IEEE Organizations related to Metal-oxide Varistors (movs)

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Conferences related to Metal-oxide Varistors (movs)

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2021 IEEE Pulsed Power Conference (PPC)

The Pulsed Power Conference is held on a biannual basis and serves as the principal forum forthe exchange of information on pulsed power technology and engineering.


2020 IEEE Industry Applications Society Annual Meeting

The Annual Meeting is a gathering of experts who work and conduct research in the industrial applications of electrical systems.


2020 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

This conference provides an exchange of technical topics in the fields of Solid State Modulators and Switches, Breakdown and Insulation, Compact Pulsed Power Systems, High Voltage Design, High Power Microwaves, Biological Applications, Analytical Methods and Modeling, and Accelerators.


2020 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMCSI)

This symposium pertains to the field of electromagnetic compatibility.


2020 IEEE Power & Energy Society General Meeting (PESGM)

The Annual IEEE PES General Meeting will bring together over 2900 attendees for technical sessions, administrative sessions, super sessions, poster sessions, student programs, awards ceremonies, committee meetings, tutorials and more


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Periodicals related to Metal-oxide Varistors (movs)

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No periodicals are currently tagged "Metal-oxide Varistors (movs)"


Most published Xplore authors for Metal-oxide Varistors (movs)

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Xplore Articles related to Metal-oxide Varistors (movs)

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Study of degradation by impulse having 4/10µs and 8/20µs waveform for MOVs (metal oxide varistors)

2014 International Conference on Lightning Protection (ICLP), 2014

MOV technology is based on ceramics material science and its surge withstand capability is related to electrical or/and mechanical reasons. In addition, because DC, AC and various wave shapes based on the various standards are applied on MOVs, the degradation or failure analysis is very complicated. Therefore, the continuous study of mechanism of its degradation by surge is crucial. This ...


IEEE Approved Draft Standard for Test Methods and Performance Values of Metal-Oxide Varistor Surge Protective Components

IEEE PC62.33/D4, May 2015, 2015

Test methods and preferred values for metal-oxide varistor (MOV) surge protective components are covered in this standard and have the following main parameter ranges: packaging (leaded disc-type or surface mount), nominal varistor voltage (5 V to 1200 V), 8/20 surge current rating (10 A to 70 kA), and 8/20 clamping voltage (10 V to 3 kV). With appropriate component selection, ...


Nano-enabled metal oxide varistors

IEEE Transactions on Dielectrics and Electrical Insulation, 2009

Zinc oxide based metal oxide varistors (MOV) are widely used electrical surge protection components. The design of modern high power, high-density electronic systems necessitate the need for smaller footprint, higher current density and higher nonlinearity MOVs. Such requirements can no longer be satisfied by commercially available MOVs due to their limited voltage capability, high leakage current and mechanical cracking related ...


Surge Withstand Capability of Parallel-connected Metal Oxide Varistors

2018 34th International Conference on Lightning Protection (ICLP), 2018

Metal oxide varistors (MOVs) composed of multiple MOVs connected in parallel have benefits, including compactness and the potential to realize high surge withstand capability. On the other hand, it is absolutely necessary to control the V-I characteristics of each MOV connected in parallel to ensure uniform current flow between the component MOVs. If this current is not uniform, the component ...


Power dissipation of ZnO-based metal oxide varistors (MOVs) for electronic circuit protection

Proceedings. 7th International Conference on Solid-State and Integrated Circuits Technology, 2004., 2004

Power dissipation in the high-current (upturn) region of the current-voltage characteristic of ZnO-based metal oxide varistors (MOVs) has been observed to be influenced by the ZnO grain resistivity and nonlinearity. Power dissipation lower than 20 kW was observed in samples with lower grain resistivity values (less than 1 /spl Omega/cm) and higher coefficients of nonlinearity (/spl alpha/ above 3.2). High ...


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Educational Resources on Metal-oxide Varistors (movs)

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IEEE-USA E-Books

  • Study of degradation by impulse having 4/10µs and 8/20µs waveform for MOVs (metal oxide varistors)

    MOV technology is based on ceramics material science and its surge withstand capability is related to electrical or/and mechanical reasons. In addition, because DC, AC and various wave shapes based on the various standards are applied on MOVs, the degradation or failure analysis is very complicated. Therefore, the continuous study of mechanism of its degradation by surge is crucial. This study focused on the surge withstands capability of metal oxide various for 4/10μs, 8/20μs waveforms from varistor voltage change point of view. It was found that charge transfer value in an impulse per unit cross section area of MOVs is related to varistor voltage drop and its behaviour is different by waveforms. In order to find the reason, we estimated the impulse current flow distribution by identifying the parts having greater varistor voltage drop by spot electrode measurements and found that steep impulse is easy to flow in edge parts of a MOVs.

