The conditions leading to thermal runaway in metal oxide varistors are discussed in terms of its power dissipation. An equivalent circuit is used to rationalize the similarities and differences between the DC and 60 Hz ac behavior.
Mike E. Potter, Martin A. Seitz, Richard W. Hirthe   +2 more
core   +1 more source

DEVELOPMENT OF SNO2 BASED VARISTORS - ELECTRICAL BEHAVIOR AND PULSE DEGRADATION COMPARATIVELY TO ZNO VARISTORS

, 2010
This work presents the most relevant aspects of the SnO2 based varistors technology and a comparative study of its non linear behavior in relation to ZnO (modified Matsuoka system) varistors.
Longo, E. [UNESP], Bassi, W., Varela, J. A. [UNESP], Bueno, P. R. [UNESP], IEEE, Ramirez, M. A. [UNESP]   +5 more
core  

Kinetics deformation of current-voltage characteristics of the varistor oxide structures due to overcharging of the localized states

Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2014
Prolonged exposure of zinc oxide varistors to the electrical load leads to current-voltage characteristics (CVC) deformation, which is associated with a change in the height and width of the intergranular barriers, which are the main structural element ...
A. S. Tonkoshkur, A. V. Ivanchenko
doaj   +1 more source

The effects of Cu dopant on the microstructure and non-ohmic electrical properties of ZnO varistors

, 2011
The doping effects of Cu on the microstructure and non-ohmic electrical properties of ZnO varistors were studied. Addition of Cu2O can enhance the ZnO grain growth during sintering. The SEM and EDS results revealed that the added Cu mainly distributed in
Fan, Jiwei, Jiao, Zhiqiang, Zhang, Zhenguo, Xiao Peng Li, Liu, Xiangyang, Zhang, Wenjing, Ji Wei Fan, Zhi Qiang Jiao, Xiang Yang Liu, Wen Jing Zhang, Zhen Guo Zhang, Freer, Robert, Poonsuk Poosimma, Robert Freer, Li, Xiaopeng, Poosimma, Poonsuk   +15 more
core   +1 more source

Degradation and recovery of ZnO varistors

, 2006
In the present work it was studied the main aspect that influences on degradation and physical-chemical properties at grain-boundary region of metal oxide varistors and its consequences on microstructure and nonohmic electric properties.
Ramírez, M. A. [UNESP], M. A. Ramírez, Ramírez, M. A., J. A. Valera, M. A. Márquez, Valera, J. A. [UNESP], Bueno, P. R., Bueno, P. R. [UNESP], P. R. Bueno, Valera, J. A., Márquez, M. A.   +10 more
core   +1 more source

Measuring the energy handling capability of metal oxide varistors [PDF]

, 2001
Metal oxide varistors are widely used in many power electronics circuits to protect against transient over voltages. Certain applications are very demanding on the energy handling capability of the varistors.
Putrus, G.A., Ran, L., Penlington, Roger, Ahmed, M. M. R.   +3 more
core  

Influence Mechanism of Micro Grain-boundary Parameters to the Electrical Properties of ZnO Varistor

工程科学与技术
ZnO varistors exhibit excellent nonlinear voltage–current characteristics and substantial energy capacity, enabling them to absorb impulse energy during power system overvoltages and thus protect the electrical equipment.
Pengfei MENG, Jingke GUO, Xiao LEI, Lei WANG, Bingbing ZHANG, Kui MIAO, Jun HU   +6 more
doaj  

Influence of spinel phase composition on ZnO varistors properties

, 1998
The method of directed synthesis of the constituent phases (DSCP) was applied to investigate the influence of spinel phase composition on characteristics of ZnO varistors.
Uskoković, D, Branković, Zorica, Karanović, Ljiljana C., Poleti, Dejan   +3 more
core   +1 more source

PROCESSING AND CHARACTERIZATION OF LOW-VOLTAGE VARISTORS

, 1994
ZnO seed particles and Cr2O3 were used in this study to control the microstructure of ZnO varistors. The seed particles were prepared by adding 1.0 mol % BaO to ZnO. The powder was then calcined at 800-degrees-C for 2 h, pressed into pellets and sintered
Longo, Elson, Cerri, J. A., Steil, M. C., Varela, José Arana   +3 more
core   +3 more sources