  • IEEE Approved Draft Standard for Test Methods and Performance Values of Metal-Oxide Varistor Surge Protective Components

    Test methods and preferred values for metal-oxide varistor (MOV) surge protective components are covered in this standard and have the following main parameter ranges: packaging (leaded disc-type or surface mount), nominal varistor voltage (5 V to 1200 V), 8/20 surge current rating (10 A to 70 kA), and 8/20 clamping voltage (10 V to 3 kV). With appropriate component selection, these components could be used for the overvoltage protection of power and signal systems having continuous ac voltages (2.5 V rms to 750 V rms), steady-state dc voltages (3.3 V to 1000 V), and peak signal feed voltages (3.5 V to 850 V). Information is given on manufacturer type testing used to determine environmental performance and rated values.

  • Nano-enabled metal oxide varistors

    Zinc oxide based metal oxide varistors (MOV) are widely used electrical surge protection components. The design of modern high power, high-density electronic systems necessitate the need for smaller footprint, higher current density and higher nonlinearity MOVs. Such requirements can no longer be satisfied by commercially available MOVs due to their limited voltage capability, high leakage current and mechanical cracking related reliability issues, most of which are associated with the presence of defects and coarse granularity and lack of uniformity in their microstructures. New formulations and processes have been developed to overcome such limitations. This work has developed nano-enabled MOV compositions that can be sintered at relatively lower temperatures than typical commercial MOVs, but with largely improved I-V characteristics due to refined and uniform sub-micron structures. These nano- enabled MOVs show not only high breakdown strength (1.5 kV/mm) with low leakage current, but also a large nonlinear alpha coefficient > 50 at high fields, a measure of the speed of the transition from the insulating to conducting state and the effectiveness of over-voltage protection. A > 10x increase in breakdown strength compared to commercial MOVs, along with much higher nonlinearity, will enable MOV miniaturization, high voltage surge protection, and open up new areas of application.

  • Surge Withstand Capability of Parallel-connected Metal Oxide Varistors

    Metal oxide varistors (MOVs) composed of multiple MOVs connected in parallel have benefits, including compactness and the potential to realize high surge withstand capability. On the other hand, it is absolutely necessary to control the V-I characteristics of each MOV connected in parallel to ensure uniform current flow between the component MOVs. If this current is not uniform, the component MOV having low voltage will puncture and degrade at a lower surge current than expected. In this paper, we have studied the distribution of electric field and current on the surface of a three-parallel MOV using the finite-difference time-domain (FDTD) method. Additionally, real impulse testing was conducted to confirm the surge withstand capability of three- parallel MOV. From the obtained results, we have concluded that the surge withstand capability of the three-parallel MOV is not decreased from the desired 3X individual surge withstand capability if the variation of V1mAvoltage between each MOV component is less than 4%.

  • Power dissipation of ZnO-based metal oxide varistors (MOVs) for electronic circuit protection

    Power dissipation in the high-current (upturn) region of the current-voltage characteristic of ZnO-based metal oxide varistors (MOVs) has been observed to be influenced by the ZnO grain resistivity and nonlinearity. Power dissipation lower than 20 kW was observed in samples with lower grain resistivity values (less than 1 /spl Omega/cm) and higher coefficients of nonlinearity (/spl alpha/ above 3.2). High concentration of intrinsic defects in ZnO powder could be the underlying cause of the higher grain resistivity, lower /spl alpha/ and larger power dissipation.

  • On the use of metal oxide varistors as a snubber circuit in solid-state breakers

    When solid-state switches are used in DC-breaker topologies, the turn-off operation can cause transient over-voltages that might harm the semiconductor itself. The over-voltage is caused by the combination of the very rapid current decrease of a solid-state switch and an undesired stray inductance in the parallel MOV-branch. The authors have proposed a possible solution where a smaller MOV is connected close to the solid-state switch to limit the over- voltage. This way, the over-voltage protection can be separated from the energy absorption task of the MOV. A small scale test set-up has been used to show that the peak voltage across the breaker is fully determined by the inner MOV. It is also shown that the performance can be increased by changing the U-I-characteristics of the outer MOV by adding several components in parallel.

  • Surge withstand capability of metal oxide varistors for 10/350 µ s waveform

    Lightning protection using surge protective devices (SPDs) have an important role for reliability of power delivery in current advanced information technology society. SPDs are categorized by 3 test class (Class I, II and III) according to IEC 61643-11). Especially, because class I SPDs intend to install at the entrance of power line according to IEC 61643-12), it is important how big current SPD withstands. As components of SPD in Low voltage power distribution system, metal oxide varistors (MOVs) and/or spark gaps (GDT) were mainly used. SPDs with MOVs are voltage limiting type and have some merits as follows compared to that with GDT. Capability of cut off the follow current: Lower residual voltage: Quickly response However, from surge withstand capability of the view, it is easy for MOVs to degrade its electrical characteristics by surge current because it translates from surge energy to heat itself. This point is a drawback for MOVs. This study describes the degradation mechanism of MOVs by surge impulses and the approaches for high and stable surge withstand capability through 10/350 μs impulse test results.

  • Effect of electro-thermally induced degradation on the capacitance of metal oxide varistors

    In this study, changes in the capacitance of MOV-based arresters resulting from thermal stresses are analysed. Low-voltage MOV samples are artificially degraded at different thermal stresses, while the simultaneously applied ac field was kept constant. Prior to ANOVA being applied, the change in capacitance measured at room temperature, before and after degradation process, is tested for compliance with normality using Anderson-Darling test. Results show significant reduction in capacitance after electro-thermal degradation.

  • Repetitive Impulse Withstand Performance of Metal–Oxide Varistors

    This study focuses on the relationship between test current waveforms and impulse withstand capability of metal- oxide varistors (MOVs) (withstand energy, current density, and the number of withstand shots) in repetitive impulse application and discusses the mechanical and electrical failure mechanisms. The performance and relationship of withstand energy and withstand shots for conventional 2-ms rectangular waveform, 4/10-μs, and newly introduced 10/350-μs impulses are investigated. Notably, the 10/350-μs waveform has aspects of both steep rise impulse and long duration impulse. In addition, the varistor voltage change after repetitive impulse applications for 10/350-μs and 4/10-μs waveforms is investigated. There is no direct relationship between varistor voltage drop and repetitive withstand shots. However, VIm Aand V0.01 m Achanges indicate the degree of MOV damage caused by the impulses and are important factors to monitor progressive damage. Based on these findings, optimal MOV design is discussed.

  • Assessment Modeling of Series Capacitors Protected by Metal Oxide Varistors in Power System Studies

    This paper presents assessments of two models for MOV protected series capacitors. The first model is empirical and the second is analytically developed by solving the nonlinear system and applying the describing function (DF). The models are assets in short-circuit and transient stability studies. For short-circuit analysis, symmetrical and unsymmetrical faults are considered on simplified circuits using a compensation technique. For the transient stability analysis, the model is evaluated on simplified circuits with a single machine system and an infinite bus. The evaluation of the model is done using an equal area criterion and numerical solutions of nonlinear differential equations. Comparing the model with the results obtained from electromagnetic transient simulations and the empirical model proves the accuracy and flexibility of the DF model.



Standards related to Metal-oxide Varistors (movs)

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IEEE Guide for the Application of Component Surge-Protective Devices for Use in Low-Voltage [Equal to or Less than 1000 V (ac) Or 1200 V (dc)] Circuits

This guide covers the application of component air gaps, gas tubes, MOVs, and avalanche junction semiconductor surge-protective devices for use within surge protectors, equipment, or systems involving lowvoltage power, data, communication, and/or signaling circuits. This guide is intended to be used with, or to complement, the related documents referred to in 2.1.


IEEE Guide for the Application of Surge Protective Devices for Low Voltage (1000 Volts or Less) AC Power Circuits


IEEE Guide on Interactions Between Power System Disturbances and Surge Protective Devices

This guide applies to surge-protective devices (SPDs) manufactured to be connected to 50 Hz or 60 Hz ac power circuits rated at 100–1000 V rms. This guide describes the effects on SPDs of power system disturbances occurring in these low-voltage ac power circuits. The disturbances are not limited to surges. The effects of the presence and operation of SPDs on ...



Jobs related to Metal-oxide Varistors (movs)

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